CVE-2026-68320sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
- 7.3HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% 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: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes. Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.
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 | High7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.3.
Affected products
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 3d22a7da2e264f407c729f33a0a346ff76108bc6
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 6837c1c19a259518974cbc5a52017646e3906564
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 54bb4c03fa17cdcb157c26c33e60a78cf32960f5
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 5a365f1e423444c5da7eb689a8661633dad43e48
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 886e28e14ab655012779016d251fef53d103aa12
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 11092d79eb2b7c0068382f72fc2416d1786bb2e0
- affected 1f485649f52929d9937b346a920a522a7363e202 – < b6ea3dda09eb4d5caf7bbc00f857688cf9e98255
- affected 1f485649f52929d9937b346a920a522a7363e202 – < ff04b26794a16a8a879eb4fd2c02c2d6b03850e9
- 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/3d22a7da2e264f407c729f33a0a346ff76108bc6 (opens in a new tab)
- https://git.kernel.org/stable/c/6837c1c19a259518974cbc5a52017646e3906564 (opens in a new tab)
- https://git.kernel.org/stable/c/54bb4c03fa17cdcb157c26c33e60a78cf32960f5 (opens in a new tab)
- https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48 (opens in a new tab)
- https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12 (opens in a new tab)
- https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0 (opens in a new tab)
- https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255 (opens in a new tab)
- https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9 (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-2026-55421 (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-2026-68320)Record last updated .