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TI-2021-05514 Aliases CVE-2021-22555

Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE

Priority CRITICAL 95Exploited in the wildCWE-787Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 42 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space

Why it matters now

Exploitation Active In CISA KEV since 2025-10-06CISA due date 2025-10-27
EPSS 0.78684 99th percentileScored 2026-11-07
Public exploit Yes 5 exploit referencesTagged by NVD
Fix Partial Red Hat: 21 advisoriesRed Hat: 42 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Linux Kernel2.6.19-rc1 and later—No fix listedCNA
  • Linux Kernel Vendor— Affected 2.6.19-rc1 and later Fixed in — No fix listed CNA

CPE configurations NVD · 36

CPEVersionsRoleVendor
cpe:2.3:o:netapp:c400_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:c400:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:c250_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:c250:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
  • cpe:2.3:o:netapp:c400_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:c400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:c250_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:c250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Show 26 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.19 to before 4.4.267; 4.5 to before 4.9.267; 4.10 to before 4.14.231; 4.15 to before 4.19.188; 4.20 to before 5.4.113; 5.5 to before 5.10.31; 5.11 to before 5.12VulnerableLinux
cpe:2.3:o:broadcom:fabric_operating_system:-:*:*:*:*:*:*:*not specified by NVDVulnerableBroadcom
cpe:2.3:o:netapp:fas_8300_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:fas_8300:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:fas_8700_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:fas_8700:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:aff_a400_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:aff_a400:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:aff_a250:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:aff_500f:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h610c_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h610c:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h610s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h615c_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h615c:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:solidfire_baseboard_management_controller:*:*:*:*:*:*:*:*all versionsVulnerableNetApp
  • cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.19 to before 4.4.267; 4.5 to before 4.9.267; 4.10 to before 4.14.231; 4.15 to before 4.19.188; 4.20 to before 5.4.113; 5.5 to before 5.10.31; 5.11 to before 5.12 Vulnerable ·Linux
  • cpe:2.3:o:broadcom:fabric_operating_system:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Broadcom
  • cpe:2.3:o:netapp:fas_8300_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:fas_8300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:fas_8700_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:fas_8700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:aff_a400_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:aff_a400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:aff_a250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:aff_500f:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h610c_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h610c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h610s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h615c_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h615c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:solidfire_baseboard_management_controller:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·NetApp

