CVE-2022-49411
bfq: Make sure bfqg for which we are queueing requests is online
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Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0dd
- https://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9
- https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b
- https://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881
- https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628
References (6)
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