#VU124911 NULL pointer dereference in Linux kernel - CVE-2026-23460
Published: April 6, 2026
Vulnerability identifier: #VU124911
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23460
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in rose_transmit_link in the ROSE socket implementation when closing a socket after a second connect() call is issued while the first connection attempt is still in progress. A local user can trigger repeated connect() calls and then close the socket to cause a denial of service.
The issue occurs when the socket is in TCP_SYN_SENT state and the reconnect path leaves rose->state as ROSE_STATE_1 with rose->neighbour set to NULL before the close path reaches rose_transmit_link().
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/0c3e8bff808f17ad37a51d8e719eed22c7863120
- https://git.kernel.org/stable/c/0c9fb70a206a8734e10468ecc24d57c7596cf64e
- https://git.kernel.org/stable/c/508f49ccbe0329641bb681f7d0052bb4e5943252
- https://git.kernel.org/stable/c/a12254050e3050f1011cd24f3b880a6882d0139d
- https://git.kernel.org/stable/c/c2ab74c12932e52cfa1e7e4582d42b0c8bec96c7
- https://git.kernel.org/stable/c/e1f0a18c9564cdb16523c802e2c6fe5874e3d944