Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe. Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.10.227, < 5.15.168 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7fPatch
- https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583Patch
- https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eafPatch
- https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726Patch
- https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fePatch
- https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bdPatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
FAQ
What is CVE-2024-49854?
CVE-2024-49854 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bf...
How severe is CVE-2024-49854?
CVE-2024-49854 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-49854?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.