In the Linux kernel, the following vulnerability has been resolved:

signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()

When a multi-threaded process receives a stop signal (e.g., SIGSTOP),
do_signal_stop() sets JOBCTL_STOP_PENDING and JOBCTL_STOP_CONSUME on all
threads and sets signal->group_stop_count to the number of threads. If
one of the threads concurrently calls execve(), de_thread() invokes
zap_other_threads() to kill all other threads. zap_other_threads()
aborts the pending group stop by resetting signal->group_stop_count to 0
and clears the JOBCTL_PENDING_MASK for all other threads. However, it
fails to clear the job control flags for the calling thread.

When execve() completes, the calling thread returns to user mode and
checks for pending signals. Seeing the stale JOBCTL_STOP_PENDING flag,
it calls do_signal_stop(), which invokes task_participate_group_stop().
Since JOBCTL_STOP_CONSUME is still set, it attempts to decrement the
already-zero signal->group_stop_count, triggering a warning:

sig->group_stop_count == 0
WARNING: CPU: 1 PID: 6475 at kernel/signal.c:373
task_participate_group_stop+0x215/0x2d0
Call Trace:
 <TASK>
 do_signal_stop+0x3be/0x5c0 kernel/signal.c:2619
 get_signal+0xa8c/0x1330 kernel/signal.c:2884
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 </TASK>

Fix this race condition by clearing the JOBCTL_PENDING_MASK for the
calling thread in zap_other_threads(), ensuring it does not retain any
stale job control state after the thread group is destroyed. This aligns
with other functions that tear down a thread group and abort group
stops, such as zap_process() and complete_signal(), which correctly
clear these flags for all threads including the current one.

https://git.kernel.org/stable/c/2b32b2fb241435145ea199efac024540759d2495

https://git.kernel.org/stable/c/391ebe74456a0f1d60b3ba4a8a64d9f44c1728fe

https://git.kernel.org/stable/c/76aebd9ef20078719dfd6282d3b06c27e900a65a

https://git.kernel.org/stable/c/8c046f36222c6ce1e0daef2c45c891c72602f8a1

https://git.kernel.org/stable/c/90918794a4e2c3b440f8fcf3847765a8b1d81b25

https://git.kernel.org/stable/c/dfcd0ba14769d94d76ac9d9814b85e7fcacd4e29

https://git.kernel.org/stable/c/f4aae11abb449dc536269705d0419ec69480faa9

https://git.kernel.org/stable/c/f8d720bc2e35d568c18be0644e92a468de428370

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["kernel/signal.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"2b32b2fb241435145ea199efac024540759d2495","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"391ebe74456a0f1d60b3ba4a8a64d9f44c1728fe","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"f8d720bc2e35d568c18be0644e92a468de428370","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"f4aae11abb449dc536269705d0419ec69480faa9","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"76aebd9ef20078719dfd6282d3b06c27e900a65a","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"8c046f36222c6ce1e0daef2c45c891c72602f8a1","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"dfcd0ba14769d94d76ac9d9814b85e7fcacd4e29","versionType":"git","status":"affected"},{"version":"39efa3ef3a376a4e53de2f82fc91182459d34200","lessThan":"90918794a4e2c3b440f8fcf3847765a8b1d81b25","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["kernel/signal.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"3.0","status":"affected"},{"version":"0","lessThan":"3.0","versionType":"semver","status":"unaffected"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","versionType":"semver","status":"unaffected"},{"version":"7.1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]