CVE-2024-50019 Affecting kernel-rt-debug package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELRTDEBUG-8240558
- published 22 Oct 2024
- disclosed 21 Oct 2024
Introduced: 21 Oct 2024
CVE-2024-50019 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel-rt-debug.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
kthread: unpark only parked kthread
Calling into kthread unparking unconditionally is mostly harmless when the kthread is already unparked. The wake up is then simply ignored because the target is not in TASK_PARKED state.
However if the kthread is per CPU, the wake up is preceded by a call to kthread_bind() which expects the task to be inactive and in TASK_PARKED state, which obviously isn't the case if it is unparked.
As a result, calling kthread_stop() on an unparked per-cpu kthread triggers such a warning:
WARNING: CPU: 0 PID: 11 at kernel/kthread.c:525 __kthread_bind_mask kernel/kthread.c:525
<TASK>
kthread_stop+0x17a/0x630 kernel/kthread.c:707
destroy_workqueue+0x136/0xc40 kernel/workqueue.c:5810
wg_destruct+0x1e2/0x2e0 drivers/net/wireguard/device.c:257
netdev_run_todo+0xe1a/0x1000 net/core/dev.c:10693
default_device_exit_batch+0xa14/0xa90 net/core/dev.c:11769
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:640
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Fix this with skipping unecessary unparking while stopping a kthread.
References
- https://access.redhat.com/security/cve/CVE-2024-50019
- https://git.kernel.org/stable/c/19a5029981c87c2ad0845e713837faa88f5d8e2b
- https://git.kernel.org/stable/c/214e01ad4ed7158cab66498810094fac5d09b218
- https://git.kernel.org/stable/c/40a6e660d2a3a7a5cb99f0b8ff4fb41bad039f68
- https://git.kernel.org/stable/c/8608196a155cb6cfae04d96b10a2652d0327e33f
- https://git.kernel.org/stable/c/cda5423c1a1c906062ef235c940f249b97d9d135