blk-mq: set RQF_USE_SCHED when the operation is known

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98820
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:36 UTC
Updated2026-10-19 10:19:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: blk-mq: set RQF_USE_SCHED when the operation is known The cached requests are allocated for one operation but can be handed out for another. A passthrough command has RQF_USE_SCHED cleared, so using those flags for a subsequent read/write bio will insert it into the scheduler without ->prepare_request() and frees it without ->finish_request(). For kyber, this leaks the domain token acquired at dispatch and stalls the queue. Don't set RQF_USE_SCHED based on the first operation the batch happened to be allocated for. Instead, set it after the request is claimed by an operation. Introduce a helper function, blk_mq_rq_late_init() for this, and absorb blk_mq_rq_time_init() since the two run together.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4b6a5d9cea911424e84107df8c4eb8317938d2cd 790730e4d95de8356a573d4b4864486bba731863 git Not specified
CNA Linux Linux affected 4b6a5d9cea911424e84107df8c4eb8317938d2cd 2c47ebc27fa72078e26177cd458cdaf3006a9685 git Not specified
CNA Linux Linux affected 4b6a5d9cea911424e84107df8c4eb8317938d2cd ab6c756f28c741d704a7c3e04814bfc3adf6f818 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ab6c756f28c741d704a7c3e04814bfc3adf6f818 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c47ebc27fa72078e26177cd458cdaf3006a9685 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/790730e4d95de8356a573d4b4864486bba731863 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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