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CriticalFix available

sctp: auth: verify auth requirement when auth_chunk is NULL

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.265, 5.15.216, 6.1.183, 6.12.101, 6.18.42, 6.6.148, 7.1.6
CVEs
CVE-2026-68300
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 21:31 UTC · Revision 1

Source evidence

sctp: auth: verify auth requirement when auth_chunk is NULL

core-osv · Original source

Published 10 Aug 2026, 12:02 UTC

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.

osv:CVE-2026-68300

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6

Complete source record
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  "url": "https://osv.dev/vulnerability/CVE-2026-68300",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-68300",
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      "modified": "2026-10-28T02:30:23.795874807Z",
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  "source_id": "core-osv",
  "document_id": 490295,
  "published_at": "2026-08-10T12:02:34.168+00:00"
}