VulnerabilityPublished 8 May 2026Updated 6 Nov 2026

CVE-2026-43305: Linux kernel · drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path

Affects Linux kernelSource CVE Database V5

Not known to be exploited : upgrade to af3303970da5ce5bfe6dffdd07f38f42aad603e0 or 4e387ad67efb100b645630ffbce7716786f52283 when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in af3303970da5ce5bfe6dffdd07f38f42aad603e0, 4e387ad67efb100b645630ffbce7716786f52283

Exploitation evidence

Disclosed: evidence found.
CVE published 8 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to af3303970da5ce5bfe6dffdd07f38f42aad603e0 or 4e387ad67efb100b645630ffbce7716786f52283.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7d041982fe11fff29b32a09228c4d52f159b56ad, < af3303970da5ce5bfe6dffdd07f38f42aad603e0	Fixed in af3303970da5ce5bfe6dffdd07f38f42aad603e0
LinuxLinux	Affected ≥ 7d041982fe11fff29b32a09228c4d52f159b56ad, < 4e387ad67efb100b645630ffbce7716786f52283	Fixed in 4e387ad67efb100b645630ffbce7716786f52283
LinuxLinux	Affected =6.19	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path [Why] The evaluation for whether we need to use the DMUB HW lock isn't the same as whether we need to unlock which results in a hang when the fast path is used for ASIC without FAMS support. [How] Store a flag that indicates whether we should use the lock and use that same flag to specify whether unlocking is needed.

References

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