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TI-2026-38060 Aliases CVE-2026-52973GHSA-9qj4-wr4g-7m6f

futex: Drop CLONE_THREAD requirement for private default hash alloc

Priority LOW 35CWE-825Published · 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 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: futex: Drop CLONE_THREAD requirement for private default hash alloc Currently need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any CLONE_VM clone, except vfork(). Excluding vfork keeps the existing paths untouched (no overhead), and we can't race in the first place: either the parent is suspended and the child runs alone, or mm->futex_ref is already allocated from an earlier CLONE_VM.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00184 8th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.18.33, 7.0.10, 7.1Red Hat: 4 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
LinuxLinux6.17 and later6.18.33, 7.0.10, 7.1Patch availableCNA
  • Linux VendorLinux Affected 6.17 and later Fixed in 6.18.33, 7.0.10, 7.1 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.17.1 to before 6.18.33; 6.19 to before 7.0.10VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*6.17VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*6.17 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*6.17 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*6.17 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.17.1 to before 6.18.33; 6.19 to before 7.0.10 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:* Versions 6.17 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* Versions 6.17 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* Versions 6.17 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:* Versions 6.17 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.18.33, 7.0.10, 7.1

Red Hat 4 advisories

  • RHSA-2026:62640 Released 2026-09-02 · Red Hat rating Important
    kpatch-patch-5_14_0-687_10_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-8.el9_8
  • RHSA-2026:62642 Released 2026-09-02 · Red Hat rating Important
    kpatch-patch-6_12_0-211_16_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-1-8.el10_2
  • RHSA-2026:47040 Released 2026-07-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.31.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.31.1.el9_8, kernel-64k-devel-5.14.0-687.31.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.31.1.el9_8, kernel-64k-5.14.0-687.31.1.el9_8, kernel-64k-core-5.14.0-687.31.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.31.1.el9_8, libperf-5.14.0-687.31.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.31.1.el9_8, kernel-rt-64k-5.14.0-687.31.1.el9_8, kernel-rt-64k-core-5.14.0-687.31.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.31.1.el9_8, kernel-rt-core-5.14.0-687.31.1.el9_8, kernel-rt-debug-5.14.0-687.31.1.el9_8 +9
Show 1 more Red Hat advisories
  • RHSA-2026:45114 Released 2026-07-24 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.39.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.39.1.el10_2, kernel-64k-devel-6.12.0-211.39.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.39.1.el10_2, kernel-64k-6.12.0-211.39.1.el10_2, kernel-64k-core-6.12.0-211.39.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.39.1.el10_2, libperf-6.12.0-211.39.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.39.1.el10_2, kernel-rt-64k-6.12.0-211.39.1.el10_2, kernel-rt-64k-core-6.12.0-211.39.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.39.1.el10_2, kernel-rt-core-6.12.0-211.39.1.el10_2, kernel-rt-debug-6.12.0-211.39.1.el10_2 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:45114
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:45114, RHSA-2026:62642
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:47040, RHSA-2026:62640
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:45114
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:45114
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:45114
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:47040
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-2026-52973
  2. 2026-10-03 Alias added: GHSA-9qj4-wr4g-7m6f
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP
  5. 2026-10-29 Affected versions changed · Red Hat

References

Patch 3

Advisory 3

  • 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