CVE-2026-80539

Summary

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)

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 070229262ede37d17c4ea596650deb6e5eb5d106affected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 5f46322e0b84af29e10eb951ff45bd6ea40640deaffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 71aa45f7bfe46fbc6f51e7832573ff49b6005feaaffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < e3ee74d6dbbe409eb99546a7b0a02b2782f9021daffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 931cd1d1baeae68e8eb2c23bc1f3d8934dca6241affected
LinuxLinux4.2affected
LinuxLinux0 < 4.2unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.46 <= 6.18.*unaffected
LinuxLinux7.1.10 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References