CVE-2026-43463 rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer()

What is CVE-2026-43463?

CVE-2026-43463 is a medium-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer()

rxrpc_kernel_lookup_peer() can also return error pointers in addition to NULL, so just checking for NULL is not sufficient.

Fix this by:

(1) Changing rxrpc_kernel_lookup_peer() to return -ENOMEM rather than NULL on allocation failure.

(2) Making the callers in afs use IS_ERR() and PTR_ERR() to pass on the error code returned.

Weakness: CWE-476

Which versions are affected by CVE-2026-43463?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43463?

Apply the vendor's patch.

Is CVE-2026-43463 being exploited?

There is no known exploitation of CVE-2026-43463 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43463, DEBIAN-CVE-2026-43463, GHSA-qc73-3qqx-fc2q, ROOT-OS-DEBIAN-13-CVE-2026-43463, ROOT-OS-UBUNTU-2404-CVE-2026-43463, UBUNTU-CVE-2026-43463.