CVE-2026-98027

{
  "id": "CVE-2026-98027",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:31.340",
  "lastModified": "2026-10-19T10:17:56.653",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR, clobbering the input value before it has been\nlooked at.  That input is the number of entries the caller had room for.\nETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the\nbuffer from the rule_cnt userspace passes in, so once an admin has\ninstalled policy rules any user can ask for fewer slots than there are\nrules and run off the end of the allocation.  A rule_cnt of 0 leaves the\nbuffer pointer NULL and the walk dereferences it.\n\nCount into a local so the caller's limit survives the walk, and stop with\n-EMSGSIZE once it is reached."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/net/dsa/mv88e6xxx/chip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "7e4bfc5f0b66feb22cba821303fc25ca22cd0887",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "01124cd2cf4b71755b1130ac82d78dcfbd5d69e3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "609c4378f212cf580aae02250f1146caf63d873f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "c5b5c52b6524c9fb50def2260baac745c095ec3a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "44cd4674d9aa5bdf793b8a8b481c9e8536ed6070",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "7a683c2b062810bca203e41866389daf387c235b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "cda5ac8fe8ac8e80b1703ebb8c4250726fc19739",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "da7dc87553046a43be1620a783ce3d9f6583d322",
              "lessThan": "b1fffc273112e7284c5b705e186b43b5770cd3d5",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/net/dsa/mv88e6xxx/chip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.4",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.4",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.271",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.222",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.189",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.111",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}