CVE-2026-89476sctp: fix stream->outcnt underflow on duplicate RECONF responses
- 7.5HighCVSS base score
- 0.70%Exploitation in 30 daysEPSS · top 46% 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 stream->outcnt underflow on duplicate RECONF responses A cached RECONF chunk may contain more than one request parameter. A duplicate response can therefore find and process the same ADD_OUT request again while another parameter is still outstanding, rolling back outcnt twice and possibly underflowing it. Track outstanding request types as bits and clear each bit after its first response. Later responses for the same request are then ignored.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 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 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.70% · top 46% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 041f7df5a929d3e7435dd8387e8ea17f2d412b7d
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 59f61c39cb99ee1737bd742a20094fe5653389bb
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 793519e343867ee9a3e84f6cac07f81f2aec7b5d
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 092acd3c55a4077b00489064615d8d2d898daf91
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 2d867663c563e8009257b9edf9c8ec75d9bbf19a
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < d02a5794c3deedcb8476d017fcee2b7aaedab2e1
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68
- affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 – < 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e
- affected 4.12
- unaffected < 4.12
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/041f7df5a929d3e7435dd8387e8ea17f2d412b7d (opens in a new tab)
- https://git.kernel.org/stable/c/59f61c39cb99ee1737bd742a20094fe5653389bb (opens in a new tab)
- https://git.kernel.org/stable/c/793519e343867ee9a3e84f6cac07f81f2aec7b5d (opens in a new tab)
- https://git.kernel.org/stable/c/092acd3c55a4077b00489064615d8d2d898daf91 (opens in a new tab)
- https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a (opens in a new tab)
- https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1 (opens in a new tab)
- https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 (opens in a new tab)
- https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e (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-2026-76382 (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-2026-89476)Record last updated .