CVE-2026-98573 (GCVE-0-2026-98573)
Vulnerability from cvelistv5
Published
2026-10-18 15:18
Modified
2026-10-19 09:21
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
Version: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.13"
            },
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              "version": "0",
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            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
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              "version": "5.15.222",
              "versionType": "semver"
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              "version": "6.6.158",
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              "version": "7.2.9",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()\n\nskb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max\nargument and passes the result to __pskb_pull_tail() as a signed int.  The\nfunction does not ensure that max is at least skb_headlen(skb).\n\nThis can happen while parsing IPv6 extension headers when an skb already\nhas a linear area larger than MAX_IPV6_HDR_LEN.  Once the parser needs data\nbeyond the linear area, max - skb_headlen(skb) wraps and is converted to a\nnegative delta.  __pskb_pull_tail() then passes that negative length to\nskb_copy_bits(), where it can become a very large copy length.\n\nPass the requested length itself as the pull bound at the three\nextension-header call sites, so the delta can no longer go negative."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:21:58.681Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26"
        },
        {
          "url": "https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"
        }
      ],
      "title": "net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98573",
    "datePublished": "2026-10-18T15:18:38.914Z",
    "dateReserved": "2026-09-25T10:25:14.358Z",
    "dateUpdated": "2026-10-19T09:21:58.681Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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