block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().
02 / AFFECTED SOFTWARE
Affected packages
3 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1425f1bb5df5239021fd09ebc2a5e8070e705d36
- https://git.kernel.org/stable/c/1ed959fef5b1c6f1a7a3fbea543698c30ebd6678
- https://git.kernel.org/stable/c/246cf66e300b76099b5dbd3fdd39e9a5dbc53f02
- https://git.kernel.org/stable/c/7949b0df3dd9f4817ed4a4e989fa9ee81df6205f
- https://git.kernel.org/stable/c/cfe5b38c37720313eff0dec5517442c7ab3c9a20
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50329.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-50329