CVE-2026-63823
keys: Pin request_key_auth payload in instantiate paths
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.]
INFO
Published Date :
July 19, 2026, 12:16 p.m.
Last Modified :
July 19, 2026, 12:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-63823
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the provided patch to the Linux kernel.
- Ensure payload references are managed correctly.
- Review related key management code.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63823.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63823 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63823
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63823 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63823 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': 'd8274181b0f28d450b42489723a5ba81042158d7', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': '4982bfabce6b33b3c9eddb4fb900fe5568b7cf91', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': '708709c65a1832a99b0eef8ae46e343ddaca3d06', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': '35ab4db86774d82389e4b9559e26ab7f68d8e395', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': 'f9b68632ac93cc742f2e411021c4dbfe452ea0c2', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': '7216ce8cb12fee44e309503955bb83806b106129', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': '83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f', 'versionType': 'git'}, {'status': 'affected', 'version': 'b5f545c880a2a47947ba2118b2509644ab7a2969', 'lessThan': 'fd15b457a86939c38aa12116adabd8ff686c5e51', 'versionType': 'git'}], 'programFiles': ['include/keys/request_key_auth-type.h', 'security/keys/internal.h', 'security/keys/keyctl.c', 'security/keys/request_key_auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/keys/request_key_auth-type.h', 'security/keys/internal.h', 'security/keys/keyctl.c', 'security/keys/request_key_auth.c'], 'defaultStatus': 'affected'}] 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.] Added Reference https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395 Added Reference https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91 Added Reference https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06 Added Reference https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129 Added Reference https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f Added Reference https://git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7 Added Reference https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2 Added Reference https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51