In the Linux kernel, the following vulnerability has been resolved: keys: Check the authorization payload in process keyring searches An…
CVE-2026-99225
In the Linux kernel, the following vulnerability has been resolved: keys: Check the authorization payload in process keyring searches An authorization payload and its saved credentials must remain valid while searchprocesskeyringsrcu() searches the requestor's keyrings. The function validates the authorization key, then separately loads payload.data[0] and unconditionally reads rka->cred. Validation does not prevent requestkeyauthrevoke() from clearing the payload. A request-key helper can assume authority and fork a descendant that inherits the authorization key. If the descendant misses in its own keyrings, it falls back to the saved requestor credentials. Successful target instantiation invalidates the authorization key without clearing the payload. After the helper exits, UMHWAITPROC returns to the requester, which calls completerequestkey() and revokes that key. With the descendant paused after validation, the paths can interleave as follows: 1. The descendant enters searchprocesskeyringsrcu() under RCU and keyvalidate() succeeds. 2. The helper instantiates the target, invalidates the authorization key, and exits. 3. The requester resumes from UMHWAITPROC, calls…
Assessment
- CVSS
- Not yet scored
- Severity
- Unscored
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 2 November 2026
- Last updated
- 2 November 2026
- Assigner
- Linux
At the source
References
- https://git.kernel.org/stable/c/14fb6fad526b35a7ebd121f1dd313abe652e0aa6
- https://git.kernel.org/stable/c/458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f
- https://git.kernel.org/stable/c/7d3d2fffe933e538472ccafe5bbc7109488b9ce3
- https://git.kernel.org/stable/c/26949c2e4c461e9e620e935bc22717f36a40b615
- https://git.kernel.org/stable/c/984a178d54515779a1bee100b92a6cee8777c830
- https://git.kernel.org/stable/c/b86db7993051d05810601654e886a1e78e1fa495
- https://git.kernel.org/stable/c/b4dfda438fee3c6faa15d9b421c373de6a0e476f
- https://git.kernel.org/stable/c/49f4e768540d25d8852ef750313afda6a4774871
- https://nvd.nist.gov/vuln/detail/CVE-2026-99225
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