Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise Add validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory. Using coh_none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). 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. This aligns with the existing validation in vm_bind path (xe_vm_bind_ioctl_validate_bo). v2(Matthew brost) - Add fixes - Move one debug print to better place v3(Matthew Auld) - Should be drm/xe/uapi - More Cc v4(Shuicheng Lin) - Fix kmem leak issues by the way v5 - Remove kmem leak because it has been merged by another patch v6 - Remove the fix which is not related to current fix v7 - No change v8 - Rebase v9 - Limit the restrictions to iGPU v10 - No change (cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.32 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39Patch
- https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00Patch
- https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424Patch
- https://access.redhat.com/security/cve/CVE-2026-46309Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2486468Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46309.jsonThird Party Advisory
FAQ
What is CVE-2026-46309?
CVE-2026-46309 is a vulnerability with a CVSS score of 7.0 (HIGH). In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise Add validation in xe_vm_madvise_ioctl() to reject PAT indi...
How severe is CVE-2026-46309?
CVE-2026-46309 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46309?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.