CVE-2024-26686

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CVE-2024-26686

Summary: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats

Details: 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.

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, https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26686.json, https://nvd.nist.gov/vuln/detail/CVE-2024-26686, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git