CVE-2026-93823: Linux kernel · drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 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 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther 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 patch has been applied to the Linux kernel amdkfd driver to fix this vulnerability by letting the driver decide the buffer allocation size internally. Users should update to a kernel version including this fix. Since this is a kernel-level fix, upgrading the affected kernel versions is the recommended remediation.
Description
A vulnerability in the Linux kernel's amdkfd driver allowed user space to control the buffer size for the AMDKFD_IOC_GET_DMABUF_INFO ioctl call. This could enable a malicious user to request an excessively large buffer (e.g., 2 GiB), potentially causing an out-of-memory condition in kernel context. The issue was fixed by changing the driver to determine the buffer size internally and only allocate the appropriate amount, preventing user-controlled large allocations.
References
- ubuntu.com/security/CVE-2026-93823 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93823 (opens in a new tab)
- git.kernel.org/stable/c/2d9fd0f01550aab4a0a1984b4379e50545906248 (opens in a new tab)
- git.kernel.org/stable/c/8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15 (opens in a new tab)
- git.kernel.org/stable/c/a65ccabde6deb95baf9442bd98299e2248884162 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93823 (opens in a new tab)
- git.kernel.org/stable/c/d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228 (opens in a new tab)