CVE-2026-99090: Linux kernel · drm/amdgpu: serialize vblank counter reads against GPU reset
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 29 Oct 2026, 01:00 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented that serializes vblank counter reads against GPU reset by acquiring the reset semaphore for reading and using a cached software counter during reset. Users should apply the updated Linux kernel versions containing this patch to resolve the issue. No additional mitigation actions are required.
Description
CVE-2026-99090 is a vulnerability in the Linux kernel's amdgpu driver where vblank counter reads are not properly serialized against GPU reset operations. This can cause lockdep warnings and tainting when accessing display hardware during reset. The fix involves acquiring the reset semaphore for reading before hardware access and using a cached software counter if reset is in progress, preventing unsafe hardware reads during reset.
References
- ubuntu.com/security/CVE-2026-99090 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99090 (opens in a new tab)
- git.kernel.org/stable/c/11b6193c8841a052b7907006ffb1e02468b1448e (opens in a new tab)
- git.kernel.org/stable/c/8d6f773d7479034a574ecc3b585bcd07d46b4824 (opens in a new tab)
- git.kernel.org/stable/c/1a6023edfbb5673f55fab6348f135fb3b1428ea5 (opens in a new tab)
- git.kernel.org/stable/c/f4a0a1ce147d1a6e428d7cb5e3b99fd695139fc7 (opens in a new tab)
- git.kernel.org/stable/c/037796d9ca1da97978deaefd88ca5649f6cb69f5 (opens in a new tab)