Vulnerability details
CVE-2026-89476
Linux Linux
sctp: fix stream->outcnt underflow on duplicate RECONF responses
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.12 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 59f61c39cb99ee1737bd742a20094fe5653389bb | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 793519e343867ee9a3e84f6cac07f81f2aec7b5d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 092acd3c55a4077b00489064615d8d2d898daf91 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 041f7df5a929d3e7435dd8387e8ea17f2d412b7d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < d02a5794c3deedcb8476d017fcee2b7aaedab2e1 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 2d867663c563e8009257b9edf9c8ec75d9bbf19a | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/041f7df5a929d3e7435dd8387e8ea17f2d412b7d
- https://git.kernel.org/stable/c/59f61c39cb99ee1737bd742a20094fe5653389bb
- https://git.kernel.org/stable/c/793519e343867ee9a3e84f6cac07f81f2aec7b5d
- https://git.kernel.org/stable/c/092acd3c55a4077b00489064615d8d2d898daf91
- https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a
- https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1
- https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68
- https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e
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Details
- Published
- 2026-09-11
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.69%
Probability of exploitation in 30 days
53.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- —