CVE-2024-44958: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 4.14.86, before 4.15 (fixed in 4.15); from 4.19.7, before 4.20 (fixed in 4.20); from 4.20, before 5.15.165 (fixed in 5.15.165); from 5.16, before 6.1.105 (fixed in 6.1.105); from 6.2, before 6.6.46 (fixed in 6.6.46); from 6.7, before 6.10.5 (fixed in 6.10.5); …

Published 2024-09-04. Last modified 2026-06-17.