Improper Resource Locking Affecting perf package, versions <0:4.18.0-477.67.1.el8_8
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Test your applications- Snyk ID SNYK-RHEL8-PERF-7685174
- published 14 Aug 2024
- disclosed 3 Apr 2024
Introduced: 3 Apr 2024
CVE-2024-26686 Open this link in a new tabHow to fix?
Upgrade RHEL:8 perf to version 0:4.18.0-477.67.1.el8_8 or higher.
This issue was patched in RHSA-2024:5255.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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.