CVE-2024-49943: drm/xe/guc_submit: add missing locking in wedged_fini
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/xe/guc_submit: add missing locking in wedged_fini Any non-wedged queue can have a zero refcount here and can be running concurrently with an async queue destroy, therefore dereferencing the queue ptr to check wedge status after the lookup can trigger UAF if queue is not wedged. Fix this by keeping the submission_state lock held around the check to postpone the free and make the check safe, before dropping again around the put() to avoid the deadlock. (cherry picked from commit d28af0b6b9580b9f90c265a7da0315b0ad20bbfd)
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.11<6.11.3 | |
| Linux Kernel | =6.12-rc1 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/d88f9bab7e62dd0dbe983fa70cf040042a60cc84
- https://git.kernel.org/stable/c/790533e44bfc7af929842fccd9674c9f424d4627
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49943
- https://nvd.nist.gov/vuln/detail/CVE-2024-49943
- https://launchpad.net/bugs/cve/CVE-2024-49943
- https://security-tracker.debian.org/tracker/CVE-2024-49943
- https://ubuntu.com/security/CVE-2024-49943
- https://git.kernel.org/linus/790533e44bfc7af929842fccd9674c9f424d4627
Frequently Asked Questions
What is the severity of CVE-2024-49943?
CVE-2024-49943 is classified as a high severity vulnerability in the Linux kernel.
How do I fix CVE-2024-49943?
To mitigate CVE-2024-49943, update your Linux kernel to a patched version that resolves the vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-49943?
CVE-2024-49943 affects Linux kernel versions from 6.11 to 6.11.3 and also 6.12-rc1.
What is the impact of CVE-2024-49943 on system security?
CVE-2024-49943 can lead to potential gains for an attacker due to improper locking mechanisms in kernel processes.
Is a specific Linux distribution vulnerable to CVE-2024-49943?
Yes, Debian and other distributions that use affected kernel versions are vulnerable to CVE-2024-49943.
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