CVE-2026-68320

Summary

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes.

Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1f485649f52929d9937b346a920a522a7363e202 < 5a365f1e423444c5da7eb689a8661633dad43e48affected
LinuxLinux1f485649f52929d9937b346a920a522a7363e202 < 886e28e14ab655012779016d251fef53d103aa12affected
LinuxLinux1f485649f52929d9937b346a920a522a7363e202 < 11092d79eb2b7c0068382f72fc2416d1786bb2e0affected
LinuxLinux1f485649f52929d9937b346a920a522a7363e202 < b6ea3dda09eb4d5caf7bbc00f857688cf9e98255affected
LinuxLinux1f485649f52929d9937b346a920a522a7363e202 < ff04b26794a16a8a879eb4fd2c02c2d6b03850e9affected
LinuxLinux2.6.24affected
LinuxLinux0 < 2.6.24unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References