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CVE-2026-93823

Linux: drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2d9fd0f01550aab4a0a1984b4379e50545906248Also 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15CVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

  • 2d9fd0f01550aab4a0a1984b4379e50545906248LinuxCVE List
  • 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

amdkfd driver needs allocate buffer to return bo metadata to user space. The buffer size is controlled by user currently. It is a potential security issue that hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX allocation/OOM in kernel context.

This patch first finds bo metadata size. If the size is smaller than user provided value drive can safely allocate buffer in kernel space and copy to user space buffer. If not, driver will let user know, not allocate and copy. User will redo with new buffer in user space.

This patch lets driver decide buffer allocation size to avoid potential hostile size from user space.

(cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)

Text from CVE List

Affected versions 10

  • Linuxaffected: 1dde0ea95b782425b95455d487cb44991525a1d1 before d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228CVE List
  • Linuxaffected: 1dde0ea95b782425b95455d487cb44991525a1d1 before a65ccabde6deb95baf9442bd98299e2248884162CVE List
  • Linuxaffected: 1dde0ea95b782425b95455d487cb44991525a1d1 before 2d9fd0f01550aab4a0a1984b4379e50545906248CVE List
  • Linuxaffected: 1dde0ea95b782425b95455d487cb44991525a1d1 before 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15CVE List
  • Linuxaffected: 5.0CVE List
  • Linuxunaffected: all versions before 5.0CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 4