CVE-2025-38511

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm/xe/pf: Clear all LMTT pages on alloc

Our LMEM buffer objects are not cleared by default on alloc and during VF provisioning we only setup LMTT PTEs for the actually provisioned LMEM range. But beyond that valid range we might leave some stale data that could either point to some other VFs allocations or even to the PF pages.

Explicitly clear all new LMTT page to avoid the risk that a malicious VF would try to exploit that gap.

While around add asserts to catch any undesired PTE overwrites and low-level debug traces to track LMTT PT life-cycle.

(cherry picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d)

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb1d20405821812ad70d95eefe58cadc6d50b0917 < ff4b8c9ade1b82979fdd01e6f45b60f92eed26d8affected
LinuxLinuxb1d20405821812ad70d95eefe58cadc6d50b0917 < 5d21892c2e15b6a27f8bc907693eca7c6b7cc269affected
LinuxLinuxb1d20405821812ad70d95eefe58cadc6d50b0917 < 705a412a367f383430fa34bada387af2e52eb043affected
LinuxLinux6.8affected
LinuxLinux0 < 6.8unaffected
LinuxLinux6.12.39 <= 6.12.*unaffected
LinuxLinux6.15.7 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

References