CVE-2026-98573 (GCVE-0-2026-98573)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:18 – Updated: 2026-10-19 09:21
VLAI
Title
net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < 9c4e432132a97b82edf28fa172c39f743e6bfb26 (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < 718747afa5463d9cc5fd9a09f03b2a492edd9b78 (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < a0ad0473c09d2e947aecac5c82e637ec85924b12 (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962 (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < d7f474226809471dc7877435e9c492cc914df0bf (git)
Affected: 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 , < 3b4e0b0c008a8c1b474730248cd5b873026c74bd (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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": [
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          "url": "https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26"
        },
        {
          "url": "https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78"
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        {
          "url": "https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12"
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        {
          "url": "https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"
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      ],
      "title": "net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()",
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    "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"
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      "date": "2026-11-02",
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      "source": "Microsoft CSAF VEX",
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      "title": "net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()",
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          }
        ],
        "id": "CVE-2026-98573",
        "lastModified": "2026-10-19T10:19:15.453",
        "metrics": {},
        "published": "2026-10-18T16:17:09.587",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-30T03:52:43+00:00",
      "cve": "CVE-2026-98573",
      "id": "CVE-2026-98573",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "265",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98573.json",
      "version": "3"
    }
  }
}



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