CVE-2026-68300 (GCVE-0-2026-68300)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-10-19 21:09
VLAI
Title
sctp: auth: verify auth requirement when auth_chunk is NULL
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:46 UTC
CWE
  • CWE-287 - Improper Authentication
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < a129792b3aef15002746c13522781d92ed3522c3 (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247 (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 6caf0e8590c0bf05a76b0d387726adf3a6f3725c (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < ec2e157fc9678a9bc411305a25aec3fd337d7efb (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646 (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 18957373920caf5cdaf5cf32e5d1d7a99ca7700a (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 83f5031f2a6a49d696eb4cc0898345d12f9c6451 (git)
Affected: bbd0d59809f923ea2b540cbd781b32110e249f6e , < 8e04823c120b376ef7dab14b60ebf6823aa16c14 (git)
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Linux Linux Affected: 2.6.24
Unaffected: 0 , < 2.6.24 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "url": "https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received",
        "weaknesses": [
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            "description": [
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                "lang": "en",
                "value": "CWE-287"
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            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
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      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-10-19T23:40:43+00:00",
      "cve": "CVE-2026-68300",
      "id": "CVE-2026-68300",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:fixed": "773",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: auth: verify auth requirement when auth_chunk is NULL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68300.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-21T23:46:20Z",
      "cve": "CVE-2026-68300",
      "id": "CVE-2026-68300",
      "initial_release_date": "2026-08-14T17:14:24Z",
      "product_status:known_affected": "680",
      "product_status:recommended": "378",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68300",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-68300.json",
      "version": "16"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-68300",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:46:55.343274Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
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                    "cweId": "CWE-287",
                    "description": "CWE-287 Improper Authentication",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:46:55.902Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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                {
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              "versions": [
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                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "version": "5.10.265",
                  "versionType": "semver"
                },
                {
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                  "version": "5.15.216",
                  "versionType": "semver"
                },
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                  "version": "6.1.183",
                  "versionType": "semver"
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                  "version": "6.6.148",
                  "versionType": "semver"
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                },
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                  "status": "unaffected",
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                  "versionType": "original_commit_for_fix"
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                  "value": "AV:N - The vulnerable code is SCTP COOKIE-ECHO chunk processing in the kernel\u0027s SCTP state machine, reached directly from packets received on the network from any remote peer over an arbitrarily routed SCTP connection.\nAC:L - The attacker deterministically triggers the bypass by completing a normal INIT/INIT-ACK exchange with the AUTH extension advertised and then sending COOKIE-ECHO with no preceding AUTH chunk; no race, no memory-layout dependency, and every step is under the attacker\u0027s control.\nPR:N - This is the pre-authentication association-establishment path itself; the attacker needs no credentials, no shared SCTP-AUTH key, and no account, since the bug is precisely that the required authentication is skipped.\nUI:N - The listening SCTP endpoint processes the crafted COOKIE-ECHO automatically in the receive path; no action by any local user or administrator is needed.\nS:U - The bypass affects the SCTP association and the application relying on it within the same host security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - An unauthenticated peer is admitted as an apparently authenticated one, and because peer.auth_capable is set the SCTP_AUTH_NO_AUTH notification is suppressed so the application cannot detect it, giving the attacker full read access to all data the service sends on that association.\nI:H - The attacker can inject arbitrary SCTP data and control chunks into the service as a trusted, supposedly key-verified peer, and can use the dupcook restart path to update or replace an existing association\u0027s state without authentication.\nA:H - Authenticating COOKIE-ECHO is the RFC 4895 defense against unauthorized association restart; bypassing it lets an attacker reset/take over an established association, dropping its queued state and denying service to the legitimate peer, and lets unauthorized peers consume association and accept-queue resources on an endpoint meant to admit only key-holding peers."
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "cveId": "CVE-2026-68300",
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        "dateReserved": "2026-07-30T09:28:09.380Z",
        "dateUpdated": "2026-10-19T21:09:04.214Z",
        "state": "PUBLISHED"
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    }
  }
}



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