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Red Hat: CVE-2024-26686: kernel: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats (Multiple Advisories)

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Red Hat: CVE-2024-26686: kernel: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats (Multiple Advisories)

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
04/03/2024
Created
08/13/2024
Added
08/12/2024
Modified
02/10/2025

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)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • CVE-2024-26686
  • RHSA-2024:10771
  • RHSA-2024:5101
  • RHSA-2024:5102
  • RHSA-2024:5255
  • RHSA-2024:8613
  • RHSA-2024:8614
  • RHSA-2024:9315
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