CVE-2026-68300 (GCVE-0-2026-68300)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
Modified
2026-10-19 21:09
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
Version: bbd0d59809f923ea2b540cbd781b32110e249f6e
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No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never\\n   called and auth_chunk remains NULL.\\n\\nFix by checking sctp_auth_recv_cid() when auth_chunk is NULL:\\nif authentication is required, return false to drop the chunk;\\notherwise continue normally.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.24\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:32:51.209Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68300\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:04.214Z\", \"dateReserved\": \"2026-07-30T09:28:09.380Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:02:34.168Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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