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TI-2026-38020 Aliases CVE-2026-52933GHSA-37vf-c5qj-3jr7

io_uring/poll: fix signed comparison in io_poll_get_ownership()

Priority LOW 35CWE-190Published · 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-190, CWE-835 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG (BIT(31)) is set in poll_refs, the value becomes negative in signed arithmetic, so the >= 128 comparison always evaluates to false and the slowpath is never taken. Fix this by casting the atomic_read() result to unsigned int before the comparison, so that the cancel flag is treated as a large positive value and correctly triggers the slowpath.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00148 4th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 5.16, 6.1, 6.1.175 +5Red Hat: 9 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
LinuxLinux5.15.82 to before 5.16; 6.0.11 to before 6.15.16, 6.1Patch availableCNA
LinuxLinux6.1 and later6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1Patch availableCNA
  • Linux VendorLinux Affected 5.15.82 to before 5.16; 6.0.11 to before 6.1 Fixed in 5.16, 6.1 Patch available CNA
  • Linux VendorLinux Affected 6.1 and later Fixed in 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.15.82 to before 5.16; 6.0.11 to before 6.1; 6.1.1 to before 6.1.175; 6.2 to before 6.6.140; 6.7 to before 6.12.86; 6.13 to before 6.18.27; 6.19 to before 7.0.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:*6.1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*6.1 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*6.1 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15.82 to before 5.16; 6.0.11 to before 6.1; 6.1.1 to before 6.1.175; 6.2 to before 6.6.140; 6.7 to before 6.12.86; 6.13 to before 6.18.27; 6.19 to before 7.0.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:* Versions 6.1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:* Versions 6.1 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:* Versions 6.1 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.16, 6.1
  • Fix · CNA Linux (Linux) Fixed in 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1

Red Hat 9 advisories

  • RHSA-2026:82326 Released 2026-10-13 · Red Hat rating Important
    kpatch-patch-6_12_0-211_16_1 and kpatch-patch-6_12_0-211_49_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-2-10.el10_2, kpatch-patch-6_12_0-211_49_1-2-2.el10_2
  • RHSA-2026:81452 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-687_10_1 and kpatch-patch-5_14_0-687_42_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-10.el9_8, kpatch-patch-5_14_0-687_42_1-1-1.el9_8
  • RHSA-2026:81451 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-570_116_1, kpatch-patch-5_14_0-570_135_1, kpatch-patch-5_14_0-570_39_1, kpatch-patch-5_14_0-570_66_1, and kpatch-patch-5_14_0-570_94_1 security update
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-11.el9_6, kpatch-patch-5_14_0-570_135_1-1-2.el9_6, kpatch-patch-5_14_0-570_39_1-1-17.el9_6 +2
Show 6 more Red Hat advisories
  • RHSA-2026:81449 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-427_100_1, kpatch-patch-5_14_0-427_113_1, kpatch-patch-5_14_0-427_126_1, kpatch-patch-5_14_0-427_146_1, and kpatch-patch-5_14_0-427_84_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1-1-16.el9_4, kpatch-patch-5_14_0-427_113_1-1-14.el9_4, kpatch-patch-5_14_0-427_126_1-1-11.el9_4 +2
  • RHSA-2026:68100 Released 2026-09-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.150.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.150.1.el9_4, kernel-64k-devel-5.14.0-427.150.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.150.1.el9_4, kernel-5.14.0-427.150.1.el9_4, kernel-64k-5.14.0-427.150.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.150.1.el9_4, kernel-rt-core-5.14.0-427.150.1.el9_4, kernel-rt-debug-5.14.0-427.150.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.150.1.el9_4, kernel-rt-core-5.14.0-427.150.1.el9_4, kernel-rt-debug-5.14.0-427.150.1.el9_4 +11
  • RHSA-2026:67114 Released 2026-09-14 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.104.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.104.1.el10_0, kernel-64k-devel-6.12.0-55.104.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.104.1.el10_0, kernel-64k-6.12.0-55.104.1.el10_0, kernel-64k-core-6.12.0-55.104.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.104.1.el10_0, libperf-6.12.0-55.104.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.104.1.el10_0, kernel-rt-64k-6.12.0-55.104.1.el10_0, kernel-rt-64k-core-6.12.0-55.104.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.104.1.el10_0, kernel-rt-core-6.12.0-55.104.1.el10_0, kernel-rt-debug-6.12.0-55.104.1.el10_0 +11
  • RHSA-2026:65708 Released 2026-09-09 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.140.1.el9_6, libperf-5.14.0-570.140.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.140.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.140.1.el9_6, kernel-64k-devel-5.14.0-570.140.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.140.1.el9_6, kernel-64k-5.14.0-570.140.1.el9_6, kernel-64k-core-5.14.0-570.140.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.140.1.el9_6, kernel-rt-64k-5.14.0-570.140.1.el9_6, kernel-rt-64k-core-5.14.0-570.140.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.140.1.el9_6, kernel-rt-core-5.14.0-570.140.1.el9_6, kernel-rt-debug-5.14.0-570.140.1.el9_6 +11
  • RHSA-2026:64808 Released 2026-09-08 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.45.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.45.1.el9_8, kernel-64k-devel-5.14.0-687.45.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.45.1.el9_8, kernel-64k-5.14.0-687.45.1.el9_8, kernel-64k-core-5.14.0-687.45.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.45.1.el9_8, libperf-5.14.0-687.45.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-64k-5.14.0-687.45.1.el9_8, kernel-rt-64k-core-5.14.0-687.45.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-core-5.14.0-687.45.1.el9_8, kernel-rt-debug-5.14.0-687.45.1.el9_8 +9
  • RHSA-2026:64775 Released 2026-09-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.52.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.52.1.el10_2, kernel-64k-devel-6.12.0-211.52.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.52.1.el10_2, kernel-64k-6.12.0-211.52.1.el10_2, kernel-64k-core-6.12.0-211.52.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.52.1.el10_2, libperf-6.12.0-211.52.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.52.1.el10_2, kernel-rt-64k-6.12.0-211.52.1.el10_2, kernel-rt-64k-core-6.12.0-211.52.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.52.1.el10_2, kernel-rt-core-6.12.0-211.52.1.el10_2, kernel-rt-debug-6.12.0-211.52.1.el10_2 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:67114
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:64775, RHSA-2026:82326
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:64808, RHSA-2026:81452
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:68100, RHSA-2026:81449
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:67114
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:65708, RHSA-2026:81451
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:67114
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:67114
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:67114
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:65708
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-52933
  2. 2026-10-03 Alias added: GHSA-37vf-c5qj-3jr7
  3. 2026-10-12 Fix available: RHSA-2026:81449 · Red Hat
  4. 2026-10-13 Fix available: RHSA-2026:81451 · Red Hat
  5. 2026-10-13 Fix available: RHSA-2026:81452 · Red Hat
  6. 2026-10-13 Affected versions changed · Red Hat
  7. 2026-10-14 Fix available: RHSA-2026:82326 · Red Hat
  8. 2026-10-15 Affected versions changed · Red Hat
  9. 2026-10-16 CISA SSVC decision points changed
  10. 2026-10-19 Weakness changed · CISA ADP
  11. 2026-10-29 Affected versions changed · Red Hat

References

Patch 6

  • 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