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net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while dumping the policy IDR, clobbering the input value before it has been looked at. That input is the number of entries the caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the buffer from the rule_cnt userspace passes in, so once an admin has installed policy rules any user can ask for fewer slots than there are rules and run off the end of the allocation. A rule_cnt of 0 leaves the buffer pointer NULL and the walk dereferences it. Count into a local so the caller's limit survives the walk, and stop with -EMSGSIZE once it is reached.

Announced Source revision 1
Original source ↗

CVE-2026-98027

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98027

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/net/dsa/mv88e6xxx/chip.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/dsa/mv88e6xxx/chip.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98027

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38152 · Revision 1
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Publisher date
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