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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
bbd0d59809f923ea2b540cbd781b32110e249f6e affected < ec2e157fc9678a9bc411305a25aec3fd337d7efb
bbd0d59809f923ea2b540cbd781b32110e249f6e affected < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646
bbd0d59809f923ea2b540cbd781b32110e249f6e affected < 18957373920caf5cdaf5cf32e5d1d7a99ca7700a
bbd0d59809f923ea2b540cbd781b32110e249f6e affected < 83f5031f2a6a49d696eb4cc0898345d12f9c6451
bbd0d59809f923ea2b540cbd781b32110e249f6e affected < 8e04823c120b376ef7dab14b60ebf6823aa16c14
Linux Linux affected
Version Status Constraints
2.6.24 affected —
0 unaffected < 2.6.24
6.6.148 unaffected ≤ 6.6.*
6.12.101 unaffected ≤ 6.12.*
6.18.42 unaffected ≤ 6.18.*
7.1.6 unaffected ≤ 7.1.*
7.2-rc5 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a cve-icon
https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646 cve-icon
https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451 cve-icon
https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14 cve-icon
https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb cve-icon
History

Mon, 10 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-306

Mon, 10 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description 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.
Title sctp: auth: verify auth requirement when auth_chunk is NULL
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-10T12:02:34.168Z

Reserved: 2026-07-30T09:28:09.380Z

Link: CVE-2026-68300

cve-icon Vulnrichment

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cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-10T15:30:05Z

Weaknesses