CVE-2026-43099 (GCVE-0-2026-43099)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
ipv4: icmp: fix null-ptr-deref in icmp_build_probe()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: fix null-ptr-deref in icmp_build_probe() ipv6_stub->ipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the IPv6 stack is not active (CONFIG_IPV6=m and not loaded), and passing this error pointer to dev_hold() will cause a kernel crash with null-ptr-deref. Instead, silently discard the request. RFC 8335 does not appear to define a specific response for the case where an IPv6 interface identifier is syntactically valid but the implementation cannot perform the lookup at runtime, and silently dropping the request may safer than misreporting "No Such Interface".
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d329ea5bd8845f0b196bf41b18b6173340d6e0e4 , < 47a8bf52156ac7e7a581eca31c1f964ba4258d4d (git)
Affected: d329ea5bd8845f0b196bf41b18b6173340d6e0e4 , < 6be325206850a0891896d38bcf83a09d8b54ec48 (git)
Affected: d329ea5bd8845f0b196bf41b18b6173340d6e0e4 , < f91b3ed9e7fa82a70511b5f6901c88379acf2964 (git)
Affected: d329ea5bd8845f0b196bf41b18b6173340d6e0e4 , < 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 (git)
Affected: d329ea5bd8845f0b196bf41b18b6173340d6e0e4 , < fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/ipv4/icmp.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: icmp: fix null-ptr-deref in icmp_build_probe()\n\nipv6_stub-\u003eipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the\nIPv6 stack is not active (CONFIG_IPV6=m and not loaded), and passing\nthis error pointer to dev_hold() will cause a kernel crash with\nnull-ptr-deref.\n\nInstead, silently discard the request. RFC 8335 does not appear to\ndefine a specific response for the case where an IPv6 interface\nidentifier is syntactically valid but the implementation cannot perform\nthe lookup at runtime, and silently dropping the request may safer than\nmisreporting \"No Such Interface\"."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-06T07:40:29.567Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "ipv4: icmp: fix null-ptr-deref in icmp_build_probe()",
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    "cveId": "CVE-2026-43099",
    "datePublished": "2026-05-06T07:40:29.567Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-05-06T07:40:29.567Z",
    "state": "PUBLISHED"
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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