VulnerabilityPublished 24 Sep 2026Updated 30 Oct 2026

CVE-2026-93823: Linux kernel · drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:50 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228, d298c100796b2cd1e7e75f8e615b79d034e510f8, a65ccabde6deb95baf9442bd98299e2248884162 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1dde0ea95b782425b95455d487cb44991525a1d1, < d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228	Fixed in d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228
LinuxLinux	Affected ≥ 1dde0ea95b782425b95455d487cb44991525a1d1, < d298c100796b2cd1e7e75f8e615b79d034e510f8	Fixed in d298c100796b2cd1e7e75f8e615b79d034e510f8
LinuxLinux	Affected ≥ 1dde0ea95b782425b95455d487cb44991525a1d1, < a65ccabde6deb95baf9442bd98299e2248884162	Fixed in a65ccabde6deb95baf9442bd98299e2248884162
LinuxLinux	Affected ≥ 1dde0ea95b782425b95455d487cb44991525a1d1, < 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15	Fixed in 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15
LinuxLinux	Affected ≥ 1dde0ea95b782425b95455d487cb44991525a1d1, < 2d9fd0f01550aab4a0a1984b4379e50545906248	Fixed in 2d9fd0f01550aab4a0a1984b4379e50545906248
LinuxLinux	Affected =5.0	Fixed in–

AI-suggested

This vulnerability has been fixed in the Linux kernel by patches that let the driver decide the buffer allocation size internally, preventing user-controlled large allocations. Users should update to a Linux kernel version that includes the fix identified by the commits d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228, d298c100796b2cd1e7e75f8e615b79d034e510f8, a65ccabde6deb95baf9442bd98299e2248884162, 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15, or 2d9fd0f01550aab4a0a1984b4379e50545906248. No additional mitigation is required once patched.

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 has been fixed by changing the driver to determine the buffer size internally and only allocate if safe, informing the user otherwise.

Impact

A malicious user with render-group privileges could cause a denial of service by triggering excessive kernel memory allocation, potentially leading to an out-of-memory condition and impacting system stability or availability.

Summary

The Linux kernel amdkfd driver previously allowed user-controlled buffer size allocation for the AMDKFD_IOC_GET_DMABUF_INFO ioctl, which could be exploited by a hostile user to trigger large memory allocations (up to 2 GiB) in kernel space, leading to out-of-memory (OOM) conditions. The patch changes the driver behavior to first calculate the required buffer size internally and only allocate if it is smaller than the user-provided size. If the required size exceeds the user buffer, the driver informs the user to retry with a larger buffer, preventing uncontrolled kernel memory allocation.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Oct 2026, 12:50 UTC

Technical details

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