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CVE-2026-46309 Linux CVE debrief

A vulnerability has been resolved in the Linux kernel, specifically in the drm/xe/uapi component. The vulnerability arises from the use of coh_none PAT index for CPU cached memory in madvise. This can lead to a security issue where the GPU with coh_none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-06-08
Advisory published
2026-06-08
Advisory updated
2026-06-08

Who should care

Users of the Linux kernel, particularly those using the drm/xe/uapi component, should be aware of this vulnerability.

Technical summary

The vulnerability is caused by the lack of validation in xe_vm_madvise_ioctl() for PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory. This can lead to a security issue where sensitive data can be leaked.

Defensive priority

high

Recommended defensive actions

  • Apply the patch from the Linux kernel repository to fix the vulnerability.
  • Use the official CVE record from CVE.org for more information: [cve-org]
  • Check the NVD detail page for more information: [nvd]

Evidence notes

The vulnerability has been resolved in the Linux kernel repository.

Official resources

CVE-2026-46309 was published on 2026-06-08T17:16:49.820Z.