VulnerabilityPublished 6 May 2026Updated 21 Oct 2026

CVE-2026-43191: Linux kernel · drm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51, be43c36ac13d3a158791566c9fe60511022b7a15, 75372d75a4e23783583998ed99d5009d555850da +1

Exploitation evidence

Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51, be43c36ac13d3a158791566c9fe60511022b7a15, 75372d75a4e23783583998ed99d5009d555850da or 02b033e18e08a1d0b53cf540196688c82af60a2f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ec129fa356bea5411cb16833cc5dab32689ea389, < d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51	Fixed in d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51
LinuxLinux	Affected ≥ ec129fa356bea5411cb16833cc5dab32689ea389, < be43c36ac13d3a158791566c9fe60511022b7a15	Fixed in be43c36ac13d3a158791566c9fe60511022b7a15
LinuxLinux	Affected ≥ ec129fa356bea5411cb16833cc5dab32689ea389, < 75372d75a4e23783583998ed99d5009d555850da	Fixed in 75372d75a4e23783583998ed99d5009d555850da
LinuxLinux	Affected ≥ ec129fa356bea5411cb16833cc5dab32689ea389, < 02b033e18e08a1d0b53cf540196688c82af60a2f	Fixed in 02b033e18e08a1d0b53cf540196688c82af60a2f
LinuxLinux	Affected =6.7	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35 [Why] A backport of the change made for DCN401 that addresses an issue where we turn off the PHY PLL when disabling TMDS output, which causes the OTG to remain stuck. The OTG being stuck can lead to a hang in the DCHVM's ability to ACK invalidations when it thinks the HUBP is still on but it's not receiving global sync. The transition to PLL_ON needs to be atomic as there's no guarantee that the thread isn't pre-empted or is able to complete before the IOMMU watchdog times out. [How] Backport the implementation from dcn401 back to dcn35. There's a functional difference in when the eDP output is disabled in dcn401 code so we don't want to utilize it directly.

References

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