VulnerabilityPublished 18 Feb 2026Updated 21 Oct 2026

CVE-2026-23213: Linux kernel · drm/amd/pm: Disable MMIO access during SMU Mode 1 reset

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162 : 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 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162, c1853ebbec980d5c05d431bfd6ded73b1363fd00, b2b9ac2bb2c5b5b0a39f7f422bbe12d3ea4ccf34 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Feb 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 cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162, c1853ebbec980d5c05d431bfd6ded73b1363fd00, b2b9ac2bb2c5b5b0a39f7f422bbe12d3ea4ccf34 or 0de604d0357d0d22cbf03af1077d174b641707b6.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162	Fixed in cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162
LinuxLinux	Affected ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < c1853ebbec980d5c05d431bfd6ded73b1363fd00	Fixed in c1853ebbec980d5c05d431bfd6ded73b1363fd00
LinuxLinux	Affected ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < b2b9ac2bb2c5b5b0a39f7f422bbe12d3ea4ccf34	Fixed in b2b9ac2bb2c5b5b0a39f7f422bbe12d3ea4ccf34
LinuxLinux	Affected ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < 0de604d0357d0d22cbf03af1077d174b641707b6	Fixed in 0de604d0357d0d22cbf03af1077d174b641707b6
LinuxLinux	Affected =5.9	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/pm: Disable MMIO access during SMU Mode 1 reset During Mode 1 reset, the ASIC undergoes a reset cycle and becomes temporarily inaccessible via PCIe. Any attempt to access MMIO registers during this window (e.g., from interrupt handlers or other driver threads) can result in uncompleted PCIe transactions, leading to NMI panics or system hangs. To prevent this, set the `no_hw_access` flag to true immediately after triggering the reset. This signals other driver components to skip register accesses while the device is offline. A memory barrier `smp_mb()` is added to ensure the flag update is globally visible to all cores before the driver enters the sleep/wait state. (cherry picked from commit 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)

References

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