dm: clear cloned request bio pointer when last clone bio completes

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Summary

CVECVE-2026-43278
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:49 UTC
Updated2026-05-08 19:38:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm: clear cloned request bio pointer when last clone bio completes Stale rq->bio values have been observed to cause double-initialization of cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios. One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like: nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() // called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() // end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request() blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-released bios.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000120000 probability, percentile 0.017700000 (date 2026-05-11)

Problem Types: CWE-415

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff 8d9ddad561136f7e6a9346767bf97b4d79e38e67 git Not specified
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff 7daf279c674d515fb22a727a7bbc92aeb35c5442 git Not specified
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff e2e738e8dfbbf83bd2bae0467ec4420cc52da42a git Not specified
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff b1c1a2637ebd675aa2d71fee8c70da8791d73850 git Not specified
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff 83d72091804600ead96dc9e9f518ea56cb4942f6 git Not specified
CNA Linux Linux affected ab3e1d3bbab9e973aeb4dd4603251578658a47ff fb8a6c18fb9a6561f7a15b58b272442b77a242dd git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9a95b98202113045bc1a5bcb30388a500f25e050 [email protected] git.kernel.org Patch
git.kernel.org/stable/c/b1c1a2637ebd675aa2d71fee8c70da8791d73850 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e2e738e8dfbbf83bd2bae0467ec4420cc52da42a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7daf279c674d515fb22a727a7bbc92aeb35c5442 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fb8a6c18fb9a6561f7a15b58b272442b77a242dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/83d72091804600ead96dc9e9f518ea56cb4942f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8d9ddad561136f7e6a9346767bf97b4d79e38e67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d746b639be4b4f5cd8ce2b06aa52dc443f50edc [email protected] git.kernel.org Patch
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