CVE-2026-68300Critical· 9.8▾ MidnightIn 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 aut…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.6%
9.8 → 7
critical → high
Last analysed / modified upstream
7 → 9.8
high → critical
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:
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.
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.
Linux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < a129792b3aef15002746c13522781d92ed3522c3Linux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247Linux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 6caf0e8590c0bf05a76b0d387726adf3a6f3725cLinux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < ec2e157fc9678a9bc411305a25aec3fd337d7efbLinux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646Linux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 18957373920caf5cdaf5cf32e5d1d7a99ca7700aLinux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 83f5031f2a6a49d696eb4cc0898345d12f9c6451Linux >= bbd0d59809f923ea2b540cbd781b32110e249f6e < 8e04823c120b376ef7dab14b60ebf6823aa16c14Linux 2.6.24Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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