Use-after-free in Linux kernel - CVE-2026-45866
Published: May 28, 2026
Vulnerability identifier: #VU132630
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45866
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the caif_serial line discipline close handler and transmit path when processing packet transmission during line discipline shutdown. A local user can send crafted packets during the race window to cause a denial of service.
The issue is triggered by a race condition between ldisc_close() and packet transmission in handle_tx().
How to mitigate CVE-2026-45866
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/308e7e4d0a846359685f40aade023aee7b27284c
- https://git.kernel.org/stable/c/331e2b7051635780edea248dd08ae2026c126f4a
- https://git.kernel.org/stable/c/40962f2bf8cdba63af23aec95ad3f49b689e58e2
- https://git.kernel.org/stable/c/4e63d6f68544ae5269ac9735ae5b69b59b5b8725
- https://git.kernel.org/stable/c/52731ef4438155cea782fac74e547a327ab9e7c5
- https://git.kernel.org/stable/c/5e266ba8d330d3b8e5bc198f238cd8901826cfa1
- https://git.kernel.org/stable/c/c8c197aaa56b25a2d54f3aa07e27e228d6c08546
- https://git.kernel.org/stable/c/d3c75db4e0460641dbcd274b40867e252d801da1