CVE-2024-26686
Assigner: Linux
Published: 2024-04-03T14:54:48.530Z
State: PUBLISHED
descriptions: value: 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.
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 1da177e4c3f4
lessThan: cf4b8c39b9a0
status: affected
versionType: git
version: 1da177e4c3f4
lessThan: 27978243f165
status: affected
versionType: git
version: 1da177e4c3f4
lessThan: 7601df8031fd
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 6.1.82
lessThanOrEqual: 6.1.*
status: unaffected
versionType: custom
version: 6.7.6
lessThanOrEqual: 6.7.*
status: unaffected
versionType: custom
version: 6.8
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
x_generator: engine: bippy-d3b290d2becc