Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e0c20d88b7dce85d2703bb6ba77bf359959675cd before 63a07379fdb6c72450cb05294461c6016b8b7726; affected de6c5e3a456019d2182e345730e59721714fa0b5 before de0456460f2abf921e356ed2bd8da87a376680bd; affected 19f3bec2ac4be329b9bd12b18a989b867618d2d8 before 0780451f03bf518bc032a7c584de8f92e2d39d7f; affected 13b3d0e8cb121f99b11918a0d4bcc1ce4647d352 before 0b8bda0ff17156cd3f60944527c9d8c9f99f1583; affected 4780f50ea50cfe8e89fc3747bf3dd155488433bb before cae58d19121a70329cf971359e2518c93fec04fe; affected 42c306ed723321af4003b2a41bb73728cab54f85 before 1ba0403ac6447f2d63914fb760c44a3b19c44eaf; affected 9e813033594b141f61ff0ef0cfaaef292564b041; affected 3a5f45a4ad4e1fd36b0a998eef03d76a4f02a2a8; affected 3630a18846c7853aa326d3b42fd0a855af7b41bc; affected 4.19.323 before 4.20; affected 5.4.285 before 5.5; affected 5.10.227 before 5.11 |
| Linux / Linux | unaffected |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.