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TI-2021-08860 Aliases CVE-2021-27365GHSA-qwp9-8pwv-6hg4

An issue was discovered in the Linux kernel through 5.11.3.

Priority LOW 38CWE-787Published · 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
Fixed

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

Summary

An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.

Why it matters now

EPSS 0.02097 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 19 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 4.4.260; 4.5 to before 4.9.260; 4.10 to before 4.14.224; 4.15 to before 4.19.179; 4.20 to before 5.4.103; 5.5 to before 5.10.21; 5.11 to before 5.11.4VulnerableLinux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:a:oracle:tekelec_platform_distribution:*:*:*:*:*:*:*:*7.4.0 – 7.7.1VulnerableOracle
cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.4.260; 4.5 to before 4.9.260; 4.10 to before 4.14.224; 4.15 to before 4.19.179; 4.20 to before 5.4.103; 5.5 to before 5.10.21; 5.11 to before 5.11.4 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:a:oracle:tekelec_platform_distribution:*:*:*:*:*:*:*:* Versions 7.4.0 – 7.7.1 Vulnerable ·Oracle
  • cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp

Remediation

Red Hat 19 advisories

  • RHSA-2021:1531 Released 2021-05-11 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) bpftool-3.10.0-1062.49.1.el7, kernel-3.10.0-1062.49.1.el7, kernel-abi-whitelists-3.10.0-1062.49.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.49.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.7) bpftool-3.10.0-1062.49.1.el7, kernel-3.10.0-1062.49.1.el7, kernel-abi-whitelists-3.10.0-1062.49.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) kernel-debug-devel-3.10.0-1062.49.1.el7, kernel-tools-libs-devel-3.10.0-1062.49.1.el7
  • RHSA-2021:1532 Released 2021-05-11 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server EUS (v. 7.7) kpatch-patch-3_10_0-1062_26_1-1-3.el7, kpatch-patch-3_10_0-1062_30_1-1-3.el7, kpatch-patch-3_10_0-1062_31_2-1-3.el7 +8
  • RHSA-2021:1376 Released 2021-04-27 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) bpftool-3.10.0-957.72.1.el7, kernel-3.10.0-957.72.1.el7, kernel-abi-whitelists-3.10.0-957.72.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.72.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.6) bpftool-3.10.0-957.72.1.el7, kernel-3.10.0-957.72.1.el7, kernel-abi-whitelists-3.10.0-957.72.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) kernel-debug-devel-3.10.0-957.72.1.el7, kernel-tools-libs-devel-3.10.0-957.72.1.el7
    • Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS kernel-devel-3.10.0-957.72.1.el7, perf-3.10.0-957.72.1.el7, python-perf-3.10.0-957.72.1.el7
Show 16 more Red Hat advisories
  • RHSA-2021:1377 Released 2021-04-27 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server EUS (v. 7.6) kpatch-patch-3_10_0-957_54_1-1-3.el7, kpatch-patch-3_10_0-957_56_1-1-3.el7, kpatch-patch-3_10_0-957_58_2-1-3.el7 +6
  • RHSA-2021:1379 Released 2021-04-27 · Red Hat rating Important
    kernel-alt security and bug fix update
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) kernel-4.14.0-115.36.1.el7a, kernel-alt-4.14.0-115.36.1.el7a, kernel-bootwrapper-4.14.0-115.36.1.el7a +6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debug-devel-4.14.0-115.36.1.el7a, kernel-tools-libs-devel-4.14.0-115.36.1.el7a
  • RHSA-2021:1373 Released 2021-04-27 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.3) kernel-3.10.0-514.88.1.el7, kernel-abi-whitelists-3.10.0-514.88.1.el7, kernel-debug-3.10.0-514.88.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-tools-libs-devel-3.10.0-514.88.1.el7
  • RHSA-2021:1295 Released 2021-04-20 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) kpatch-patch-4_18_0-193-1-13.el8, kpatch-patch-4_18_0-193_13_2-1-8.el8_2, kpatch-patch-4_18_0-193_14_3-1-8.el8_2 +10
  • RHSA-2021:1289 Released 2021-04-20 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.2) kernel-3.10.0-327.96.1.el7, kernel-abi-whitelists-3.10.0-327.96.1.el7, kernel-debug-3.10.0-327.96.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-tools-libs-devel-3.10.0-327.96.1.el7
  • RHSA-2021:1288 Released 2021-04-20 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server (v. 6 ELS) kernel-2.6.32-754.39.1.el6, kernel-abi-whitelists-2.6.32-754.39.1.el6, kernel-debug-2.6.32-754.39.1.el6 +7
    • Red Hat Enterprise Linux Server Optional (v. 6 ELS) python-perf-2.6.32-754.39.1.el6
  • RHSA-2021:1272 Released 2021-04-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.51.1.el8_2
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.51.1.el8_2, kernel-4.18.0-193.51.1.el8_2, kernel-abi-whitelists-4.18.0-193.51.1.el8_2 +19
  • RHSA-2021:1279 Released 2021-04-20 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-core-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-debug-4.18.0-193.51.1.rt13.101.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-core-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-debug-4.18.0-193.51.1.rt13.101.el8_2 +9
  • RHSA-2021:1267 Released 2021-04-20 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.84.1.el7, kernel-abi-whitelists-3.10.0-693.84.1.el7, kernel-debug-3.10.0-693.84.1.el7 +7
