block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 95% 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().
Affected products
Linux · LinuxReferences
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