CVE-2026-63823keys: Pin request_key_auth payload in instantiate paths
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.]
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b5f545c880a2a47947ba2118b2509644ab7a2969 before d8274181b0f28d450b42489723a5ba81042158d7; from b5f545c880a2a47947ba2118b2509644ab7a2969 before 4982bfabce6b33b3c9eddb4fb900fe5568b7cf91; from b5f545c880a2a47947ba2118b2509644ab7a2969 before 708709c65a1832a99b0eef8ae46e343ddaca3d06; from b5f545c880a2a47947ba2118b2509644ab7a2969 before 35ab4db86774d82389e4b9559e26ab7f68d8e395; from b5f545c880a2a47947ba2118b2509644ab7a2969 before f9b68632ac93cc742f2e411021c4dbfe452ea0c2; from b5f545c880a2a47947ba2118b2509644ab7a2969 before 7216ce8cb12fee44e309503955bb83806b106129; from b5f545c880a2a47947ba2118b2509644ab7a2969 before 83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f; from b5f545c880a2a47947ba2118b2509644ab7a2969 before fd15b457a86939c38aa12116adabd8ff686c5e51 | CNA record |
References
- https://git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7
- https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91
- https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06
- https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395
- https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2
- https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129
- https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f
- https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.