CVE-2026-89803drm/nouveau: unsubscribe the channel-kill event before the fence context
- 7.8HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: unsubscribe the channel-kill event before the fence context nouveau_channel_del() tears the fence context down first and only drops the channel-kill subscription later, in the middle of the nvif object teardown: if (chan->fence) nouveau_fence(chan->cli->drm)->context_del(chan); ... nvif_object_dtor(&chan->vram); nvif_event_dtor(&chan->kill); The subscribed handler is nouveau_channel_killed(), which calls nouveau_channel_kill() and from there nouveau_fence_context_kill() on chan->fence. A kill event delivered in that window takes fctx->lock and walks fctx->pending on a fence context that context_del() has already freed. Nothing reaches this below Fermi today, because the subscription is gated on FERMI_CHANNEL_GPFIFO and nothing kills a channel there. On Fermi and newer the window is real but narrow, since a kill has to land exactly while the channel is being destroyed. That is reason enough on its own, which is why this carries a Fixes: tag. The last patch in this series subscribes Tesla channels as well; nothing kills those today, so it does not widen the exposure now, but it is the groundwork for a recovery path that would, and the ordering is better fixed before that lands than alongside it. Drop the subscription before anything it depends on is torn down.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 44 days later
· 44 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < 5db663fbff7b88aeeeecaf5220e177e524165101
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < f3830fdd6930e233d727f29eee1617f7e6a0e9e5
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < 1fef7553dc628295c1208a4f2ac2094c62886e5d
- affected ea13e5abf807ea912ce84eef6a1946b9a38c6508 – < 511585987d27d8cb668acebd399fc4deda23404c
- affected 5.6
- unaffected < 5.6
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f (opens in a new tab)
- https://git.kernel.org/stable/c/5db663fbff7b88aeeeecaf5220e177e524165101 (opens in a new tab)
- https://git.kernel.org/stable/c/f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e (opens in a new tab)
- https://git.kernel.org/stable/c/f3830fdd6930e233d727f29eee1617f7e6a0e9e5 (opens in a new tab)
- https://git.kernel.org/stable/c/1fef7553dc628295c1208a4f2ac2094c62886e5d (opens in a new tab)
- https://git.kernel.org/stable/c/511585987d27d8cb668acebd399fc4deda23404c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80403 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89803)Record last updated .