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Ubuntu: (CVE-2024-26686): linux-raspi-realtime vulnerability

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Ubuntu: (CVE-2024-26686): linux-raspi-realtime vulnerability

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
04/03/2024
Created
02/12/2025
Added
02/11/2025
Modified
02/11/2025

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.

Solution(s)

  • ubuntu-upgrade-linux-raspi-realtime

References

  • https://attackerkb.com/topics/cve-2024-26686
  • CVE - 2024-26686
  • https://git.kernel.org/linus/7601df8031fd67310af891897ef6cc0df4209305
  • https://git.kernel.org/stable/c/27978243f165b44e342f28f449b91327944ea071
  • https://git.kernel.org/stable/c/7601df8031fd67310af891897ef6cc0df4209305
  • https://git.kernel.org/stable/c/cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d
  • https://www.cve.org/CVERecord?id=CVE-2024-26686
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