# drm/nouveau: unsubscribe the channel-kill event before the fence context

CVE record · `CVE-2026-89803`

- **Identifiers:** `CVE-2026-89803`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f` (git)
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before 5db663fbff7b88aeeeecaf5220e177e524165101` (git)
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e` (git)
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before f3830fdd6930e233d727f29eee1617f7e6a0e9e5` (git)
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before 1fef7553dc628295c1208a4f2ac2094c62886e5d` (git)
  - affected: `ea13e5abf807ea912ce84eef6a1946b9a38c6508 to before 511585987d27d8cb668acebd399fc4deda23404c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel versions from commit ea13e5abf807 up to the fixes listed in the advisory (for example ee1cfb1acdff, 5db663fbff7b, f5a79a9ebfba) are affected, as is version 5.6 and later before 5.6's fixed stable branches; kernels 6.1.191, 6.6.160, 6.12.110 and 6.18.51 and later in those series are unaffected. The source gives few details on the attack conditions. A kill event arriving while a Nouveau channel is being destroyed can cause a use-after-free in the kernel's fence handling, on Fermi and newer GPUs. The fix is to upgrade to a patched Linux kernel release; no workaround is listed.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 5th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89803](https://www.cve.org/CVERecord?id=CVE-2026-89803)
- [NVD: CVE-2026-89803](https://nvd.nist.gov/vuln/detail/CVE-2026-89803)

### References from the CNA

- <https://git.kernel.org/stable/c/ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f>
- <https://git.kernel.org/stable/c/5db663fbff7b88aeeeecaf5220e177e524165101>
- <https://git.kernel.org/stable/c/f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e>
- <https://git.kernel.org/stable/c/f3830fdd6930e233d727f29eee1617f7e6a0e9e5>
- <https://git.kernel.org/stable/c/1fef7553dc628295c1208a4f2ac2094c62886e5d>
- <https://git.kernel.org/stable/c/511585987d27d8cb668acebd399fc4deda23404c>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-89803>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89803/>. Everything for agents: <https://agentprime.io/llms.txt>.