Read the docs
TI-2021-02917 Aliases CVE-2021-4028GHSA-qfcc-9m6r-r23m

Use after free in kernel

Priority LOW 34CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 41 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

Why it matters now

EPSS 0.00318 24th percentileScored 2026-11-07
Fix Partial Red Hat: 23 advisoriesRed Hat: 41 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—kernelFixed in kernel 5.15-rc1—No fix listedCNA
  • kernel Vendor— Affected Fixed in kernel 5.15-rc1 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.10 to before 5.10.71; 5.11 to before 5.14.10VulnerableLinux
cpe:2.3:o:suse:linux_enterprise:15.0:sp3:*:*:*:*:*:*15.0 sp3VulnerableSUSE
cpe:2.3:o:suse:linux_enterprise:15.0:sp4:*:*:*:*:*:*15.0 sp4VulnerableSUSE
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.10 to before 5.10.71; 5.11 to before 5.14.10 Vulnerable ·Linux
  • cpe:2.3:o:suse:linux_enterprise:15.0:sp3:*:*:*:*:*:* Versions 15.0 sp3 Vulnerable ·SUSE
  • cpe:2.3:o:suse:linux_enterprise:15.0:sp4:*:*:*:*:*:* Versions 15.0 sp4 Vulnerable ·SUSE

