bfq: Make sure bfqg for which we are queueing requests is online
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.3%
exploitation probability
0.3%top 81% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
bfq: Make sure bfqg for which we are queueing requests is online
Bios queued into BFQ IO scheduler can be associated with a cgroup that
was already offlined. This may then cause insertion of this bfq_group
into a service tree. But this bfq_group will get freed as soon as last
bio associated with it is completed leading to use after free issues for
service tree users. Fix the problem by making sure we always operate on
online bfq_group. If the bfq_group associated with the bio is not
online, we pick the first online parent.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0ddhttps://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0bhttps://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628https://git.kernel.org/stable/c/ccddf8cd411c1800863ed357064e56ceffd356bb