{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/idxd/submit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e21da2ad8844585040fe4b82be1ad2fe99d40074",
              "status": "affected",
              "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87",
              "versionType": "git"
            },
            {
              "lessThan": "82656e8daf8de00935ae91b91bed43f4d6e0d644",
              "status": "affected",
              "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87",
              "versionType": "git"
            },
            {
              "lessThan": "0e4f43779d550e559be13a5cdb763bad92c4cc99",
              "status": "affected",
              "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87",
              "versionType": "git"
            },
            {
              "lessThan": "e1c9866173c5f8521f2d0768547a01508cb9ff27",
              "status": "affected",
              "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/idxd/submit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()\n\nAt the end of this function, d is the traversal cursor of flist, but the\ncode completes found instead. This can lead to issues such as NULL pointer\ndereferences, double completion, or descriptor leaks.\n\nFix this by completing d instead of found in the final\nlist_for_each_entry_safe() loop."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - In a reasonable network-facing deployment, XFRM/IPComp packets can reach `ipcomp_input()` and `crypto_acomp_decompress()`, which can use the IAA `deflate` acomp implementation and submit idxd descriptors. This makes the vulnerable idxd completion-abort path reachable from network traffic.\nAC:L - The vulnerable path requires an interrupt-completion shared workqueue and an `ENQCMDS` failure, but under that deployment the attacker can drive concurrent compression/decompression requests to create WQ pressure. No uncontrollable race or precise timing is required beyond triggering descriptor submission failure under load.\nPR:N - For the network IPComp path, the attacker only needs to send packets to an already configured endpoint and does not need a local account or kernel capability. Administrative setup of the transform/workqueue is treated as deployment configuration, not attacker privilege.\nUI:N - No victim interaction is needed once the vulnerable network-facing configuration is active. Packets or repeated requests can trigger the descriptor submission and abort path directly.\nS:U - The bug corrupts or crashes kernel-owned idxd/dmaengine state within the same kernel security authority. It does not by itself demonstrate a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - Completing the wrong descriptor can cause double completion and premature descriptor reuse, creating UAF/type-confusion-like corruption of kernel request and callback state. Following the high-severity rule for such memory corruption, kernel memory disclosure is defensible.\nI:H - Wrong descriptor completion can recycle an in-flight descriptor and later complete or reuse it for another request, corrupting DMA/crypto request state and potentially enabling control-flow or data corruption. When uncertain, this is scored as high integrity impact.\nA:H - The fix commit explicitly identifies possible NULL pointer dereferences, double completion, and descriptor leaks. These can crash or hang kernel workqueue processing, giving high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:33.386Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e21da2ad8844585040fe4b82be1ad2fe99d40074"
        },
        {
          "url": "https://git.kernel.org/stable/c/82656e8daf8de00935ae91b91bed43f4d6e0d644"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e4f43779d550e559be13a5cdb763bad92c4cc99"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1c9866173c5f8521f2d0768547a01508cb9ff27"
        }
      ],
      "title": "dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31436",
    "datePublished": "2026-04-22T13:53:35.693Z",
    "dateReserved": "2026-03-09T15:48:24.089Z",
    "dateUpdated": "2026-08-05T12:22:33.386Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}