CVE-2026-68320
sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
Description
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.
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 17, 2026, 5:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include the fix.
- Verify chunk entry limit matches destination capacity.
- Apply patches for SCTP module updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68320.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68320 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68320
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68320 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68320 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '5a365f1e423444c5da7eb689a8661633dad43e48', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '886e28e14ab655012779016d251fef53d103aa12', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '11092d79eb2b7c0068382f72fc2416d1786bb2e0', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'b6ea3dda09eb4d5caf7bbc00f857688cf9e98255', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'ff04b26794a16a8a879eb4fd2c02c2d6b03850e9', 'versionType': 'git'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.24'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.24', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '5a365f1e423444c5da7eb689a8661633dad43e48', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '886e28e14ab655012779016d251fef53d103aa12', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '11092d79eb2b7c0068382f72fc2416d1786bb2e0', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'b6ea3dda09eb4d5caf7bbc00f857688cf9e98255', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'ff04b26794a16a8a879eb4fd2c02c2d6b03850e9', 'versionType': 'git'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.24'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.24', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '5a365f1e423444c5da7eb689a8661633dad43e48', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '886e28e14ab655012779016d251fef53d103aa12', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': '11092d79eb2b7c0068382f72fc2416d1786bb2e0', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'b6ea3dda09eb4d5caf7bbc00f857688cf9e98255', 'versionType': 'git'}, {'status': 'affected', 'version': '1f485649f52929d9937b346a920a522a7363e202', 'lessThan': 'ff04b26794a16a8a879eb4fd2c02c2d6b03850e9', 'versionType': 'git'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.24'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.24', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/auth.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0 Added Reference https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48 Added Reference https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12 Added Reference https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255 Added Reference https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9