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PatchSiren cyber security CVE debrief

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
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46309 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46309

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46309 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46309

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.