CVE-2026-98309drm/vc4: Use managed KMS polling to fix UAF on unbind
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% 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/vc4: Use managed KMS polling to fix UAF on unbind vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides no matching drm_kms_helper_poll_fini(). The output poll work stays scheduled after unbind and runs on the freed drm_device: # modprobe vc4; rmmod vc4; sleep 10 BUG: KASAN: slab-use-after-free in delayed_work_timer_fn BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm] Workqueue: events output_poll_execute [drm_kms_helper] Allocated by task 171: __devm_drm_dev_alloc Freed by task 262 (rmmod): drm_dev_put / component_del Use drmm_kms_helper_poll_init() so polling is finalized with the device, as other drivers do.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected c8b75bca92cbf064b9fa125fc74a85994452e935 – < b6beee927e7f4e3142032ff91b2d0417cdddc0f6
- affected c8b75bca92cbf064b9fa125fc74a85994452e935 – < cf0c4432bda37b02e7d430ff5017228ceb7caf0c
- affected c8b75bca92cbf064b9fa125fc74a85994452e935 – < ee507691c18f9fee5d4751e295ab9a7ff31d59ae
- affected c8b75bca92cbf064b9fa125fc74a85994452e935 – < 7f9780df677370a19b4ec9764f13b1b82073e0d9
- affected c8b75bca92cbf064b9fa125fc74a85994452e935 – < 073a30d75f309812ed61af134f24ffef4107b13a
- affected 4.4
- unaffected < 4.4
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6 (opens in a new tab)
- https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c (opens in a new tab)
- https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae (opens in a new tab)
- https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9 (opens in a new tab)
- https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a (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-2026-93294 (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-2026-98309)Record last updated .