In 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.]

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395 cve-icon
https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91 cve-icon
https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06 cve-icon
https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129 cve-icon
https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f cve-icon
https://git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7 cve-icon
https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2 cve-icon
https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51 cve-icon
https://lore.kernel.org/linux-cve-announce/2026071906-CVE-2026-63823-4e1e@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-63823 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-63823 cve-icon
History

Tue, 21 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 threat_severity

Moderate

Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Sun, 19 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Description In 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.]
Title keys: Pin request_key_auth payload in instantiate paths
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-19T12:02:19.847Z

Updated: 2026-07-20T13:40:27.567Z

Reserved: 2026-07-19T07:54:57.014Z

Link: CVE-2026-63823

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-19T00:00:00Z

Links: CVE-2026-63823 - Bugzilla