CVE-2026-23213: drm/amd/pm: Disable MMIO access during SMU Mode 1 reset
Vulnerability summary
CVE-2026-23213 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 20 · Related 19Timeline
- 18-02-2026PublishedVulnerability first disclosed.
- 30-10-2026Last modifiedVulnerability information updated.
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)
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
Increase +0.06 pp
From 0.12% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 6.8.0-117.117
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1055.58
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < 4027796f024dabb2766afde4f7e772c92bc4d056 | ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < b2b9ac2bb2c5b5b0a39f7f422bbe12d3ea4ccf34 | ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < c1853ebbec980d5c05d431bfd6ded73b1363fd00 | ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162 | ≥ ea8139d8d59bd6f014b317e7423345169a56fe49, < 0de604d0357d0d22cbf03af1077d174b641707b6 | 5.9
- linux_kernel≥ 5.9, < 6.12.70 | ≥ 6.13, < 6.18.10 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
- linuxAll versions (No fix recorded) | < 6.12.73-1 | < 6.18.10-1
3 vendors · 160 products
