dm: limit target bio polling to one shot

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Summary

CVECVE-2026-74392
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:41 UTC
Updated2026-08-15 06:22:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm: limit target bio polling to one shot dm_poll_bio() is the ->poll_bio() callback for a stacked dm device. The caller only knows about the dm queue, so it may decide to do a spinning poll if it thinks a single queue is being polled. Passing those flags unchanged to the mapped clone lets blk_mq_poll() spin on a target queue from inside dm_poll_bio(). With io_uring IOPOLL on a dm-stripe target this can keep a task in dm_poll_bio() -> bio_poll() -> blk_mq_poll() long enough to trigger an RCU CPU stall, before io_uring gets back to io_iopoll_check() and its need_resched() check. Keep dm's ->poll_bio() bounded by forcing one-shot polling for target bios. The caller can invoke dm_poll_bio() again if it wants to keep polling, and it also gets a chance to reap completions or reschedule between passes.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f22ecf9c14c12918e30f2179ef516e99eb8b2e49 6c4ede3b771adbb3bf21ad4e8b8f2f6f6120c4f7 git Not specified
CNA Linux Linux affected f22ecf9c14c12918e30f2179ef516e99eb8b2e49 5aa0f9231cbacade065cedd8e9b5ebd067231171 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6c4ede3b771adbb3bf21ad4e8b8f2f6f6120c4f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5aa0f9231cbacade065cedd8e9b5ebd067231171 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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