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TI-2025-26517 Aliases CVE-2025-39843GHSA-fwr4-vx34-qhjp

mm: slub: avoid wake up kswapd in set_track_prepare

Priority LOW 24CWE-667Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 20 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: mm: slub: avoid wake up kswapd in set_track_prepare set_track_prepare() can incur lock recursion. The issue is that it is called from hrtimer_start_range_ns holding the per_cpu(hrtimer_bases)[n].lock, but when enabled CONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare, and try to hold the per_cpu(hrtimer_bases)[n].lock. Avoid deadlock caused by implicitly waking up kswapd by passing in allocation flags, which do not contain __GFP_KSWAPD_RECLAIM in the debug_objects_fill_pool() case. Inside stack depot they are processed by gfp_nested_mask(). Since ___slab_alloc() has preemption disabled, we mask out __GFP_DIRECT_RECLAIM from the flags there. The oops looks something like: BUG: spinlock recursion on CPU#3, swapper/3/0 lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3 Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT) Call trace: spin_bug+0x0 _raw_spin_lock_irqsave+0x80 hrtimer_try_to_cancel+0x94 task_contending+0x10c enqueue_dl_entity+0x2a4 dl_server_start+0x74 enqueue_task_fair+0x568 enqueue_task+0xac do_activate_task+0x14c ttwu_do_activate+0xcc try_to_wake_up+0x6c8 default_wake_function+0x20 autoremove_wake_function+0x1c __wake_up+0xac wakeup_kswapd+0x19c wake_all_kswapds+0x78 __alloc_pages_slowpath+0x1ac __alloc_pages_noprof+0x298 stack_depot_save_flags+0x6b0 stack_depot_save+0x14 set_track_prepare+0x5c ___slab_alloc+0xccc __kmalloc_cache_noprof+0x470 __set_page_owner+0x2bc post_alloc_hook[jt]+0x1b8 prep_new_page+0x28 get_page_from_freelist+0x1edc __alloc_pages_noprof+0x13c alloc_slab_page+0x244 allocate_slab+0x7c ___slab_alloc+0x8e8 kmem_cache_alloc_noprof+0x450 debug_objects_fill_pool+0x22c debug_object_activate+0x40 enqueue_hrtimer[jt]+0xdc hrtimer_start_range_ns+0x5f8 ...

Why it matters now

EPSS 0.00117 1st percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.151, 6.6.105, 6.12.46 +2Red Hat: 4 advisoriesRed Hat: 20 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
LinuxLinux5.19 and later6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17Patch availableCNA
  • Linux VendorLinux Affected 5.19 and later Fixed in 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.19 to before 6.1.151; 6.2 to before 6.6.105; 6.7 to before 6.12.46; 6.13 to before 6.16.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*6.17 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*6.17 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*6.17 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*6.17 rc4VulnerableLinux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.19 to before 6.1.151; 6.2 to before 6.6.105; 6.7 to before 6.12.46; 6.13 to before 6.16.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* Versions 6.17 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* Versions 6.17 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* Versions 6.17 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* Versions 6.17 rc4 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17

Red Hat 4 advisories

  • RHSA-2026:0453 Released 2026-01-12 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.27.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.27.1.el10_1, kernel-64k-devel-6.12.0-124.27.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.27.1.el10_1, kernel-64k-6.12.0-124.27.1.el10_1, kernel-64k-core-6.12.0-124.27.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.27.1.el10_1, libperf-6.12.0-124.27.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.27.1.el10_1, kernel-rt-64k-6.12.0-124.27.1.el10_1, kernel-rt-64k-core-6.12.0-124.27.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.27.1.el10_1, kernel-rt-core-6.12.0-124.27.1.el10_1, kernel-rt-debug-6.12.0-124.27.1.el10_1 +9
  • RHSA-2026:0271 Released 2026-01-08 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.52.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.52.1.el10_0, kernel-64k-devel-6.12.0-55.52.1.el10_0 +8
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.52.1.el10_0, kernel-64k-6.12.0-55.52.1.el10_0, kernel-64k-core-6.12.0-55.52.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.52.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.52.1.el10_0, kernel-rt-64k-6.12.0-55.52.1.el10_0, kernel-rt-64k-core-6.12.0-55.52.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.52.1.el10_0, kernel-rt-core-6.12.0-55.52.1.el10_0, kernel-rt-debug-6.12.0-55.52.1.el10_0 +11
  • RHSA-2025:23789 Released 2025-12-22 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.76.1.el9_6, libperf-5.14.0-570.76.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.76.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.76.1.el9_6, kernel-64k-devel-5.14.0-570.76.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.76.1.el9_6, kernel-64k-5.14.0-570.76.1.el9_6, kernel-64k-core-5.14.0-570.76.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.76.1.el9_6, kernel-rt-64k-5.14.0-570.76.1.el9_6, kernel-rt-64k-core-5.14.0-570.76.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.76.1.el9_6, kernel-rt-core-5.14.0-570.76.1.el9_6, kernel-rt-debug-5.14.0-570.76.1.el9_6 +11
Show 1 more Red Hat advisories
  • RHSA-2025:21926 Released 2025-11-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.9.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.9.1.el9_7, kernel-64k-devel-5.14.0-611.9.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.9.1.el9_7, kernel-64k-5.14.0-611.9.1.el9_7, kernel-64k-core-5.14.0-611.9.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.9.1.el9_7, libperf-5.14.0-611.9.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.9.1.el9_7, kernel-rt-64k-5.14.0-611.9.1.el9_7, kernel-rt-64k-core-5.14.0-611.9.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.9.1.el9_7, kernel-rt-core-5.14.0-611.9.1.el9_7, kernel-rt-debug-5.14.0-611.9.1.el9_7 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix planned: Will not fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2025:23789
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:21926
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:0271
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2025:23789
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:21926
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:0271
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2025:23789
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:21926
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:0271
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:21926
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:0271
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2025:23789
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:21926
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:0271
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2025:23789
Not affected: 8 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0)
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-39843
  2. 2026-10-03 Alias added: GHSA-fwr4-vx34-qhjp

References

Patch 5

Advisory 1

  • 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