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TI-2026-31254 Aliases CVE-2026-43074GHSA-4j6h-qqh4-vpw7

eventpoll: defer struct eventpoll free to RCU grace period

Priority LOW 37CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution, Denial of service
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416, CWE-401 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00482 41st percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.136, 6.12.83, 6.18.24 +2Red Hat: 7 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
LinuxLinux6.4 and later6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0Patch availableCNA
  • Linux VendorLinux Affected 6.4 and later Fixed in 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.4.1 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*6.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*7.0 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*7.0 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*7.0 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*7.0 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*7.0 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*7.0 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*7.0 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.4.1 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:* Versions 6.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* Versions 7.0 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* Versions 7.0 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* Versions 7.0 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* Versions 7.0 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0

Red Hat 7 advisories

  • RHSA-2026:73187 Released 2026-09-29 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • NVIDIA for RHEL 10 kernel-6.12.0-259.26.el10nv, kernel-64k-6.12.0-259.26.el10nv, kernel-64k-core-6.12.0-259.26.el10nv +38
  • RHSA-2026:39371 Released 2026-07-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.88.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.88.1.el10_0, kernel-64k-devel-6.12.0-55.88.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.88.1.el10_0, kernel-64k-6.12.0-55.88.1.el10_0, kernel-64k-core-6.12.0-55.88.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.88.1.el10_0, libperf-6.12.0-55.88.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.88.1.el10_0, kernel-rt-64k-6.12.0-55.88.1.el10_0, kernel-rt-64k-core-6.12.0-55.88.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.88.1.el10_0, kernel-rt-core-6.12.0-55.88.1.el10_0, kernel-rt-debug-6.12.0-55.88.1.el10_0 +11
  • RHSA-2026:38902 Released 2026-07-13 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.127.1.el9_6, libperf-5.14.0-570.127.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.127.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.127.1.el9_6, kernel-64k-devel-5.14.0-570.127.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.127.1.el9_6, kernel-64k-5.14.0-570.127.1.el9_6, kernel-64k-core-5.14.0-570.127.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.127.1.el9_6, kernel-rt-64k-5.14.0-570.127.1.el9_6, kernel-rt-64k-core-5.14.0-570.127.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.127.1.el9_6, kernel-rt-core-5.14.0-570.127.1.el9_6, kernel-rt-debug-5.14.0-570.127.1.el9_6 +11
Show 4 more Red Hat advisories
  • RHSA-2026:37729 Released 2026-07-10 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.137.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.137.1.el9_4, kernel-64k-devel-5.14.0-427.137.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.137.1.el9_4, kernel-5.14.0-427.137.1.el9_4, kernel-64k-5.14.0-427.137.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.137.1.el9_4, kernel-rt-core-5.14.0-427.137.1.el9_4, kernel-rt-debug-5.14.0-427.137.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.137.1.el9_4, kernel-rt-core-5.14.0-427.137.1.el9_4, kernel-rt-debug-5.14.0-427.137.1.el9_4 +11
  • RHSA-2026:36645 Released 2026-07-08 · Red Hat rating Important
    kernel update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.23.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.23.1.el9_8, kernel-64k-devel-5.14.0-687.23.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.23.1.el9_8, kernel-64k-5.14.0-687.23.1.el9_8, kernel-64k-core-5.14.0-687.23.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.23.1.el9_8, libperf-5.14.0-687.23.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.23.1.el9_8, kernel-rt-64k-5.14.0-687.23.1.el9_8, kernel-rt-64k-core-5.14.0-687.23.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.23.1.el9_8, kernel-rt-core-5.14.0-687.23.1.el9_8, kernel-rt-debug-5.14.0-687.23.1.el9_8 +9
  • RHSA-2026:36541 Released 2026-07-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.31.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.31.1.el10_2, kernel-64k-devel-6.12.0-211.31.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.31.1.el10_2, kernel-64k-6.12.0-211.31.1.el10_2, kernel-64k-core-6.12.0-211.31.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.31.1.el10_2, libperf-6.12.0-211.31.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-64k-6.12.0-211.31.1.el10_2, kernel-rt-64k-core-6.12.0-211.31.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-core-6.12.0-211.31.1.el10_2, kernel-rt-debug-6.12.0-211.31.1.el10_2 +9
  • RHSA-2026:36186 Released 2026-07-07 · Red Hat rating Important
    kernel security update
    • NVIDIA for RHEL 10 kernel-6.12.0-231.15.el10nv, kernel-64k-6.12.0-231.15.el10nv, kernel-64k-core-6.12.0-231.15.el10nv +32

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
NVIDIA for RHEL 10Fixed RHSA-2026:36186, RHSA-2026:73187
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:38902
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:36645
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:37729
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:39371
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:38902
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:36645
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:37729
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:39371
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:38902
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:36645
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:39371
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:36645
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:37729
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:39371
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:38902
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:36645
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:37729
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:39371
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:38902
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43074
  2. 2026-10-03 Alias added: GHSA-4j6h-qqh4-vpw7
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-19 Weakness changed · CISA ADP

References

Patch 5

Other 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-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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