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ipv4: validate checksum_start before completing checksum

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work.

Announced Source revision 1
Original source ↗

CVE-2026-99999

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-2026-99999

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": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "a464d950f31c89565cbaae038cc60db04fe01956",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "0fab003ef4698e0628060a45a48f14b43ba2a40a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "94524b7b32691de2e2ce162c04d6cbc9106e5cbf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "a65f69e0f38ffbed1b128029e09097436416dc8b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "32a8b0adaa18e52aaa0b246b5ffe683075354dbb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "f3e835af6226f1dd12160cbd696081e9b6155de0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "c3e33464746166264334641dc850a36eef7e6326",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
        "lessThan": "6785011f8b16abf40b1e9d8b2e332232b3e68822",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/ip.h",
      "net/bridge/netfilter/nf_conntrack_bridge.c",
      "net/ipv4/ip_output.c",
      "net/netfilter/nfnetlink_queue.c",
      "net/netfilter/xt_CHECKSUM.c",
      "net/xfrm/xfrm_output.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.27"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.27",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.272",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.223",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.190",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.159",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/ip.h",
      "net/bridge/netfilter/nf_conntrack_bridge.c",
      "net/ipv4/ip_output.c",
      "net/netfilter/nfnetlink_queue.c",
      "net/netfilter/xt_CHECKSUM.c",
      "net/xfrm/xfrm_output.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-99999

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#55619 · Revision 1
Added to Heist Feed
Publisher date
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