drm/nouveau: unsubscribe the channel-kill event before the fence context
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.
CVE-2026-89803
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89803
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ea13e5abf807ea912ce84eef6a1946b9a38c6508",
"lessThan": "5db663fbff7b88aeeeecaf5220e177e524165101",
"versionType": "git"
},
{
"status": "affected",
"version": "ea13e5abf807ea912ce84eef6a1946b9a38c6508",
"lessThan": "f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e",
"versionType": "git"
},
{
"status": "affected",
"version": "ea13e5abf807ea912ce84eef6a1946b9a38c6508",
"lessThan": "f3830fdd6930e233d727f29eee1617f7e6a0e9e5",
"versionType": "git"
},
{
"status": "affected",
"version": "ea13e5abf807ea912ce84eef6a1946b9a38c6508",
"lessThan": "1fef7553dc628295c1208a4f2ac2094c62886e5d",
"versionType": "git"
},
{
"status": "affected",
"version": "ea13e5abf807ea912ce84eef6a1946b9a38c6508",
"lessThan": "511585987d27d8cb668acebd399fc4deda23404c",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/nouveau/nouveau_chan.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/nouveau/nouveau_chan.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89803
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48546 · Revision 1
- Added to Heist Feed
- Publisher date