EUVD-2026-80497
GHSA-qrqc-48r2-97g7
Severity by source
AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Local CEC device-node access (AV:L/PR:L) and a narrow timing window (AC:H); race UAF is crash-dominant (A:H) with only bounded C/I exposure.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
6DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
media: cec: Serialize exclusive follower delivery
cec_receive_notify() reads the exclusive follower pointer without the adapter lock. Serialize the no-follower check and message delivery against mode changes and release.
AnalysisAI
A race condition in the Linux kernel's HDMI-CEC subsystem (media: cec) lets a local user who can open a CEC adapter character device (/dev/cecN) and register as an exclusive follower race message delivery against follower mode changes or adapter release, reading the follower pointer without the adapter lock and creating a window that can corrupt kernel state or leak data. The assessed vector (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H) confirms this is a local, low-privilege issue requiring an actual CEC-capable adapter and precise timing, not the remote/unauthenticated scenario implied by the vendor's AV:A/PR:N score. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires local access to a CEC adapter character device (/dev/cecN) exposed by a media/HDMI-CEC-capable kernel, plus the ability to register as an exclusive follower and drive concurrent follower mode changes (CEC_S_MODE) or adapter release while CEC messages are being received. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a local kernel race condition (CWE-362) in the HDMI-CEC subsystem, not a remotely reachable flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Linux 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, or 7.3-rc1 (or later on the corresponding stable branch); the upstream fix commits are listed in the git.kernel.org stable references included with this CVE. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Linux-based assets that expose HDMI-CEC adapters and determine which kernel versions are in use, then immediately tighten access to the /dev/cecN device nodes by removing unprivileged accounts from any CEC-capable groups and hardening udev rules or device permissions so only trusted, necessary users can open the adapter. …
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Same technique Denial Of Service
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External POC / Exploit Code
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