CVE-2026-89476 — sctp: fix stream->outcnt underflow on duplicate RECONF responses
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 tha…
Published: 2026-09-11 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7