CVE-2026-68300sctp: auth: verify auth requirement when auth_chunk is NULL
- 9.8CriticalCVSS base score
- 0.58%Exploitation in 30 daysEPSS · top 52% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.58% · top 52% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < a129792b3aef15002746c13522781d92ed3522c3
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 6caf0e8590c0bf05a76b0d387726adf3a6f3725c
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < ec2e157fc9678a9bc411305a25aec3fd337d7efb
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 18957373920caf5cdaf5cf32e5d1d7a99ca7700a
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 83f5031f2a6a49d696eb4cc0898345d12f9c6451
- affected bbd0d59809f923ea2b540cbd781b32110e249f6e – < 8e04823c120b376ef7dab14b60ebf6823aa16c14
- affected 2.6.24
- unaffected < 2.6.24
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/a129792b3aef15002746c13522781d92ed3522c3 (opens in a new tab)
- https://git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65bd26b247 (opens in a new tab)
- https://git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3a6f3725c (opens in a new tab)
- https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb (opens in a new tab)
- https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646 (opens in a new tab)
- https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a (opens in a new tab)
- https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451 (opens in a new tab)
- https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55401 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68300)Record last updated .