CVE-2024-49976: tracing/timerlat: Drop interface_lock in stop_kthread()
Vulnerability summary
CVE-2024-49976 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.4% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 24 · Related 24Timeline
- 21-10-2024PublishedVulnerability first disclosed.
- 23-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Drop interface_lock in stop_kthread() stop_kthread() is the offline callback for "trace/osnoise:online", since commit 5bfbcd1ee57b ("tracing/timerlat: Add interface_lock around clearing of kthread in stop_kthread()"), the following ABBA deadlock scenario is introduced: T1 | T2 [BP] | T3 [AP] osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() | As the interface_lock here in just for protecting the "kthread" field of the osn_var, use xchg() instead to fix this issue. Also use for_each_online_cpu() back in stop_per_cpu_kthreads() as it can take cpu_read_lock() again.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.18% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu94 products
- linux< 6.8.0-54.56
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1023.25
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ b4fdabffae14cca2c80d99bd81f3f27239ac7f5e, < a4a05ceffe8fad68b45de38fe2311bda619e76e2 | ≥ 4679272d5252720746fd9c5465352cbc5665f230, < 09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a | ≥ 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad, < db8571a9a098086608c11a15856ff585789e67e8 | ≥ 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad, < b484a02c9cedf8703eff8f0756f94618004bd165 | ≥ 6.6.51, < 6.6.55 | ≥ 6.10.10, < 6.10.14 | 6.11
- linux_kernel≥ 6.6.51, < 6.6.55 | ≥ 6.10.10, < 6.10.14 | ≥ 6.11, < 6.11.3 | 6.12:rc1
Debian1 product
- linux< 6.11.4-1
3 vendors · 97 products
