CVE-2026-89476

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 041f7df5a929d3e7435dd8387e8ea17f2d412b7daffected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 59f61c39cb99ee1737bd742a20094fe5653389bbaffected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 793519e343867ee9a3e84f6cac07f81f2aec7b5daffected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 092acd3c55a4077b00489064615d8d2d898daf91affected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 2d867663c563e8009257b9edf9c8ec75d9bbf19aaffected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < d02a5794c3deedcb8476d017fcee2b7aaedab2e1affected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68affected
LinuxLinux11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 < 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6eaffected
LinuxLinux4.12affected
LinuxLinux0 < 4.12unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References