CVE-2026-64114 (GCVE-0-2026-64114)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
ipv4: raw: reject IP_HDRINCL packets with ihl < 5
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 raw_send_hdrinc() validates that the caller-supplied IPv4 header fits within the message length: iphlen = iph->ihl * 4; err = -EINVAL; if (iphlen > length) goto error_free; if (iphlen >= sizeof(*iph)) { /* fix up saddr, tot_len, id, csum, transport_header */ } It does not, however, reject ihl < 5. For such a packet the "if (iphlen >= sizeof(*iph))" branch is skipped, leaving the crafted iphdr untouched, but the packet is still handed to __ip_local_out() and onward. Downstream consumers that read iph->ihl assume a sane value: net/ipv4/ah4.c:ah_output() in particular subtracts sizeof(struct iphdr) from top_iph->ihl * 4 and passes the (signed-int-negative, then cast to size_t) result to memcpy(), producing an OOB access of length close to SIZE_MAX and a host kernel panic. An IPv4 header with ihl < 5 is malformed by definition (RFC 791: "Internet Header Length is the length of the internet header in 32 bit words ... Note that the minimum value for a correct header is 5."). The kernel should not be willing to inject such a packet into its own output path. Reject "iphlen < sizeof(*iph)" alongside the existing "iphlen > length" check. This matches the principle that locally constructed packets that re-enter the IP stack must pass the same basic sanity tests that a foreign packet would be subjected to. Once this lands, the "if (iphlen >= sizeof(*iph))" wrapper around the fixup branch becomes redundant; left in place to keep the patch minimal and backport-friendly. A follow-up can unwrap it. Note that commit 86f4c90a1c5c ("ipv4, ipv6: ensure raw socket message is big enough to hold an IP header") ensures the message buffer is large enough to hold an iphdr, but does not constrain the self-reported iph->ihl. Reachability: the malformed packet source is any caller with CAP_NET_RAW, including an unprivileged process in a user+net namespace on a kernel with CONFIG_USER_NS=y. The reproduced AH crash also requires a matching xfrm AH policy on the outgoing route; a container granted CAP_NET_ADMIN can install that state and policy in its netns. Loopback bypasses xfrm_output, so the trigger uses a real netdev. Reproduced on UML + KASAN: kernel-mode fault at addr 0x0 with memcpy_orig at the crash site. Same shape reproduces inside a rootless Docker container with --cap-add NET_ADMIN on a stock distro kernel.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1065b9efa4126df559b03a849c139ecfae92cd25 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bc20dbd48c26e743f7e0845020c11ed2ce8b15ee (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5a564f737ec54d63e8ee221d3ff396d07586d464 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3c5411fa4944ed99af3d9d1de750ea8169b6dac9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 145e9afa5b905229b4788bb72c3255f5a5f77508 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7725cd3b471740fd23d25ed1da722c671fb2a5d3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bbe0be67de296176e7243c76e3d9f02f6ae9ff0b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 915fab69823a14c170dbaa3b41978768e0fe62fc (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: raw: reject IP_HDRINCL packets with ihl \u003c 5\n\nraw_send_hdrinc() validates that the caller-supplied IPv4 header\nfits within the message length:\n\n    iphlen = iph-\u003eihl * 4;\n    err = -EINVAL;\n    if (iphlen \u003e length)\n        goto error_free;\n\n    if (iphlen \u003e= sizeof(*iph)) {\n        /* fix up saddr, tot_len, id, csum, transport_header */\n    }\n\nIt does not, however, reject ihl \u003c 5.  For such a packet the\n\"if (iphlen \u003e= sizeof(*iph))\" branch is skipped, leaving the\ncrafted iphdr untouched, but the packet is still handed to\n__ip_local_out() and onward.  Downstream consumers that read\niph-\u003eihl assume a sane value: net/ipv4/ah4.c:ah_output() in\nparticular subtracts sizeof(struct iphdr) from top_iph-\u003eihl * 4\nand passes the (signed-int-negative, then cast to size_t)\nresult to memcpy(), producing an OOB access of length close to\nSIZE_MAX and a host kernel panic.\n\nAn IPv4 header with ihl \u003c 5 is malformed by definition (RFC 791:\n\"Internet Header Length is the length of the internet header in\n32 bit words ... Note that the minimum value for a correct header\nis 5.\").  The kernel should not be willing to inject such a\npacket into its own output path.\n\nReject \"iphlen \u003c sizeof(*iph)\" alongside the existing\n\"iphlen \u003e length\" check.  This matches the principle that locally\nconstructed packets that re-enter the IP stack must pass the same\nbasic sanity tests that a foreign packet would be subjected to.\n\nOnce this lands, the \"if (iphlen \u003e= sizeof(*iph))\" wrapper around\nthe fixup branch becomes redundant; left in place to keep the\npatch minimal and backport-friendly.  A follow-up can unwrap it.\n\nNote that commit 86f4c90a1c5c (\"ipv4, ipv6: ensure raw socket\nmessage is big enough to hold an IP header\") ensures the message\nbuffer is large enough to hold an iphdr, but does not constrain\nthe self-reported iph-\u003eihl.\n\nReachability: the malformed packet source is any caller with\nCAP_NET_RAW, including an unprivileged process in a user+net\nnamespace on a kernel with CONFIG_USER_NS=y.  The reproduced AH\ncrash also requires a matching xfrm AH policy on the outgoing\nroute; a container granted CAP_NET_ADMIN can install that state\nand policy in its netns.  Loopback bypasses xfrm_output, so the\ntrigger uses a real netdev.\n\nReproduced on UML + KASAN: kernel-mode fault at addr 0x0 with\nmemcpy_orig at the crash site.  Same shape reproduces inside a\nrootless Docker container with --cap-add NET_ADMIN on a stock\ndistro kernel."
