CVE-2026-46309 is a vulnerability in Linux Kernel
Published on June 8, 2026
drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise
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)
Products Associated with CVE-2026-46309
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version ada7486c5668db542a7d361268df931aca5b726a and below 87f9b1528e1ffc1da3615d552c9a06aba5e20b00 is affected.
- Version ada7486c5668db542a7d361268df931aca5b726a and below fea04cf6f2345bc50f15b6638906c35962b89424 is affected.
- Version ada7486c5668db542a7d361268df931aca5b726a and below 4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.32, <= 6.18.* is unaffected.
- Version 7.0.9, <= 7.0.* is unaffected.
- Version 7.1-rc2, <= * is unaffected.