arm64/gcs: Fix error handling in arch_set_shadow_stack_status()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45876
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:01 UTC
Updated2026-06-25 21:11:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: arm64/gcs: Fix error handling in arch_set_shadow_stack_status() alloc_gcs() returns an error-encoded pointer on failure, which comes from do_mmap(), not NULL. The current NULL check fails to detect errors, which could lead to using an invalid GCS address. Use IS_ERR_VALUE() to properly detect errors, consistent with the check in gcs_alloc_thread_stack().

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

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Problem Types: CWE-476

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 b57180c75c7ebff6613886cb69ef6e283a10358b c787a235deb33be6eda40beee8f561da5fd8cb8c git Not specified
CNA Linux Linux affected b57180c75c7ebff6613886cb69ef6e283a10358b a4741114c9622346c4bbb8cc2bbd88153616ffaf git Not specified
CNA Linux Linux affected b57180c75c7ebff6613886cb69ef6e283a10358b 53c998527ffa60f9deda8974a11ad39790684159 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c787a235deb33be6eda40beee8f561da5fd8cb8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a4741114c9622346c4bbb8cc2bbd88153616ffaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/53c998527ffa60f9deda8974a11ad39790684159 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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