CVE-2024-44958

sched/smt: Fix unbalance sched_smt_present dec/inc

State: Published
Severity: Not scored
Published: Sep 4, 2024
Updated: May 23, 2026
Reserved: Aug 21, 2024

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c5511d03ec090980732e929c318a7a6374b5550e to before 2a3548c7ef2e135aee40e7e5e44e7d11b893e7c4Affected c5511d03ec090980732e929c318a7a6374b5550e to before 2cf7665efe451e48d27953e6b5bc627d518c902bAffected c5511d03ec090980732e929c318a7a6374b5550e to before 65727331b60197b742089855ac09464c22b96f66Affected c5511d03ec090980732e929c318a7a6374b5550e to before d0c87a3c6be10a57aa3463c32c3fc6b2a47c3dabAffected c5511d03ec090980732e929c318a7a6374b5550e to before e22f910a26cc2a3ac9c66b8e935ef2a7dd881117Affected 01659361c63fdc91c0af239d08cdd211d590a656Affected a2c094816f894b7a265851fad858e994fa0f78b3Affected 4.14.86 to before 4.15Affected 4.19.7 to before 4.20Affected
LinuxLinux	4.20Affected before 4.20Not affected 5.15.165 through 5.15.Not affected 6.1.105 through 6.1.Not affected 6.6.46 through 6.6.Not affected 6.10.5 through 6.10.Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

c5511d03ec090980732e929c318a7a6374b5550e to before 2a3548c7ef2e135aee40e7e5e44e7d11b893e7c4Affected
c5511d03ec090980732e929c318a7a6374b5550e to before 2cf7665efe451e48d27953e6b5bc627d518c902bAffected
c5511d03ec090980732e929c318a7a6374b5550e to before 65727331b60197b742089855ac09464c22b96f66Affected
c5511d03ec090980732e929c318a7a6374b5550e to before d0c87a3c6be10a57aa3463c32c3fc6b2a47c3dabAffected
c5511d03ec090980732e929c318a7a6374b5550e to before e22f910a26cc2a3ac9c66b8e935ef2a7dd881117Affected
01659361c63fdc91c0af239d08cdd211d590a656Affected
a2c094816f894b7a265851fad858e994fa0f78b3Affected
4.14.86 to before 4.15Affected
4.19.7 to before 4.20Affected

LinuxLinux

4.20Affected
before 4.20Not affected
5.15.165 through 5.15.*Not affected
6.1.105 through 6.1.*Not affected
6.6.46 through 6.6.*Not affected
6.10.5 through 6.10.*Not affected
6.11 and laterNot affected

References

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