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CVE-2026-89476

HIGHCVSS 7.5/10EPSS 0.60%

Last modified

CVE-2026-89476 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.60%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 041f7df5a929d3e7435dd8387e8ea17f2d412b7d; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 59f61c39cb99ee1737bd742a20094fe5653389bb; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 793519e343867ee9a3e84f6cac07f81f2aec7b5d; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 092acd3c55a4077b00489064615d8d2d898daf91; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 2d867663c563e8009257b9edf9c8ec75d9bbf19a; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < d02a5794c3deedcb8476d017fcee2b7aaedab2e1; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68; >= 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3, < 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e
LinuxLinux4.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89476?
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.
How severe is CVE-2026-89476?
CVE-2026-89476 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89476?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST