io_uring/kbuf: check if target buffer list is still legacy on recycle

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Summary

CVECVE-2026-43366
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:47 UTC
Updated2026-05-15 16:15:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

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 0.017490000 (date 2026-05-12)

Problem Types: NVD-CWE-noinfo

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 c7fb19428d67dd0a2a78a4f237af01d39c78dc5a a7b33671e418fca507feebd1d56e7f4952a4b25c git Not specified
CNA Linux Linux affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a 439a6728ec4641ffad1ca796622c19bc525e570f git Not specified
CNA Linux Linux affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa git Not specified
CNA Linux Linux affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a 50ad880db3013c6fee0ef13781762a39e2e7ef83 git Not specified
CNA Linux Linux affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a 97b57f69fee1b61b41acbf37e7720cac9d389fa4 git Not specified
CNA Linux Linux affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a c2c185be5c85d37215397c8e8781abf0a69bec1f git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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