NetSight
IP …
high7.8

CVE-2026-63823

In the Linux kernel, the following vulnerability has been resolved: keys: Pin request_key_auth payload in instantiate paths A: request_key() B: KEYCTL_INSTANTI…

Impact

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.]

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 2.6.16 before 5.10.260
from 5.11 before 5.15.211
from 5.16 before 6.1.177
from 6.2 before 6.6.144
from 6.7 before 6.12.95
from 6.13 before 6.18.38

Weakness classification

CWE-416

References