CVE-2024-49976tracing/timerlat: Drop interface_lock in stop_kthread()
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 19 months later
· 19 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected b4fdabffae14cca2c80d99bd81f3f27239ac7f5e – < a4a05ceffe8fad68b45de38fe2311bda619e76e2
- affected 4679272d5252720746fd9c5465352cbc5665f230 – < 09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a
- affected 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad – < db8571a9a098086608c11a15856ff585789e67e8
- affected 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad – < b484a02c9cedf8703eff8f0756f94618004bd165
- affected 6.6.51 – < 6.6.55
- affected 6.10.10 – < 6.10.14
- affected 6.11
- unaffected < 6.11
- unaffected 6.6.55 – ≤ 6.6.*
- unaffected 6.10.14 – ≤ 6.10.*
- unaffected 6.11.3 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References4
- https://git.kernel.org/stable/c/a4a05ceffe8fad68b45de38fe2311bda619e76e2 (opens in a new tab)
- https://git.kernel.org/stable/c/09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a (opens in a new tab)
- https://git.kernel.org/stable/c/db8571a9a098086608c11a15856ff585789e67e8 (opens in a new tab)
- https://git.kernel.org/stable/c/b484a02c9cedf8703eff8f0756f94618004bd165 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-43654 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-49976)Record last updated .