What’s Vulnerable › Vulnerabilities

CVE-2026-68320: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-19
• Weakness: CWE-787

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.

Affected products

• Linux kernel: 2.6.24 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0
• https://git.kernel.org/stable/c/3d22a7da2e264f407c729f33a0a346ff76108bc6
• https://git.kernel.org/stable/c/54bb4c03fa17cdcb157c26c33e60a78cf32960f5
• https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48
• https://git.kernel.org/stable/c/6837c1c19a259518974cbc5a52017646e3906564
• https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12
• https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255
• https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9

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