drm/amdgpu: validate CP_GFX_SHADOW chunk size in CS pass1
Summary
| CVE | CVE-2026-68272 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 13:20:16 UTC |
| Updated | 2026-08-17 05:18:29 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: validate CP_GFX_SHADOW chunk size in CS pass1 Add a minimum-length check for the AMDGPU_CHUNK_ID_CP_GFX_SHADOW chunk in amdgpu_cs_pass1(), matching the gate already present for the IB, FENCE and BO_HANDLES chunk types. The CP_GFX_SHADOW case previously shared a bare break with the dependency and syncobj chunk types, which do not dereference a fixed-size struct. When userspace submits this chunk with length_dw == 0, vmemdup_array_user() is called with size 0 and returns ZERO_SIZE_PTR, which passes the IS_ERR() check. amdgpu_cs_p2_shadow() then dereferences chunk->kdata as a struct drm_amdgpu_cs_chunk_cp_gfx_shadow (reading shadow->flags), faulting on the ZERO_SIZE_PTR and causing a NULL-pointer dereference. This is reachable by an unprivileged process in the render group. Reject undersized chunks with -EINVAL during pass1 so the bad submission is rejected before pass2 ever dereferences the data. (cherry picked from commit 7f61b2eef7415eccdb40850aca0de94211948657) |
Risk And Classification
EPSS: 0.001750000 probability, percentile 0.073200000 (date 2026-08-17)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ac9287055ff16a092416c76a19006764e4c6a978 3f190956404da55560056ce20606010e18bc059c git | Not specified |
| CNA | Linux | Linux | affected ac9287055ff16a092416c76a19006764e4c6a978 2aa9ea2bd5146d237c8cc16d8737d878b0298a94 git | Not specified |
| CNA | Linux | Linux | affected ac9287055ff16a092416c76a19006764e4c6a978 315d2e5741a81b0be763e80413a2677e22b7e596 git | Not specified |
| CNA | Linux | Linux | affected ac9287055ff16a092416c76a19006764e4c6a978 24668ca3ec19434d7a9574bf9112f2b0614c3a4e git | Not specified |
| CNA | Linux | Linux | affected ac9287055ff16a092416c76a19006764e4c6a978 84c4c36acd5c4b2558b5069f869a165b2c655c84 git | Not specified |
| CNA | Linux | Linux | affected 6.5 | Not specified |
| CNA | Linux | Linux | unaffected 6.5 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/2aa9ea2bd5146d237c8cc16d8737d878b0298a94 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/84c4c36acd5c4b2558b5069f869a165b2c655c84 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/24668ca3ec19434d7a9574bf9112f2b0614c3a4e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3f190956404da55560056ce20606010e18bc059c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/315d2e5741a81b0be763e80413a2677e22b7e596 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.