    • Red Hat Enterprise Linux Server E4S (v. 7.4) kernel-3.10.0-693.84.1.el7, kernel-abi-whitelists-3.10.0-693.84.1.el7, kernel-bootwrapper-3.10.0-693.84.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.84.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debug-devel-3.10.0-693.84.1.el7, kernel-tools-libs-devel-3.10.0-693.84.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.84.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.4) kernel-3.10.0-693.84.1.el7, kernel-abi-whitelists-3.10.0-693.84.1.el7, kernel-debug-3.10.0-693.84.1.el7 +7
  • RHSA-2021:1171 Released 2021-04-13 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-tools-libs-devel-4.18.0-147.44.1.el8_1
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) bpftool-4.18.0-147.44.1.el8_1, kernel-4.18.0-147.44.1.el8_1, kernel-abi-whitelists-4.18.0-147.44.1.el8_1 +19
  • RHSA-2021:1173 Released 2021-04-13 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) kpatch-patch-4_18_0-147_13_2-1-9.el8_1, kpatch-patch-4_18_0-147_20_1-1-8.el8_1, kpatch-patch-4_18_0-147_24_2-1-6.el8_1 +5
  • RHSA-2021:1071 Released 2021-04-08 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.24.1.el7, kernel-3.10.0-1160.24.1.el7, kernel-abi-whitelists-3.10.0-1160.24.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.24.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.24.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.24.1.el7, kernel-3.10.0-1160.24.1.el7, kernel-abi-whitelists-3.10.0-1160.24.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.24.1.el7, kernel-tools-libs-devel-3.10.0-1160.24.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.24.1.el7, kernel-3.10.0-1160.24.1.el7, kernel-abi-whitelists-3.10.0-1160.24.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.24.1.el7
  • RHSA-2021:1093 Released 2021-04-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.22.1.el8_3
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.22.1.el8_3, kernel-4.18.0-240.22.1.el8_3, kernel-abi-whitelists-4.18.0-240.22.1.el8_3 +19
  • RHSA-2021:1081 Released 2021-04-06 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +9
  • RHSA-2021:1069 Released 2021-04-06 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1160-1-5.el7, kpatch-patch-3_10_0-1160_11_1-1-4.el7, kpatch-patch-3_10_0-1160_15_2-1-4.el7 +4
  • RHSA-2021:1070 Released 2021-04-06 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.24.1.rt56.1161.el7, kernel-rt-debug-3.10.0-1160.24.1.rt56.1161.el7, kernel-rt-debug-devel-3.10.0-1160.24.1.rt56.1161.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.24.1.rt56.1161.el7, kernel-rt-debug-3.10.0-1160.24.1.rt56.1161.el7, kernel-rt-debug-devel-3.10.0-1160.24.1.rt56.1161.el7 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1093
Red Hat CodeReady Linux Builder EUS (v. 8.1)Fixed RHSA-2021:1171
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2021:1272
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:1093
Red Hat Enterprise Linux BaseOS EUS (v. 8.1)Fixed RHSA-2021:1171, RHSA-2021:1173
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2021:1272, RHSA-2021:1295
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6)Fixed RHSA-2021:1376
Red Hat Enterprise Linux ComputeNode EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6)Fixed RHSA-2021:1376
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:1081
Red Hat Enterprise Linux Real Time EUS (v. 8.2)Fixed RHSA-2021:1279
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:1081
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2)Fixed RHSA-2021:1279
Red Hat Enterprise Linux Server (v. 6 ELS)Fixed RHSA-2021:1288
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:1069, RHSA-2021:1071
Red Hat Enterprise Linux Server AUS (v. 7.2)Fixed RHSA-2021:1289
Red Hat Enterprise Linux Server AUS (v. 7.3)Fixed RHSA-2021:1373
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Server E4S (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2021:1376, RHSA-2021:1377
Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2021:1531, RHSA-2021:1532
Red Hat Enterprise Linux Server Optional (v. 6 ELS)Fixed RHSA-2021:1288
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux Server Optional AUS (v. 7.2)Fixed RHSA-2021:1289
Red Hat Enterprise Linux Server Optional AUS (v. 7.3)Fixed RHSA-2021:1373
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Server Optional E4S (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Server Optional EUS (v. 7.6)Fixed RHSA-2021:1376
Red Hat Enterprise Linux Server Optional EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux Server Optional TUS (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Server TUS (v. 7.4)Fixed RHSA-2021:1267
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:1071
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2021:1379
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2021:1379
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2021:1070
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2021:1070
Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUSFixed RHSA-2021:1376
Not affected: 2 products
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27365
  2. 2026-10-03 Alias added: GHSA-qwp9-8pwv-6hg4

References

Exploit 1

Patch 3

Advisory 6

Sources

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