FKIE_CVE-2026-98145

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: reject a command chain that carries no commands A chain whose command_count is zero passes the payload length check, because struct_size(payload, data, 0) is just the header. The fill loop then does not run, so offset stays zero and the request is submitted with a zero-length buffer. On firmware without AIE2_NPU_COMMAND that ends at the opcode check, since op is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers MSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers MSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission continues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte before the buffer and faults on the vmap guard page. EXEC_CMD is reachable by any process that can open the render node. Reject the request instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed74e8d603df457bfcf16ed4f8f1660a1525759e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef6d27af71e1dc43181ec797a6aaa77c27c36786
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/aie2_message.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ed74e8d603df457bfcf16ed4f8f1660a1525759e",
              "status": "affected",
              "version": "8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf",
              "versionType": "git"
            },
            {
              "lessThan": "ef6d27af71e1dc43181ec797a6aaa77c27c36786",
              "status": "affected",
              "version": "8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/aie2_message.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: reject a command chain that carries no commands\n\nA chain whose command_count is zero passes the payload length check,\nbecause struct_size(payload, data, 0) is just the header. The fill loop\nthen does not run, so offset stays zero and the request is submitted with\na zero-length buffer.\n\nOn firmware without AIE2_NPU_COMMAND that ends at the opcode check, since\nop is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers\nMSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers\nMSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission\ncontinues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte\nbefore the buffer and faults on the vmap guard page. EXEC_CMD is\nreachable by any process that can open the render node.\n\nReject the request instead."
    }
  ],
  "id": "CVE-2026-98145",
  "lastModified": "2026-09-25T11:17:46.043",
  "metrics": {},
  "published": "2026-09-25T11:17:46.043",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed74e8d603df457bfcf16ed4f8f1660a1525759e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef6d27af71e1dc43181ec797a6aaa77c27c36786"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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