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THREATINT
PUBLISHED

CVE-2024-49854

block, bfq: fix uaf for accessing waker_bfqq after splitting



AssignerLinux
Reserved2024-10-21
Published2024-10-21
Updated2024-10-21

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.

Product status

Default status
unaffected

e0c20d88b7dc before 63a07379fdb6
affected

de6c5e3a4560 before de0456460f2a
affected

19f3bec2ac4b before 0780451f03bf
affected

13b3d0e8cb12 before 0b8bda0ff171
affected

4780f50ea50c before cae58d19121a
affected

42c306ed7233 before 1ba0403ac644
affected

Default status
unaffected

References

https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726

https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd

https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f

https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583

https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe

https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf

cve.org CVE-2024-49854

nvd.nist.gov CVE-2024-49854

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