x86: shadow stacks: proper error handling for mmap lock

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Summary

CVECVE-2026-43109
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:24 UTC
Updated2026-05-11 17:25:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86: shadow stacks: proper error handling for mmap lock 김영민 reports that shstk_pop_sigframe() doesn't check for errors from mmap_read_lock_killable(), which is a silly oversight, and also shows that we haven't marked those functions with "__must_check", which would have immediately caught it. So let's fix both issues.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 7fad2a432cd35bbf104d2d9d426e74902f22aa95 c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 git Not specified
CNA Linux Linux affected 7fad2a432cd35bbf104d2d9d426e74902f22aa95 262b6d38a81d51b135db81e1f30c13d30e38feee git Not specified
CNA Linux Linux affected 7fad2a432cd35bbf104d2d9d426e74902f22aa95 52f657e34d7b21b47434d9d8b26fa7f6778b63a0 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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