CVE-2024-26686
Published: April 4, 2024Last modified: April 4, 2024
Description
In the Linux kernel, the following vulnerability has been resolved: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time. Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.82-r0) |
| Stream | linux-lts | Fixed (6.6.64-r0) |
References
- https://git.kernel.org/stable/c/0c35d1914353799c54fa1843fe7dea6fcbcdbac5
- https://git.kernel.org/stable/c/27978243f165b44e342f28f449b91327944ea071
- https://git.kernel.org/stable/c/3820b0fac7732a653bcc6f6ac20c1d72e697f8f6
- https://git.kernel.org/stable/c/4fe85bdaabd63f8f8579b24a10ed597c9c482164
- https://git.kernel.org/stable/c/7601df8031fd67310af891897ef6cc0df4209305
- https://git.kernel.org/stable/c/cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d