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CVE-2026-74657 ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops

🗓️ 22 Aug 2026 15:32:31Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 28 Views

Linux kernel fib_nlmsg_size() underestimates RTA_VIA nexthop size causing kernel panic.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv4/fib_semantics.c"
    ],
    "versions": [
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "57195f0ab5cfbb5ee0864e5aff15ceb48f5a5e28",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "0f0ca602941d0a81ae9514943ca06c55159c6385",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "5307a53599fa762c06e475ee4a375252074fd324",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "7f80ad373ce4a7af5367ff273cea0f16e91387f3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "4a5dfbae5179f6574695012a980476254df2d295",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "a59edda6eda1252340354322d8ab318b2e9052fb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "9b22f13524fa0de0d963bbd3002df6c28bae3395",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d15662682db232da77136cd348f4c9df312ca6f9",
        "lessThan": "4ff9548d84945d2cbf9e4c207288063a200ea397",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv4/fib_semantics.c"
    ],
    "versions": [
      {
        "version": "5.2",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.2",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.267",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.216",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.183",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.152",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.104",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.45",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.9",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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