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🛡️ CVE-2024-44958 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

sched/smt: Fix unbalance sched_smt_present dec/inc

In the Linux kernel, the following vulnerability has been resolved:

sched/smt: Fix unbalance sched_smt_present dec/inc

I got the following warn report while doing stress test:

jump label: negative count!

WARNING: CPU: 3 PID: 38 at kernel/jump_label.c:263 static_key_slow_try_dec+0x9d/0xb0

Call Trace:

<TASK>

__static_key_slow_dec_cpuslocked+0x16/0x70

sched_cpu_deactivate+0x26e/0x2a0

cpuhp_invoke_callback+0x3ad/0x10d0

cpuhp_thread_fun+0x3f5/0x680

smpboot_thread_fn+0x56d/0x8d0

kthread+0x309/0x400

ret_from_fork+0x41/0x70

ret_from_fork_asm+0x1b/0x30

</TASK>

Because when cpuset_cpu_inactive() fails in sched_cpu_deactivate(),

the cpu offline failed, but sched_smt_present is decremented before

calling sched_cpu_deactivate(), it leads to unbalanced dec/inc, so

fix it by incrementing sched_smt_present in the error path.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-44958 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.10.5)
  • linux-kernel

Timeline and source

Published on 4 September 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
lists.debian.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2024-44958 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-09-04
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.10.5
linux-kernel — —

Similar Threats

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