Remediation

Red Hat 23 advisories

  • RHSA-2022:4896 Released 2022-06-03 · Red Hat rating Important
    Red Hat Virtualization security, bug fix, and enhancement update [ovirt-4.5.0]
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.5.0-202205291010_8.6, redhat-virtualization-host-image-update-4.5.0-202205291010_8.6
  • RHSA-2022:2211 Released 2022-05-11 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kpatch-patch-3_10_0-957_72_1-1-7.el7, kpatch-patch-3_10_0-957_76_1-1-7.el7, kpatch-patch-3_10_0-957_78_2-1-6.el7 +5
  • RHSA-2022:2186 Released 2022-05-11 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) bpftool-3.10.0-957.94.1.el7, kernel-3.10.0-957.94.1.el7, kernel-abi-whitelists-3.10.0-957.94.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kernel-3.10.0-957.94.1.el7, kernel-abi-whitelists-3.10.0-957.94.1.el7, kernel-bootwrapper-3.10.0-957.94.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.94.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debug-devel-3.10.0-957.94.1.el7, kernel-tools-libs-devel-3.10.0-957.94.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.94.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.6) bpftool-3.10.0-957.94.1.el7, kernel-3.10.0-957.94.1.el7, kernel-abi-whitelists-3.10.0-957.94.1.el7 +8
Show 20 more Red Hat advisories
  • RHSA-2022:2188 Released 2022-05-11 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.100.1.el7, kernel-abi-whitelists-3.10.0-693.100.1.el7, kernel-debug-3.10.0-693.100.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.100.1.el7
  • RHSA-2022:2189 Released 2022-05-11 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.3) kernel-3.10.0-514.101.1.el7, kernel-abi-whitelists-3.10.0-514.101.1.el7, kernel-debug-3.10.0-514.101.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-tools-libs-devel-3.10.0-514.101.1.el7
  • RHSA-2022:1550 Released 2022-04-26 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-348.23.1.el8_5
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-348.23.1.el8_5, kernel-4.18.0-348.23.1.el8_5, kernel-abi-stablelists-4.18.0-348.23.1.el8_5 +19
  • RHSA-2022:1535 Released 2022-04-26 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-348-1-4.el8, kpatch-patch-4_18_0-348_12_2-1-2.el8_5, kpatch-patch-4_18_0-348_20_1-1-1.el8_5 +2
  • RHSA-2022:1555 Released 2022-04-26 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-core-4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-4.18.0-348.23.1.rt7.153.el8_5 +9
    • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt-4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-core-4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-4.18.0-348.23.1.rt7.153.el8_5 +7
  • RHSA-2022:1373 Released 2022-04-13 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.7) kpatch-patch-3_10_0-1062_49_1-1-6.el7, kpatch-patch-3_10_0-1062_51_1-1-6.el7, kpatch-patch-3_10_0-1062_52_2-1-5.el7 +5
  • RHSA-2022:1324 Released 2022-04-12 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.7) bpftool-3.10.0-1062.66.1.el7, kernel-3.10.0-1062.66.1.el7, kernel-abi-whitelists-3.10.0-1062.66.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.7) bpftool-3.10.0-1062.66.1.el7, kernel-3.10.0-1062.66.1.el7, kernel-abi-whitelists-3.10.0-1062.66.1.el7 +9
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.66.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debug-devel-3.10.0-1062.66.1.el7, kernel-tools-libs-devel-3.10.0-1062.66.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.66.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.7) bpftool-3.10.0-1062.66.1.el7, kernel-3.10.0-1062.66.1.el7, kernel-abi-whitelists-3.10.0-1062.66.1.el7 +8
  • RHSA-2022:1263 Released 2022-04-07 · Red Hat rating Important
    RHV-H security update (redhat-virtualization-host) 4.3.22
    • RHEL 7-based RHEV-H for RHEV 4 (build requirements) redhat-virtualization-host-4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update-4.3.22-20220330.1.el7_9
    • Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host-4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update-4.3.22-20220330.1.el7_9
  • RHSA-2022:1199 Released 2022-04-05 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debug-3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debug-devel-3.10.0-1160.62.1.rt56.1203.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debug-3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debug-devel-3.10.0-1160.62.1.rt56.1203.el7 +7
  • RHSA-2022:1198 Released 2022-04-05 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.62.1.el7, kernel-3.10.0-1160.62.1.el7, kernel-abi-whitelists-3.10.0-1160.62.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.62.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.62.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.62.1.el7, kernel-3.10.0-1160.62.1.el7, kernel-abi-whitelists-3.10.0-1160.62.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.62.1.el7, kernel-tools-libs-devel-3.10.0-1160.62.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.62.1.el7, kernel-3.10.0-1160.62.1.el7, kernel-abi-whitelists-3.10.0-1160.62.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.62.1.el7
  • RHSA-2022:1185 Released 2022-04-05 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1160_24_1-1-8.el7, kpatch-patch-3_10_0-1160_25_1-1-8.el7, kpatch-patch-3_10_0-1160_31_1-1-7.el7 +7
  • RHSA-2022:0958 Released 2022-03-17 · Red Hat rating Important
    kpatch-patch-4_18_0-147_58_1 security and bug fix update
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) kpatch-patch-4_18_0-147_58_1-1-1.el8_1
  • RHSA-2022:0851 Released 2022-03-14 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) kpatch-patch-4_18_0-147_44_1-1-10.el8_1, kpatch-patch-4_18_0-147_48_1-1-7.el8_1, kpatch-patch-4_18_0-147_51_1-1-6.el8_1 +6
  • RHSA-2022:0823 Released 2022-03-10 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) bpftool-4.18.0-147.64.1.el8_1, kernel-4.18.0-147.64.1.el8_1, kernel-abi-whitelists-4.18.0-147.64.1.el8_1 +14
  • RHSA-2022:0777 Released 2022-03-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS EUS (v.8.4) bpftool-4.18.0-305.40.1.el8_4, kernel-4.18.0-305.40.1.el8_4, kernel-abi-stablelists-4.18.0-305.40.1.el8_4 +19
    • Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-tools-libs-devel-4.18.0-305.40.1.el8_4
  • RHSA-2022:0772 Released 2022-03-08 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v.8.4) kpatch-patch-4_18_0-305-1-11.el8, kpatch-patch-4_18_0-305_10_2-1-8.el8_4, kpatch-patch-4_18_0-305_12_1-1-7.el8_4 +8
  • RHSA-2022:0771 Released 2022-03-08 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt-4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-core-4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-4.18.0-305.40.1.rt7.112.el8_4 +9
    • Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt-4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-core-4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-4.18.0-305.40.1.rt7.112.el8_4 +7
  • RHSA-2022:0636 Released 2022-02-22 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.75.1.el8_2
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.75.1.el8_2, kernel-4.18.0-193.75.1.el8_2, kernel-abi-whitelists-4.18.0-193.75.1.el8_2 +19
  • RHSA-2022:0629 Released 2022-02-22 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-core-4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-4.18.0-193.75.1.rt13.125.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-core-4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-4.18.0-193.75.1.rt13.125.el8_2 +9
  • RHSA-2022:0590 Released 2022-02-22 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) kpatch-patch-4_18_0-193_46_1-1-9.el8_2, kpatch-patch-4_18_0-193_47_1-1-9.el8_2, kpatch-patch-4_18_0-193_51_1-1-6.el8_2 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
RHEL 7-based RHEV-H for RHEV 4 (build requirements)Fixed RHSA-2022:1263
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2022:1550
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2022:0636
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2022:1535, RHSA-2022:1550
Red Hat Enterprise Linux BaseOS E4S (v. 8.1)Fixed RHSA-2022:0823, RHSA-2022:0851, RHSA-2022:0958
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2022:0590, RHSA-2022:0636
Red Hat Enterprise Linux BaseOS EUS (v.8.4)Fixed RHSA-2022:0772, RHSA-2022:0777
Red Hat Enterprise Linux CRB EUS (v.8.4)Fixed RHSA-2022:0777
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux NFV EUS (v.8.4)Fixed RHSA-2022:0771
Red Hat Enterprise Linux RT EUS (v.8.4)Fixed RHSA-2022:0771
Red Hat Enterprise Linux Real Time EUS (v. 8.2)Fixed RHSA-2022:0629
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2022:1555
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2)Fixed RHSA-2022:0629
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:1185, RHSA-2022:1198
Red Hat Enterprise Linux Server AUS (v. 7.3)Fixed RHSA-2022:2189
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2022:2188
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2022:2186
Red Hat Enterprise Linux Server AUS (v. 7.7)Fixed RHSA-2022:1324
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2022:2186, RHSA-2022:2211
Red Hat Enterprise Linux Server E4S (v. 7.7)Fixed RHSA-2022:1324, RHSA-2022:1373
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux Server Optional AUS (v. 7.3)Fixed RHSA-2022:2189
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2022:2188
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2022:2186
Red Hat Enterprise Linux Server Optional AUS (v. 7.7)Fixed RHSA-2022:1324
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2022:2186
Red Hat Enterprise Linux Server Optional E4S (v. 7.7)Fixed RHSA-2022:1324
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2022:2186
Red Hat Enterprise Linux Server Optional TUS (v. 7.7)Fixed RHSA-2022:1324
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2022:2186
Red Hat Enterprise Linux Server TUS (v. 7.7)Fixed RHSA-2022:1324
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:1198
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2022:1199
Red Hat Enterprise Linux for Real Time (v. 8)Fixed RHSA-2022:1555
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2022:1199
Red Hat Virtualization 4 Hypervisor for RHEL 7Fixed RHSA-2022:1263
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2022:4896
Not affected: 4 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
  • Red Hat Virtualization 4 Hypervisor for RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-4028
  2. 2026-10-03 Alias added: GHSA-qfcc-9m6r-r23m

References

Patch 3

Advisory 3

Sources

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