SB2026081515 - NULL pointer dereference in Linux kernel rxrpc
Published: August 15, 2026
Security Bulletin ID
SB2026081515
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-74435)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in rxrpc_verify_data in net/rxrpc/recvmsg.c when processing RxRPC message data with an unallocated decode buffer. A local user can trigger a call path that reaches skb_copy_bits() with a NULL destination to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d
- https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c
- https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948
- https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44
- https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540