- 9.8CriticalCVSS base score
- 0.52%Exploitation in 30 daysEPSS · top 55% 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: validate cookie AUTH state before use When cookie authentication is disabled, COOKIE_ECHO restores fixed-size AUTH fields directly from peer-controlled cookie bytes. A forged RANDOM length, HMAC list, or CHUNKS list can then reach association consumers with lengths or identifiers that were never validated against the local backing arrays. A forged RANDOM length can cause out-of-bounds reads during key-vector construction. A forged HMAC identifier also caused a 32-byte write past a zero-length AUTH chunk, providing a primitive for a local privilege escalation chain. Validate the cookie's RANDOM, HMACS, and CHUNKS parameters at the cookie trust boundary before copying them into the association. Reject invalid types, malformed lengths, unsupported HMAC identifiers, HMAC lists without SHA1, and forbidden chunk ids.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 56 days later
· 56 days 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)
- 0.52% · top 55% of all CVEs (11 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 1f485649f52929d9937b346a920a522a7363e202 – < 4a4410de8dc6903d859c9e1731fc6dcee28bd072
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 7f17984cfa697613800eb693e183b06884129bd3
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 88619b117be1daf633ce32210570ce35a0bd1c98
- affected 1f485649f52929d9937b346a920a522a7363e202 – < 3dbb44d88b1e94dd31fe43588af7437b34b44d56
- affected 2.6.24
- unaffected < 2.6.24
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/4a4410de8dc6903d859c9e1731fc6dcee28bd072 (opens in a new tab)
- https://git.kernel.org/stable/c/7f17984cfa697613800eb693e183b06884129bd3 (opens in a new tab)
- https://git.kernel.org/stable/c/88619b117be1daf633ce32210570ce35a0bd1c98 (opens in a new tab)
- https://git.kernel.org/stable/c/3dbb44d88b1e94dd31fe43588af7437b34b44d56 (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-2026-66582 (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-2026-74752)Record last updated .