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net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max argument and passes the result to __pskb_pull_tail() as a signed int. The function does not ensure that max is at least skb_headlen(skb). This can happen while parsing IPv6 extension headers when an skb already has a linear area larger than MAX_IPV6_HDR_LEN. Once the parser needs data beyond the linear area, max - skb_headlen(skb) wraps and is converted to a negative delta. __pskb_pull_tail() then passes that negative length to skb_copy_bits(), where it can become a very large copy length. Pass the requested length itself as the pull bound at the three extension-header call sites, so the delta can no longer go negative.

Announced Source revision 1
Original source ↗

CVE-2026-98573

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-2026-98573

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": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "9c4e432132a97b82edf28fa172c39f743e6bfb26",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "718747afa5463d9cc5fd9a09f03b2a492edd9b78",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "a0ad0473c09d2e947aecac5c82e637ec85924b12",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "b2da5ed3d8c75e1b729a21b6d3beaed415e263f6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "d7f474226809471dc7877435e9c492cc914df0bf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
        "lessThan": "3b4e0b0c008a8c1b474730248cd5b873026c74bd",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/core/skbuff.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/skbuff.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98573

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38593 · Revision 1
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Publisher date
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