SB2026081530 - NULL pointer dereference in Linux kernel afs

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74425)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a null pointer dereference in afs_deliver_cb_init_call_back_state3 in the AFS callback handler when processing CB.InitCallBackState3 requests without an attached server record. A remote attacker can send a crafted callback request to cause a denial of service.

The issue occurs when the rxrpc peer is not mapped to a server record for the incoming callback request.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0bd5f2786a878148190b4c7c259d01313d5f2357
• https://git.kernel.org/stable/c/42e3917cdbdc3d35e191c525687a6d5427f237fd
• https://git.kernel.org/stable/c/cc848a080f7a6848dfeef441722419fdcbfe9b8d
• https://git.kernel.org/stable/c/f3cf725cd284b7912d5522babb44721bf38c8887