CVE-2026-80576 (GCVE-0-2026-80576)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
Title
drm/amdgpu: reject oversized IBs with per-ring packet limits
Summary
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)
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 6e164ba1057175fb8a370d8e05cbff5c57eac0c8 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 1474f3970d1afd303e12ff14d06808eabb371576 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 07fe270ec07c138a70afe7a81e115a85c35c545c (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < fd37f9dd5b5ab70a46fa7bc76623c0528d602b27 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: reject oversized IBs with per-ring packet limits\n\nOn GFX rings, amdgpu_cs_p2_ib() passed user-supplied ib_bytes through\nto ib-\u003elength_dw without a limit, while ring_emit_ib() encodes length\ninto packet fields. Oversized values can corrupt adjacent control bits\nand destabilize command submission.\n\nAdd a per-ring IB packet size limit helper and reject command\nsubmissions exceeding the corresponding dword limit before IB\nallocation. Use the documented 20-bit limit for GFX/compute/SDMA/VPE,\nand apply the MM fallback limit for other ring types.\n\n(cherry picked from commit 7f48fa2cf62e3fa6c9c3870aa74988f773247e52)"
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The bug is reached only through the AMDGPU_CS DRM ioctl on a local /dev/dri/renderD* render node; amdgpu_cs_p2_ib() takes user-supplied ib_bytes from command-submission chunks during local GPU job setup, with no network, adjacent-radio, or physical-access path to this code.\nAC:L - An attacker fully controls ib_bytes, ring selection, and backing BO mappings in each submit; triggering the flaw only requires one crafted IB chunk with length_dw above the hardware 20-bit packet limit (e.g., \u003e0xFFFFF dwords), with no race or victim-dependent timing.\nPR:L - AMDGPU_CS is registered with DRM_AUTH|DRM_RENDER_ALLOW, so any authenticated render-client process with standard local access to /dev/dri/renderD* (typical render/video group on desktops, gaming PCs, and cloud GPU VMs) can reach amdgpu_cs_ioctl() without real root or init-namespace capabilities.\nUI:N - Exploitation is entirely self-contained in the attacker\u0027s own DRM client (open render node, allocate/map buffers, submit CS); no separate victim action such as opening a file, mounting a filesystem, or clicking a link is required.\nS:C - On GFX/compute rings, ring_emit_ib() ORs ib-\u003elength_dw into the INDIRECT_BUFFER control dword alongside VMID and preempt/valid bits; oversized values spill into those fields, so the GPU can execute IBs under an unintended VMID and perform DMA outside the attacker\u0027s GPU virtual address space, crossing per-client GPU/IOMMU isolation (e.g., multi-tenant cloud GPU).\nC:H - Corrupted VMID and adjacent control bits in the INDIRECT_BUFFER packet can redirect GPU fetches/execution into another client\u0027s GPU-mapped memory, providing a cross-context read primitive beyond the attacker\u0027s own BO mappings, not merely a benign driver error return.\nI:H - The same control-dword overflow can alter VALID/PREEMPT/VMID encoding so the GPU performs writes and command execution in an unintended address space, yielding cross-context memory corruption and a plausible path to arbitrary GPU-visible memory modification or further kernel compromise.\nA:H - Oversized IB lengths also destabilize command submission and can hang or reset GFX/SDMA rings (as noted in the fix and related IGT oversize-packet tests), denying GPU/display availability until driver reset or reboot on affected AMD systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:58.528Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/6e164ba1057175fb8a370d8e05cbff5c57eac0c8"
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          "url": "https://git.kernel.org/stable/c/1474f3970d1afd303e12ff14d06808eabb371576"
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        {
          "url": "https://git.kernel.org/stable/c/07fe270ec07c138a70afe7a81e115a85c35c545c"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd37f9dd5b5ab70a46fa7bc76623c0528d602b27"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80576",
    "datePublished": "2026-08-26T14:37:35.538Z",
    "dateReserved": "2026-08-26T14:34:25.768Z",
    "dateUpdated": "2026-08-27T05:01:58.528Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-01",
      "epss": "0.0012",
      "percentile": "0.02007"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80576\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-26T15:17:13.653\",\"lastModified\":\"2026-08-27T06:17:43.533\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/amdgpu: reject oversized IBs with per-ring packet limits\\n\\nOn GFX rings, amdgpu_cs_p2_ib() passed user-supplied ib_bytes through\\nto ib-\u003elength_dw without a limit, while ring_emit_ib() encodes length\\ninto packet fields. Oversized values can corrupt adjacent control bits\\nand destabilize command submission.\\n\\nAdd a per-ring IB packet size limit helper and reject command\\nsubmissions exceeding the corresponding dword limit before IB\\nallocation. Use the documented 20-bit limit for GFX/compute/SDMA/VPE,\\nand apply the MM fallback limit for other ring types.\\n\\n(cherry picked from commit 7f48fa2cf62e3fa6c9c3870aa74988f773247e52)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d38ceaf99ed015f2a0b9af3499791bd3a3daae21\",\"lessThan\":\"6e164ba1057175fb8a370d8e05cbff5c57eac0c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d38ceaf99ed015f2a0b9af3499791bd3a3daae21\",\"lessThan\":\"1474f3970d1afd303e12ff14d06808eabb371576\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d38ceaf99ed015f2a0b9af3499791bd3a3daae21\",\"lessThan\":\"07fe270ec07c138a70afe7a81e115a85c35c545c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d38ceaf99ed015f2a0b9af3499791bd3a3daae21\",\"lessThan\":\"fd37f9dd5b5ab70a46fa7bc76623c0528d602b27\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07fe270ec07c138a70afe7a81e115a85c35c545c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1474f3970d1afd303e12ff14d06808eabb371576\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e164ba1057175fb8a370d8e05cbff5c57eac0c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd37f9dd5b5ab70a46fa7bc76623c0528d602b27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T06:35:12+00:00",
      "cve": "CVE-2026-80576",
      "id": "CVE-2026-80576",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu: reject oversized IBs with per-ring packet limits",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80576.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.