CVE-2026-89476
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Linux
PublishedSep 11, 2026
First seenSep 11, 2026
How to fix
Update
- Linux Linux041f7df5a929d3e7435dd8387e8ea17f2d412b7d, 59f61c39cb99ee1737bd742a20094fe5653389bb, 793519e343867ee9a3e84f6cac07f81f2aec7b5d, 092acd3c55a4077b00489064615d8d2d898daf91, 2d867663c563e8009257b9edf9c8ec75d9bbf19a, d02a5794c3deedcb8476d017fcee2b7aaedab2e1, 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68, 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 041f7df5a929d3e7435dd8387e8ea17f2d412b7d, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 59f61c39cb99ee1737bd742a20094fe5653389bb, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 793519e343867ee9a3e84f6cac07f81f2aec7b5d, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 092acd3c55a4077b00489064615d8d2d898daf91, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 2d867663c563e8009257b9edf9c8ec75d9bbf19a, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < d02a5794c3deedcb8476d017fcee2b7aaedab2e1, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68, 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ≤ v < 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e, 4.12 | 041f7df5a929d3e7435dd8387e8ea17f2d412b7d, 59f61c39cb99ee1737bd742a20094fe5653389bb, 793519e343867ee9a3e84f6cac07f81f2aec7b5d, 092acd3c55a4077b00489064615d8d2d898daf91, 2d867663c563e8009257b9edf9c8ec75d9bbf19a, d02a5794c3deedcb8476d017fcee2b7aaedab2e1, 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68, 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e |
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