Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Convert spinlock to mutex to lock evl workqueue drain_workqueue() cannot be called safely in a spinlocked context due to possible task rescheduling. In the multi-task scenario, calling queue_work() while drain_workqueue() will lead to a Call Trace as pushing a work on a draining workqueue is not permitted in spinlocked context. Call Trace: <TASK> ? __warn+0x7d/0x140 ? __queue_work+0x2b2/0x440 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? __queue_work+0x2b2/0x440 queue_work_on+0x28/0x30 idxd_misc_thread+0x303/0x5a0 [idxd] ? __schedule+0x369/0xb40 ? __pfx_irq_thread_fn+0x10/0x10 ? irq_thread+0xbc/0x1b0 irq_thread_fn+0x21/0x70 irq_thread+0x102/0x1b0 ? preempt_count_add+0x74/0xa0 ? __pfx_irq_thread_dtor+0x10/0x10 ? __pfx_irq_thread+0x10/0x10 kthread+0x103/0x140 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x31/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> The current implementation uses a spinlock to protect event log workqueue and will lead to the Call Trace due to potential task rescheduling. To address the locking issue, convert the spinlock to mutex, allowing the drain_workqueue() to be called in a safe mutex-locked context. This change ensures proper synchronization when accessing the event log workqueue, preventing potential Call Trace and improving the overall robustness of the code.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.4, < 6.6.30 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/758071a35d9f3ffd84ff12169d081412a2f5f098Patch
- https://git.kernel.org/stable/c/c9b732a9f73eadc638abdcf0a6d39bc7a0c1af5fPatch
- https://git.kernel.org/stable/c/d5638de827cff0fce77007e426ec0ffdedf68a44Patch
- https://git.kernel.org/stable/c/758071a35d9f3ffd84ff12169d081412a2f5f098Patch
- https://git.kernel.org/stable/c/c9b732a9f73eadc638abdcf0a6d39bc7a0c1af5fPatch
- https://git.kernel.org/stable/c/d5638de827cff0fce77007e426ec0ffdedf68a44Patch
FAQ
What is CVE-2024-35991?
CVE-2024-35991 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Convert spinlock to mutex to lock evl workqueue drain_workqueue() cannot be called safely in a spinlocked context...
How severe is CVE-2024-35991?
CVE-2024-35991 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-35991?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.