{"id":"CVE-2026-68320","title":"sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 3d22a7da2e264f407c729f33a0a346ff76108bc6","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 6837c1c19a259518974cbc5a52017646e3906564","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 54bb4c03fa17cdcb157c26c33e60a78cf32960f5","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 5a365f1e423444c5da7eb689a8661633dad43e48","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 886e28e14ab655012779016d251fef53d103aa12","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 11092d79eb2b7c0068382f72fc2416d1786bb2e0","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < b6ea3dda09eb4d5caf7bbc00f857688cf9e98255","Linux >= 1f485649f52929d9937b346a920a522a7363e202 < ff04b26794a16a8a879eb4fd2c02c2d6b03850e9","Linux 2.6.24"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:47:04.682572Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:07.878Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68320","references":[{"url":"https://git.kernel.org/stable/c/3d22a7da2e264f407c729f33a0a346ff76108bc6"},{"url":"https://git.kernel.org/stable/c/6837c1c19a259518974cbc5a52017646e3906564"},{"url":"https://git.kernel.org/stable/c/54bb4c03fa17cdcb157c26c33e60a78cf32960f5"},{"url":"https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48"},{"url":"https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12"},{"url":"https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0"},{"url":"https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"},{"url":"https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"}],"tags":["cve.org"],"epss":0.00127,"epssPercentile":0.02147,"ingestedAt":"2026-10-16T17:24:46.857Z","slug":"CVE-2026-68320","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc->c.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\n\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity.\n\n## Affected\n\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 3d22a7da2e264f407c729f33a0a346ff76108bc6`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 6837c1c19a259518974cbc5a52017646e3906564`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 54bb4c03fa17cdcb157c26c33e60a78cf32960f5`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 5a365f1e423444c5da7eb689a8661633dad43e48`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 886e28e14ab655012779016d251fef53d103aa12`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < 11092d79eb2b7c0068382f72fc2416d1786bb2e0`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < b6ea3dda09eb4d5caf7bbc00f857688cf9e98255`\n- `Linux >= 1f485649f52929d9937b346a920a522a7363e202 < ff04b26794a16a8a879eb4fd2c02c2d6b03850e9`\n- `Linux 2.6.24`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}