CVE-2022-50329high

CVE-2022-50329: high-severity vulnerability in Linux

block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
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().
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/1425f1bb5df5239021fd09ebc2a5e8070e705d36https://git.kernel.org/stable/c/1ed959fef5b1c6f1a7a3fbea543698c30ebd6678https://git.kernel.org/stable/c/246cf66e300b76099b5dbd3fdd39e9a5dbc53f02https://git.kernel.org/stable/c/7949b0df3dd9f4817ed4a4e989fa9ee81df6205fhttps://git.kernel.org/stable/c/cfe5b38c37720313eff0dec5517442c7ab3c9a20