keys: Pin request_key_auth payload in instantiate paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63823
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:55 UTC
Updated2026-07-20 15:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: keys: Pin request_key_auth payload in instantiate paths A: request_key() B: KEYCTL_INSTANTIATE_IOV ================ ========================= create auth key store rka in auth key wait for helper get auth key load rka from auth key copy user payload sleep on #PF helper completed detach and free rka destroy auth key wake up use rka->target_key **USE-AFTER-FREE** Give request_key_auth payloads a refcount. Take a payload reference while authkey->sem stabilizes the payload and revocation state. Hold that reference across the instantiate and reject paths. Drop the auth key owning reference from revoke and destroy. [jarkko: Replaced the first two paragraphs of text with an actual concurrency scenario.]

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: 0.001650000 probability, percentile 0.060810000 (date 2026-07-20)

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 d8274181b0f28d450b42489723a5ba81042158d7 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 4982bfabce6b33b3c9eddb4fb900fe5568b7cf91 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 708709c65a1832a99b0eef8ae46e343ddaca3d06 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 35ab4db86774d82389e4b9559e26ab7f68d8e395 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 f9b68632ac93cc742f2e411021c4dbfe452ea0c2 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 7216ce8cb12fee44e309503955bb83806b106129 git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f git Not specified
CNA Linux Linux affected b5f545c880a2a47947ba2118b2509644ab7a2969 fd15b457a86939c38aa12116adabd8ff686c5e51 git Not specified
CNA Linux Linux affected 2.6.16 Not specified
CNA Linux Linux unaffected 2.6.16 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 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/fd15b457a86939c38aa12116adabd8ff686c5e51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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