CVE-2026-53225 (GCVE-0-2026-53225)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-08-05 12:34
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix uninit-value in __sctp_rcv_asconf_lookup() __sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF chunk can hold the ADDIP header and a parameter header, then calls af->from_addr_param(), which reads the full address (16 bytes for IPv6) trusting the parameter's declared length. An unauthenticated peer can send a truncated trailing ASCONF chunk that declares an IPv6 address parameter but stops after the 4-byte parameter header; reached from the no-association lookup path, from_addr_param() then reads uninitialized bytes past the parameter. Impact: an unauthenticated SCTP peer makes the receive path read up to 16 bytes of uninitialized memory past a truncated ASCONF address parameter. The sibling __sctp_rcv_init_lookup() bounds parameters with sctp_walk_params(); this path open-codes the fetch and omits the bound. Verify the whole address parameter lies within the chunk before from_addr_param() reads it, the same class of fix as commit 51e5ad549c43 ("net: sctp: fix KMSAN uninit-value in sctp_inq_pop").
References
Impacted products
Vendor Product Version
Linux Linux Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
Version: df21857714398acb8b24a8bb5a6d2286dd9c59ef
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.25"
            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
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                {
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                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix uninit-value in __sctp_rcv_asconf_lookup()\n\n__sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF\nchunk can hold the ADDIP header and a parameter header, then calls\naf-\u003efrom_addr_param(), which reads the full address (16 bytes for IPv6)\ntrusting the parameter\u0027s declared length.\n\nAn unauthenticated peer can send a truncated trailing ASCONF chunk that\ndeclares an IPv6 address parameter but stops after the 4-byte parameter\nheader; reached from the no-association lookup path, from_addr_param() then\nreads uninitialized bytes past the parameter.\n\nImpact: an unauthenticated SCTP peer makes the receive path read up to 16\nbytes of uninitialized memory past a truncated ASCONF address parameter.\n\nThe sibling __sctp_rcv_init_lookup() bounds parameters with\nsctp_walk_params(); this path open-codes the fetch and omits the bound.\nVerify the whole address parameter lies within the chunk before\nfrom_addr_param() reads it, the same class of fix as commit 51e5ad549c43\n(\"net: sctp: fix KMSAN uninit-value in sctp_inq_pop\")."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is reached from the SCTP packet receive path via IP/IPv6 or SCTP-over-UDP encapsulation. A remote peer can send the malformed AUTH-bundled ASCONF packet over the network.\nAC:L - Triggering only requires a syntactically valid SCTP packet with an AUTH chunk before a truncated ASCONF chunk declaring an IPv6 address parameter. There is no race or condition outside attacker control.\nPR:N - The association lookup path only checks that an AUTH chunk was seen before ASCONF; it does not validate the AUTH HMAC before the vulnerable read. The commit explicitly describes an unauthenticated peer reaching the bug.\nUI:N - No victim action is required after SCTP is reachable on the target. The attacker sends network packets directly to the kernel receive path.\nS:U - The vulnerability affects the kernel SCTP networking stack within the same operating-system security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The bug causes an unauthenticated out-of-bounds/uninitialized read of up to a full IPv6 address worth of bytes past a truncated ASCONF parameter. Under the provided guidance, this is scored High because it is an OOB read not strictly limited to a few harmless bytes.\nI:N - The vulnerable operation reads bytes into a temporary SCTP address used for lookup and does not write attacker data to kernel structures. No direct integrity modification or control-flow overwrite is present.\nA:H - The malformed packet can repeatedly trigger an invalid kernel receive-path read, and such out-of-bounds reads can fault or panic on hardened/sanitized deployments. With uncertainty resolved upward, availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:17.928Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16"
        },
        {
          "url": "https://git.kernel.org/stable/c/928dd94db23e8ba340f83d68f7f24d831b7a4426"
        },
        {
          "url": "https://git.kernel.org/stable/c/d796cfd06074b579d265b28401306cadd30db945"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ce96f1182644079249a24ac7e2ffc32e0301a46"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6bd0bb7697ea8c0387b0d9d973453f479017b23"
        },
        {
          "url": "https://git.kernel.org/stable/c/f76a8b323e28e0951f979dbef20a7496383c47df"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e86817b8af4d552f3c6fe04ca52bb0c8c57411d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8373d7090b745728de66308deeecc67e8d319ce"
        }
      ],
      "title": "sctp: fix uninit-value in __sctp_rcv_asconf_lookup()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53225",
    "datePublished": "2026-06-25T08:39:25.911Z",
    "dateReserved": "2026-06-09T07:44:35.392Z",
    "dateUpdated": "2026-08-05T12:34:17.928Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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