CVE-2026-98820 is a vulnerability in Linux Kernel
Published on October 18, 2026
blk-mq: set RQF_USE_SCHED when the operation is known
In 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.
Products Associated with CVE-2026-98820
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Affected Versions
Linux:- Version 4b6a5d9cea911424e84107df8c4eb8317938d2cd and below 790730e4d95de8356a573d4b4864486bba731863 is affected.
- Version 4b6a5d9cea911424e84107df8c4eb8317938d2cd and below 2c47ebc27fa72078e26177cd458cdaf3006a9685 is affected.
- Version 4b6a5d9cea911424e84107df8c4eb8317938d2cd and below ab6c756f28c741d704a7c3e04814bfc3adf6f818 is affected.
- Version 6.1 is affected.
- Before 6.1 is unaffected.
- Version 6.18.56, <= 6.18.* is unaffected.
- Version 7.2.10, <= 7.2.* is unaffected.
- Version 7.3-rc6, <= * is unaffected.