CVE-2026-74287 (GCVE-0-2026-74287)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:45
VLAI
Title
sctp: validate embedded address parameter length
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: validate embedded address parameter length sctp_verify_asconf() and sctp_verify_param() only validate ADD_IP, DEL_IP, and SET_PRIMARY parameters against a fixed minimum size of sizeof(struct sctp_addip_param) + sizeof(struct sctp_paramhdr). This ensures the outer parameter is large enough to contain an embedded address parameter header, but does not verify that the embedded address parameter's declared length fits within the bounds of the outer parameter. Later, sctp_process_param() and sctp_process_asconf_param() extract the embedded address parameter and pass it to af->from_addr_param(), which uses the address parameter length to parse the variable-length address payload. A malformed peer can therefore advertise an embedded address parameter length that exceeds the remaining bytes in the enclosing parameter. Validate that addr_param->p.length does not exceed the space available after the sctp_addip_param header before processing the embedded address parameter. Reject malformed parameters when the embedded address length extends beyond the enclosing parameter bounds. This prevents out-of-bounds reads when parsing malformed parameters carried in INIT or ASCONF processing paths.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 06c8bf48505f2fef265931db82d5003d302a347b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28ba1d3c956604a89168adfb4c97cfc6c509bba5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3a44b2602d57e11e2eb85958d4cd500d14a27d9e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 85f54cf589163a75fa06e37d8c2a4a72824c6dd1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 92e4adfee56f32a963ebb105c6cd9a1ed707262a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ed8605c6f39b9b84f9a4631db6deb25e7f1e973c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0c674b20c9cdb54f8a46c88b4d00cadf82b8f0c0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e9361d0ca55c4af12aac09e2572852fa91046229 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate embedded address parameter length\n\nsctp_verify_asconf() and sctp_verify_param() only validate ADD_IP, DEL_IP,\nand SET_PRIMARY parameters against a fixed minimum size of sizeof(struct\nsctp_addip_param) + sizeof(struct sctp_paramhdr). This ensures the outer\nparameter is large enough to contain an embedded address parameter header,\nbut does not verify that the embedded address parameter\u0027s declared length\nfits within the bounds of the outer parameter.\n\nLater, sctp_process_param() and sctp_process_asconf_param() extract the\nembedded address parameter and pass it to af-\u003efrom_addr_param(), which uses\nthe address parameter length to parse the variable-length address payload.\nA malformed peer can therefore advertise an embedded address parameter\nlength that exceeds the remaining bytes in the enclosing parameter.\n\nValidate that addr_param-\u003ep.length does not exceed the space available\nafter the sctp_addip_param header before processing the embedded address\nparameter. Reject malformed parameters when the embedded address length\nextends beyond the enclosing parameter bounds.\n\nThis prevents out-of-bounds reads when parsing malformed parameters carried\nin INIT or ASCONF processing paths."
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
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              "value": "AV:N - The bug is reached when the kernel parses SCTP INIT/INIT-ACK or ASCONF chunks from a remote peer via sctp_rcv() -\u003e sctp_do_sm() -\u003e sctp_process_init()/sctp_process_asconf(), so any routable attacker can deliver the malformed ADD-IP/SET_PRIMARY TLVs over the network.\nAC:L - Exploitation is deterministic packet crafting (minimal outer TLV length with an oversized embedded address length); no race, memory-layout lottery, or victim-specific state is required beyond a target that has SCTP ADD-IP/asconf enabled, which is a normal configuration for SCTP HA/telecom servers.\nPR:N - No local privileges or pre-existing credentials are needed; an unauthenticated remote peer can send a crafted INIT to a listening SCTP endpoint or complete a handshake and send ASCONF/INIT-ACK traffic, and the vulnerable parsing runs before any application-level authentication.\nUI:N - Exploitation requires only sending SCTP packets to a reachable endpoint; no victim must open files, click links, or perform any interactive action beyond ordinary network exposure of an SCTP service.\nS:U - Impact is confined to the kernel SCTP stack on the receiving host (out-of-bounds kernel reads and possible crash); it does not cross a VM, container, or IOMMU security boundary.\nC:H - from_addr_param() performs out-of-bounds reads of up to 16 bytes (IPv6 address field) beyond the enclosing parameter boundary when the embedded length is inflated, exposing adjacent skb/kernel memory per kernel CVSS guidance that out-of-bounds reads warrant High confidentiality impact.\nI:N - The defect is an out-of-bounds read only; no kernel memory is written and the fix does not address any write primitive, so integrity impact is None.\nA:H - Reading beyond the validated parameter bounds can access unmapped memory past the skb chunk and trigger a kernel fault/oops on affected builds; even when bounded within the skb, this class of SCTP parser OOB reads is treated as High availability impact because it is remotely triggerable and may panic the host."
            }
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        "dateUpdated": "2026-08-17T05:45:26.736Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-74287",
    "datePublished": "2026-08-15T05:57:55.151Z",
    "dateReserved": "2026-08-15T05:44:03.881Z",
    "dateUpdated": "2026-08-17T05:45:26.736Z",
    "state": "PUBLISHED"
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This ensures the outer\\nparameter is large enough to contain an embedded address parameter header,\\nbut does not verify that the embedded address parameter\u0027s declared length\\nfits within the bounds of the outer parameter.\\n\\nLater, sctp_process_param() and sctp_process_asconf_param() extract the\\nembedded address parameter and pass it to af-\u003efrom_addr_param(), which uses\\nthe address parameter length to parse the variable-length address payload.\\nA malformed peer can therefore advertise an embedded address parameter\\nlength that exceeds the remaining bytes in the enclosing parameter.\\n\\nValidate that addr_param-\u003ep.length does not exceed the space available\\nafter the sctp_addip_param header before processing the embedded address\\nparameter. Reject malformed parameters when the embedded address length\\nextends beyond the enclosing parameter bounds.\\n\\nThis prevents out-of-bounds reads when parsing malformed parameters carried\\nin INIT or ASCONF processing paths.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/sm_make_chunk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"06c8bf48505f2fef265931db82d5003d302a347b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"28ba1d3c956604a89168adfb4c97cfc6c509bba5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3a44b2602d57e11e2eb85958d4cd500d14a27d9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"85f54cf589163a75fa06e37d8c2a4a72824c6dd1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"92e4adfee56f32a963ebb105c6cd9a1ed707262a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"ed8605c6f39b9b84f9a4631db6deb25e7f1e973c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"0c674b20c9cdb54f8a46c88b4d00cadf82b8f0c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e9361d0ca55c4af12aac09e2572852fa91046229\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/sm_make_chunk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06c8bf48505f2fef265931db82d5003d302a347b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0c674b20c9cdb54f8a46c88b4d00cadf82b8f0c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/28ba1d3c956604a89168adfb4c97cfc6c509bba5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a44b2602d57e11e2eb85958d4cd500d14a27d9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85f54cf589163a75fa06e37d8c2a4a72824c6dd1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92e4adfee56f32a963ebb105c6cd9a1ed707262a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9361d0ca55c4af12aac09e2572852fa91046229\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed8605c6f39b9b84f9a4631db6deb25e7f1e973c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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