cve-2024-49854
Vulnerability from cvelistv5
Published
2024-10-21 12:18
Modified
2024-12-19 09:27
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eafPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bdPatch
Impacted products
Vendor Product Version
Linux Linux Version: e0c20d88b7dce85d2703bb6ba77bf359959675cd
Version: de6c5e3a456019d2182e345730e59721714fa0b5
Version: 19f3bec2ac4be329b9bd12b18a989b867618d2d8
Version: 13b3d0e8cb121f99b11918a0d4bcc1ce4647d352
Version: 4780f50ea50cfe8e89fc3747bf3dd155488433bb
Version: 42c306ed723321af4003b2a41bb73728cab54f85
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