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CVE-2026-74656 ipv4: fix use-after-free in fib_nhc_update_mtu()

🗓️ 22 Aug 2026 15:32:30Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 30 Views

Use-after-free in Linux kernel ipv4 fib_nhc_update_mtu() due to missing fnhe_lock during RCU walk.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "include/net/route.h",
      "net/ipv4/fib_semantics.c",
      "net/ipv4/route.c"
    ],
    "versions": [
      {
        "version": "af7d6cce53694a88d6a1bb60c9a239a6a5144459",
        "lessThan": "fd39e711866498ae94fcf9acf6f422a4f045b681",
        "status": "affected",
        "versionType": "git"
      },
      {
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        "lessThan": "e1e602d6b22d5cb1641c4459c487eb18bf569e0a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "af7d6cce53694a88d6a1bb60c9a239a6a5144459",
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      },
      {
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      },
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      {
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      },
      {
        "version": "3.16.62",
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        "status": "affected",
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      },
      {
        "version": "4.4.162",
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      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "include/net/route.h",
      "net/ipv4/fib_semantics.c",
      "net/ipv4/route.c"
    ],
    "versions": [
      {
        "version": "4.19",
        "status": "affected"
      },
      {
        "version": "0",
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        "status": "unaffected",
        "versionType": "semver"
      },
      {
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      },
      {
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        "versionType": "semver"
      },
      {
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      },
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      },
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      },
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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