Answer in brief
CVE-2026-89803 records a High severity (CVSS 7.8) vulnerability in drm/nouveau: unsubscribe the channel-kill event before the fence context. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f3830fdd6930e233d727f29eee1617f7e6a0e9e5 || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <1fef7553dc628295c1208a4f2ac2094c62886e5d || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <511585987d27d8cb668acebd399fc4deda23404c | f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e, f3830fdd6930e233d727f29eee1617f7e6a0e9e5, 1fef7553dc628295c1208a4f2ac2094c62886e5d, 511585987d27d8cb668acebd399fc4deda23404c |
| Linux/Linuxgeneric | 5.6 | Not reported |
| Linux/Linuxgeneric | >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <5db663fbff7b88aeeeecaf5220e177e524165101 || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f3830fdd6930e233d727f29eee1617f7e6a0e9e5 || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <1fef7553dc628295c1208a4f2ac2094c62886e5d || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <511585987d27d8cb668acebd399fc4deda23404c | 5db663fbff7b88aeeeecaf5220e177e524165101, f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e, f3830fdd6930e233d727f29eee1617f7e6a0e9e5, 1fef7553dc628295c1208a4f2ac2094c62886e5d, 511585987d27d8cb668acebd399fc4deda23404c |
| Linux/Linuxgeneric | >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <5db663fbff7b88aeeeecaf5220e177e524165101 || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <f3830fdd6930e233d727f29eee1617f7e6a0e9e5 || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <1fef7553dc628295c1208a4f2ac2094c62886e5d || >=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <511585987d27d8cb668acebd399fc4deda23404c | ee1cfb1acdff3fe3b47de7c536e5c77443c8e74f, 5db663fbff7b88aeeeecaf5220e177e524165101, f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e, f3830fdd6930e233d727f29eee1617f7e6a0e9e5, 1fef7553dc628295c1208a4f2ac2094c62886e5d, 511585987d27d8cb668acebd399fc4deda23404c |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.