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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/915fab69823a14c170dbaa3b41978768e0fe62fc"
        }
      ],
      "title": "ipv4: raw: reject IP_HDRINCL packets with ihl \u003c 5",
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    "datePublished": "2026-07-19T15:40:14.854Z",
    "dateReserved": "2026-07-19T07:54:57.035Z",
    "dateUpdated": "2026-07-20T13:43:28.323Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64114\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:52.820\",\"lastModified\":\"2026-07-20T15:17:10.157\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv4: raw: reject IP_HDRINCL packets with ihl \u003c 5\\n\\nraw_send_hdrinc() validates that the caller-supplied IPv4 header\\nfits within the message length:\\n\\n    iphlen = iph-\u003eihl * 4;\\n    err = -EINVAL;\\n    if (iphlen \u003e length)\\n        goto error_free;\\n\\n    if (iphlen \u003e= sizeof(*iph)) {\\n        /* fix up saddr, tot_len, id, csum, transport_header */\\n    }\\n\\nIt does not, however, reject ihl \u003c 5.  For such a packet the\\n\\\"if (iphlen \u003e= sizeof(*iph))\\\" branch is skipped, leaving the\\ncrafted iphdr untouched, but the packet is still handed to\\n__ip_local_out() and onward.  Downstream consumers that read\\niph-\u003eihl assume a sane value: net/ipv4/ah4.c:ah_output() in\\nparticular subtracts sizeof(struct iphdr) from top_iph-\u003eihl * 4\\nand passes the (signed-int-negative, then cast to size_t)\\nresult to memcpy(), producing an OOB access of length close to\\nSIZE_MAX and a host kernel panic.\\n\\nAn IPv4 header with ihl \u003c 5 is malformed by definition (RFC 791:\\n\\\"Internet Header Length is the length of the internet header in\\n32 bit words ... Note that the minimum value for a correct header\\nis 5.\\\").  The kernel should not be willing to inject such a\\npacket into its own output path.\\n\\nReject \\\"iphlen \u003c sizeof(*iph)\\\" alongside the existing\\n\\\"iphlen \u003e length\\\" check.  This matches the principle that locally\\nconstructed packets that re-enter the IP stack must pass the same\\nbasic sanity tests that a foreign packet would be subjected to.\\n\\nOnce this lands, the \\\"if (iphlen \u003e= sizeof(*iph))\\\" wrapper around\\nthe fixup branch becomes redundant; left in place to keep the\\npatch minimal and backport-friendly.  A follow-up can unwrap it.\\n\\nNote that commit 86f4c90a1c5c (\\\"ipv4, ipv6: ensure raw socket\\nmessage is big enough to hold an IP header\\\") ensures the message\\nbuffer is large enough to hold an iphdr, but does not constrain\\nthe self-reported iph-\u003eihl.\\n\\nReachability: the malformed packet source is any caller with\\nCAP_NET_RAW, including an unprivileged process in a user+net\\nnamespace on a kernel with CONFIG_USER_NS=y.  The reproduced AH\\ncrash also requires a matching xfrm AH policy on the outgoing\\nroute; a container granted CAP_NET_ADMIN can install that state\\nand policy in its netns.  Loopback bypasses xfrm_output, so the\\ntrigger uses a real netdev.\\n\\nReproduced on UML + KASAN: kernel-mode fault at addr 0x0 with\\nmemcpy_orig at the crash site.  Same shape reproduces inside a\\nrootless Docker container with --cap-add NET_ADMIN on a stock\\ndistro kernel.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/raw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1065b9efa4126df559b03a849c139ecfae92cd25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"bc20dbd48c26e743f7e0845020c11ed2ce8b15ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5a564f737ec54d63e8ee221d3ff396d07586d464\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3c5411fa4944ed99af3d9d1de750ea8169b6dac9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"145e9afa5b905229b4788bb72c3255f5a5f77508\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7725cd3b471740fd23d25ed1da722c671fb2a5d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"bbe0be67de296176e7243c76e3d9f02f6ae9ff0b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"915fab69823a14c170dbaa3b41978768e0fe62fc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/raw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1065b9efa4126df559b03a849c139ecfae92cd25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/145e9afa5b905229b4788bb72c3255f5a5f77508\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c5411fa4944ed99af3d9d1de750ea8169b6dac9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a564f737ec54d63e8ee221d3ff396d07586d464\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7725cd3b471740fd23d25ed1da722c671fb2a5d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/915fab69823a14c170dbaa3b41978768e0fe62fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbe0be67de296176e7243c76e3d9f02f6ae9ff0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc20dbd48c26e743f7e0845020c11ed2ce8b15ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T06:02:20+00:00",
      "cve": "CVE-2026-64114",
      "id": "CVE-2026-64114",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv4: raw: reject IP_HDRINCL packets with ihl \u003c 5",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64114.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.