CVE-2026-89476

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Source
https://cve.org/CVERecord?id=CVE-2026-89476
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89476.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-89476
Downstream
Published
2026-09-11T19:43:33Z
Modified
2026-09-14T03:46:07Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
sctp: fix stream->outcnt underflow on duplicate RECONF responses
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89476.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3
Fixed
2d867663c563e8009257b9edf9c8ec75d9bbf19a
Fixed
d02a5794c3deedcb8476d017fcee2b7aaedab2e1
Fixed
8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68
Fixed
3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89476.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.12.0
Fixed
6.12.109
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.50
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.2.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89476.json"