CVE-2026-63823 - keys: Pin request_key_auth payload in instantiate paths

CVE-2026-63823 - keys: Pin request_key_auth payload in instantiate paths

https://cvefeed.io/rssfeed/latest.atom / Sun, 07/19/2026 - 16:06
CVE ID :CVE-2026-63823
Published : July 19, 2026, 12:16 p.m. | 32 minutes ago
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.]
Severity: 0.0 | NA
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