Remediation

Red Hat 21 advisories

  • RHSA-2025:17733 Released 2025-10-10 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) kernel-2.6.32-754.58.1.el6, kernel-abi-whitelists-2.6.32-754.58.1.el6, kernel-debug-2.6.32-754.58.1.el6 +7
    • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) python-perf-2.6.32-754.58.1.el6
  • RHSA-2021:3812 Released 2021-10-12 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) bpftool-3.10.0-957.84.1.el7, kernel-3.10.0-957.84.1.el7, kernel-abi-whitelists-3.10.0-957.84.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kernel-3.10.0-957.84.1.el7, kernel-abi-whitelists-3.10.0-957.84.1.el7, kernel-bootwrapper-3.10.0-957.84.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.84.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debug-devel-3.10.0-957.84.1.el7, kernel-tools-libs-devel-3.10.0-957.84.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.84.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.6) bpftool-3.10.0-957.84.1.el7, kernel-3.10.0-957.84.1.el7, kernel-abi-whitelists-3.10.0-957.84.1.el7 +8
  • RHSA-2021:3814 Released 2021-10-12 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kpatch-patch-3_10_0-957_61_1-1-6.el7, kpatch-patch-3_10_0-957_61_2-1-6.el7, kpatch-patch-3_10_0-957_62_1-1-6.el7 +7
Show 18 more Red Hat advisories
  • RHSA-2021:3725 Released 2021-10-05 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.94.1.el7, kernel-abi-whitelists-3.10.0-693.94.1.el7, kernel-debug-3.10.0-693.94.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.94.1.el7
  • RHSA-2021:3523 Released 2021-09-14 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.7) kpatch-patch-3_10_0-1062_36_1-1-5.el7, kpatch-patch-3_10_0-1062_37_1-1-5.el7, kpatch-patch-3_10_0-1062_40_1-1-5.el7 +6
  • RHSA-2021:3522 Released 2021-09-14 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +9
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debug-devel-3.10.0-1062.56.1.el7, kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
  • RHSA-2021:3477 Released 2021-09-09 · Red Hat rating Important
    RHV-H security update (redhat-virtualization-host) 4.3.18
    • RHEL 7-based RHEV-H for RHEV 4 (build requirements) redhat-virtualization-host-4.3.18-20210903.0.el7_9, redhat-virtualization-host-image-update-4.3.18-20210903.0.el7_9
    • Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host-4.3.18-20210903.0.el7_9, redhat-virtualization-host-image-update-4.3.18-20210903.0.el7_9
  • RHSA-2021:3399 Released 2021-08-31 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.2) kernel-3.10.0-327.100.1.el7, kernel-abi-whitelists-3.10.0-327.100.1.el7, kernel-debug-3.10.0-327.100.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-tools-libs-devel-3.10.0-327.100.1.el7
  • RHSA-2021:3381 Released 2021-08-31 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1160-1-8.el7, kpatch-patch-3_10_0-1160_11_1-1-7.el7, kpatch-patch-3_10_0-1160_15_2-1-7.el7 +8
  • RHSA-2021:3363 Released 2021-08-31 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.64.1.el8_2
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.64.1.el8_2, kernel-4.18.0-193.64.1.el8_2, kernel-abi-whitelists-4.18.0-193.64.1.el8_2 +19
  • RHSA-2021:3327 Released 2021-08-31 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.41.1.el7, kernel-3.10.0-1160.41.1.el7, kernel-abi-whitelists-3.10.0-1160.41.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.41.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.41.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.41.1.el7, kernel-3.10.0-1160.41.1.el7, kernel-abi-whitelists-3.10.0-1160.41.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.41.1.el7, kernel-tools-libs-devel-3.10.0-1160.41.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.41.1.el7, kernel-3.10.0-1160.41.1.el7, kernel-abi-whitelists-3.10.0-1160.41.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.41.1.el7
  • RHSA-2021:3328 Released 2021-08-31 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7 +7
  • RHSA-2021:3380 Released 2021-08-31 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) kpatch-patch-4_18_0-193_19_1-1-11.el8_2, kpatch-patch-4_18_0-193_28_1-1-9.el8_2, kpatch-patch-4_18_0-193_29_1-1-9.el8_2 +8
  • RHSA-2021:3375 Released 2021-08-31 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-4.18.0-193.64.1.rt13.115.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-4.18.0-193.64.1.rt13.115.el8_2 +9
  • RHSA-2021:3321 Released 2021-08-31 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.3) kernel-3.10.0-514.92.1.el7, kernel-abi-whitelists-3.10.0-514.92.1.el7, kernel-debug-3.10.0-514.92.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-tools-libs-devel-3.10.0-514.92.1.el7
  • RHSA-2021:3235 Released 2021-08-19 · Red Hat rating Important
    Red Hat Virtualization Host security and bug fix update [ovirt-4.4.7]
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.4.7-20210804.0.el8_4, redhat-virtualization-host-image-update-4.4.7-20210804.0.el8_4
  • RHSA-2021:3173 Released 2021-08-17 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-tools-libs-devel-4.18.0-147.52.1.el8_1
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) bpftool-4.18.0-147.52.1.el8_1, kernel-4.18.0-147.52.1.el8_1, kernel-abi-whitelists-4.18.0-147.52.1.el8_1 +19
  • RHSA-2021:3181 Released 2021-08-17 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) kpatch-patch-4_18_0-147_27_1-1-12.el8_1, kpatch-patch-4_18_0-147_32_1-1-10.el8_1, kpatch-patch-4_18_0-147_34_1-1-10.el8_1 +6
  • RHSA-2021:3057 Released 2021-08-10 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-305.12.1.el8_4
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-305.12.1.el8_4, kernel-4.18.0-305.12.1.el8_4, kernel-abi-stablelists-4.18.0-305.12.1.el8_4 +19
  • RHSA-2021:3088 Released 2021-08-10 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-305.12.1.rt7.84.el8_4, kernel-rt-core-4.18.0-305.12.1.rt7.84.el8_4, kernel-rt-debug-4.18.0-305.12.1.rt7.84.el8_4 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-305.12.1.rt7.84.el8_4, kernel-rt-core-4.18.0-305.12.1.rt7.84.el8_4, kernel-rt-debug-4.18.0-305.12.1.rt7.84.el8_4 +9
  • RHSA-2021:3044 Released 2021-08-10 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-305-1-4.el8, kpatch-patch-4_18_0-305_10_2-1-1.el8_4, kpatch-patch-4_18_0-305_3_1-1-3.el8_4 +1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
RHEL 7-based RHEV-H for RHEV 4 (build requirements)Fixed RHSA-2021:3477
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:3057
Red Hat CodeReady Linux Builder EUS (v. 8.1)Fixed RHSA-2021:3173
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2021:3363
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:3044, RHSA-2021:3057
Red Hat Enterprise Linux BaseOS EUS (v. 8.1)Fixed RHSA-2021:3173, RHSA-2021:3181
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2021:3363, RHSA-2021:3380
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:3088
Red Hat Enterprise Linux Real Time EUS (v. 8.2)Fixed RHSA-2021:3375
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:3088
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2)Fixed RHSA-2021:3375
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:3327, RHSA-2021:3381
Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)Fixed RHSA-2025:17733
Red Hat Enterprise Linux Server AUS (v. 7.2)Fixed RHSA-2021:3399
Red Hat Enterprise Linux Server AUS (v. 7.3)Fixed RHSA-2021:3321
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2021:3725
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2021:3812
Red Hat Enterprise Linux Server AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2021:3812, RHSA-2021:3814
Red Hat Enterprise Linux Server E4S (v. 7.7)Fixed RHSA-2021:3522, RHSA-2021:3523
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)Fixed RHSA-2025:17733
Red Hat Enterprise Linux Server Optional AUS (v. 7.2)Fixed RHSA-2021:3399
Red Hat Enterprise Linux Server Optional AUS (v. 7.3)Fixed RHSA-2021:3321
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2021:3725
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2021:3812
Red Hat Enterprise Linux Server Optional AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2021:3812
Red Hat Enterprise Linux Server Optional E4S (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2021:3812
Red Hat Enterprise Linux Server Optional TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2021:3812
Red Hat Enterprise Linux Server TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:3327
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2021:3328
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2021:3328
Red Hat Virtualization 4 Hypervisor for RHEL 7Fixed RHSA-2021:3477
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2021:3235
Not affected: 3 products
  • RHEL 7-based RHEV-H for RHEV 4 (build requirements)
  • RHEL 8-based RHEV-H for RHEV 4 (build requirements)
  • Red Hat Enterprise Linux 9

Timeline

  1. 2025-10-06 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2021-22555

References

Exploit 5

Patch 2

Advisory 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2023-00252 Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel KEVCVSS 3.1HIGH 7.9
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences