CVE-2022-49411
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.29% probability · 21th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0ddPatch
- https://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9Patch
- https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0bPatch
- https://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881Patch
- https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628Patch
- https://git.kernel.org/stable/c/ccddf8cd411c1800863ed357064e56ceffd356bbPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.