CVE-2026-53143drm/amdkfd: Fix buffer overflow in SDMA queue checkpoint/restore on GFX11

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix buffer overflow in SDMA queue checkpoint/restore on GFX11 The v11 MQD manager incorrectly assigned the CP-compute variants of checkpoint_mqd/restore_mqd for KFD_MQD_TYPE_SDMA queues. These functions use sizeof(struct v11_compute_mqd) (2048 bytes) instead of sizeof(struct v11_sdma_mqd) (512 bytes), causing a 1536-byte overflow. During CRIU checkpoint of an SDMA queue on Navi3x: - checkpoint_mqd() reads 2048 bytes from a 512-byte SDMA MQD buffer, leaking 1536 bytes of adjacent GTT memory to userspace During CRIU restore: - restore_mqd() writes 2048 bytes into a 512-byte SDMA MQD buffer, corrupting 1536 bytes of adjacent GTT memory (often the ring buffer or neighboring MQDs) This is a copy-paste regression unique to v11. All other ASIC backends (cik, vi, v9, v10, v12) correctly use the SDMA-specific variants. Add checkpoint_mqd_sdma() and restore_mqd_sdma() functions that properly handle the smaller v11_sdma_mqd structure, matching the pattern used in other MQD managers. (cherry picked from commit 6fa41db7ffdec97d62433adf03b7b9b759af8c2c)

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/16dad1fb0d783a4008de30e32d0038c393de05b1
• https://git.kernel.org/stable/c/2c5b66c9b4057b385566940935ebc32f6e6ebfd2
• https://git.kernel.org/stable/c/d3efcadfe3eea5b4263b8f2d4463b15c9fc46a64
• https://git.kernel.org/stable/c/d02f05d30f35b036f7cbaf72de634affb5b38ec6
• https://git.kernel.org/stable/c/352ea59028ea48a6fff77f19ae28f98f71946a80
• https://access.redhat.com/security/cve/CVE-2026-53143 vdb-entry, x_refsource_REDHAT
• RHBZ#2492719 issue-tracking, x_refsource_REDHAT
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53143.json x_sadp-csaf-vex
• https://access.redhat.com/errata/RHSA-2026:57251 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:57252 vendor-advisory, x_refsource_REDHAT