CVE-2026-80539
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: disallow multiple FENCE chunks in one submit amdgpu_cs_pass1() dispatches on chunk_id once per chunk without rejecting repeated ids. p->uf_bo is a single-slot field, so a submission carrying two AMDGPU_CHUNK_ID_FENCE chunks runs amdgpu_cs_p1_user_fence() twice, and the second run overwrites p->uf_bo with a freshly referenced BO without dropping the reference taken by the first. amdgpu_cs_parser_fini() only unrefs the final p->uf_bo, so every FENCE chunk but the last leaks a BO reference. The leaked BO outlives handle close and process exit. Reject duplicate FENCE chunks the same way commit fec5f8e8c6bc ("drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit") did for p->bo_list. (cherry picked from commit 665b1fc2a1845206408f9a2c6da67101789edb82)
How to fix
- Linux Linux7e9954e7212042ec808b06181b365b14f00c6f0a, 070229262ede37d17c4ea596650deb6e5eb5d106, 5f46322e0b84af29e10eb951ff45bd6ea40640de, 71aa45f7bfe46fbc6f51e7832573ff49b6005fea, e3ee74d6dbbe409eb99546a7b0a02b2782f9021d, 931cd1d1baeae68e8eb2c23bc1f3d8934dca6241 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 7e9954e7212042ec808b06181b365b14f00c6f0a, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 070229262ede37d17c4ea596650deb6e5eb5d106, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 5f46322e0b84af29e10eb951ff45bd6ea40640de, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 71aa45f7bfe46fbc6f51e7832573ff49b6005fea, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < e3ee74d6dbbe409eb99546a7b0a02b2782f9021d, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 931cd1d1baeae68e8eb2c23bc1f3d8934dca6241, 4.2 | 7e9954e7212042ec808b06181b365b14f00c6f0a, 070229262ede37d17c4ea596650deb6e5eb5d106, 5f46322e0b84af29e10eb951ff45bd6ea40640de, 71aa45f7bfe46fbc6f51e7832573ff49b6005fea, e3ee74d6dbbe409eb99546a7b0a02b2782f9021d, 931cd1d1baeae68e8eb2c23bc1f3d8934dca6241 |
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