GHSA-V4RC-4368-FVRR
Vulnerability from github – Published: 2026-10-26 15:34 – Updated: 2026-10-26 15:34In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: drain the hangcheck timer and works on V3D unbind
Nothing stops the hangcheck timer that submitted jobs arm, or the job_done_work that the render-done interrupt queues, at teardown: vc4_irq_disable() cancels only overflow_mem_work, and vc4_gem_destroy() runs from the drm-managed release, after vc4_v3d_unbind() has already uninstalled the V3D interrupt and cleared vc4->v3d. A timer still armed by then reads V3D registers through the NULL vc4->v3d pointer, and the late callbacks run on the vc4_dev embedding them after it has been freed.
Drain them in vc4_v3d_unbind(): shut the timer down and cancel reset_work before the interrupt is taken down, because its vc4_irq_reset() re-enables it, then flush job_done_work so that completions queued at teardown still release their jobs.
This issue was found by an in-house static analysis tool.
{
"affected": [],
"aliases": [
"CVE-2026-99095"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-26T15:16:48Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: drain the hangcheck timer and works on V3D unbind\n\nNothing stops the hangcheck timer that submitted jobs arm, or the\njob_done_work that the render-done interrupt queues, at teardown:\nvc4_irq_disable() cancels only overflow_mem_work, and vc4_gem_destroy()\nruns from the drm-managed release, after vc4_v3d_unbind() has already\nuninstalled the V3D interrupt and cleared vc4-\u003ev3d. A timer still armed\nby then reads V3D registers through the NULL vc4-\u003ev3d pointer, and the\nlate callbacks run on the vc4_dev embedding them after it has been\nfreed.\n\nDrain them in vc4_v3d_unbind(): shut the timer down and cancel\nreset_work before the interrupt is taken down, because its\nvc4_irq_reset() re-enables it, then flush job_done_work so that\ncompletions queued at teardown still release their jobs.\n\nThis issue was found by an in-house static analysis tool.",
"id": "GHSA-v4rc-4368-fvrr",
"modified": "2026-10-26T15:34:50Z",
"published": "2026-10-26T15:34:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99095"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/17c5fa371de2d5508755cd4cd227cc8e2bb99240"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/94cf5971b1d04c6382437387c4dc3836cc7a1437"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a046cd60ff3f4a8c8e672b3b18902682c1f91731"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ade226dfd28cf2fd1dce143c556d1ee77d953696"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e61465d3e0292daebf4dbb34e0add635e2439569"
}
],
"schema_version": "1.4.0",
"severity": []
}
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