CVE-2026-80576
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: reject oversized IBs with per-ring packet limits On GFX rings, amdgpu_cs_p2_ib() passed user-supplied ib_bytes through to ib->length_dw without a limit, while ring_emit_ib() encodes length into packet fields. Oversized values can corrupt adjacent control bits and destabilize command submission. Add a per-ring IB packet size limit helper and reject command submissions exceeding the corresponding dword limit before IB allocation. Use the documented 20-bit limit for GFX/compute/SDMA/VPE, and apply the MM fallback limit for other ring types. (cherry picked from commit 7f48fa2cf62e3fa6c9c3870aa74988f773247e52)
How to fix
- Linux Linuxecdaefe825555f133a2ef80f39d1ae94d6e1b26a, 67a5d905c17a5066b0f6f950da11da93d56d122b, 6e164ba1057175fb8a370d8e05cbff5c57eac0c8, 1474f3970d1afd303e12ff14d06808eabb371576, 07fe270ec07c138a70afe7a81e115a85c35c545c, fd37f9dd5b5ab70a46fa7bc76623c0528d602b27 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < ecdaefe825555f133a2ef80f39d1ae94d6e1b26a, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 67a5d905c17a5066b0f6f950da11da93d56d122b, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 6e164ba1057175fb8a370d8e05cbff5c57eac0c8, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 1474f3970d1afd303e12ff14d06808eabb371576, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < 07fe270ec07c138a70afe7a81e115a85c35c545c, d38ceaf99ed015f2a0b9af3499791bd3a3daae21 ≤ v < fd37f9dd5b5ab70a46fa7bc76623c0528d602b27, 4.2 | ecdaefe825555f133a2ef80f39d1ae94d6e1b26a, 67a5d905c17a5066b0f6f950da11da93d56d122b, 6e164ba1057175fb8a370d8e05cbff5c57eac0c8, 1474f3970d1afd303e12ff14d06808eabb371576, 07fe270ec07c138a70afe7a81e115a85c35c545c, fd37f9dd5b5ab70a46fa7bc76623c0528d602b27 |
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