High 7.0Published Jun 8, 2026

CVE-2026-46309drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise

Updated under an hour ago (Oct 27, 2026, 11:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.0 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-524
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ada7486c5668db542a7d361268df931aca5b726a before 87f9b1528e1ffc1da3615d552c9a06aba5e20b00; from ada7486c5668db542a7d361268df931aca5b726a before fea04cf6f2345bc50f15b6638906c35962b89424; from ada7486c5668db542a7d361268df931aca5b726a before 4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
linux linux_kernel linux:linux_kernel	from 6.18 before 6.18.32; from 6.19 before 7.0.9; 7.1	NVD

References

References

https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00	patch
https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424	patch
https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39	patch
https://access.redhat.com/security/cve/CVE-2026-46309	third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2486468	third-party-advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46309.json	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.