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CVE-2026-80576: drm/amdgpu: reject oversized IBs with per-ring packet limits

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-10-30

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)

Affected products

• Linux: 4.2 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/07fe270ec07c138a70afe7a81e115a85c35c545c
• https://git.kernel.org/stable/c/1474f3970d1afd303e12ff14d06808eabb371576
• https://git.kernel.org/stable/c/67a5d905c17a5066b0f6f950da11da93d56d122b
• https://git.kernel.org/stable/c/6e164ba1057175fb8a370d8e05cbff5c57eac0c8
• https://git.kernel.org/stable/c/ecdaefe825555f133a2ef80f39d1ae94d6e1b26a
• https://git.kernel.org/stable/c/fd37f9dd5b5ab70a46fa7bc76623c0528d602b27

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