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9.8
CRITICAL CVSS 3.1
CVE-2026-68300
sctp: auth: verify auth requirement when auth_chunk is NULL
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: sctp: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Details
INFO

Published Date :

Aug. 10, 2026, 1:20 p.m.

Last Modified :

Aug. 17, 2026, 5:18 a.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-68300 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Apply kernel patch to correctly verify authentication requirements.
  • Apply the provided Linux kernel patch.
  • Ensure authentication is checked for all chunks.
  • Verify the fix in production environments.
References
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-2026-68300.

URL Resource
https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a
https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646
https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451
https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14
https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-68300 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-2026-68300 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-2026-68300 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-68300 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': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': 'ec2e157fc9678a9bc411305a25aec3fd337d7efb', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '28c5fdce9dd955d2baf5e28987819b6d7cfaf646', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '18957373920caf5cdaf5cf32e5d1d7a99ca7700a', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '83f5031f2a6a49d696eb4cc0898345d12f9c6451', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '8e04823c120b376ef7dab14b60ebf6823aa16c14', 'versionType': 'git'}], 'programFiles': ['net/sctp/sm_statefuns.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/sm_statefuns.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': 'ec2e157fc9678a9bc411305a25aec3fd337d7efb', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '28c5fdce9dd955d2baf5e28987819b6d7cfaf646', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '18957373920caf5cdaf5cf32e5d1d7a99ca7700a', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '83f5031f2a6a49d696eb4cc0898345d12f9c6451', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '8e04823c120b376ef7dab14b60ebf6823aa16c14', 'versionType': 'git'}], 'programFiles': ['net/sctp/sm_statefuns.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/sm_statefuns.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:N/AC:L/PR:N/UI:N/S:U/C:H/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': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': 'ec2e157fc9678a9bc411305a25aec3fd337d7efb', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '28c5fdce9dd955d2baf5e28987819b6d7cfaf646', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '18957373920caf5cdaf5cf32e5d1d7a99ca7700a', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '83f5031f2a6a49d696eb4cc0898345d12f9c6451', 'versionType': 'git'}, {'status': 'affected', 'version': 'bbd0d59809f923ea2b540cbd781b32110e249f6e', 'lessThan': '8e04823c120b376ef7dab14b60ebf6823aa16c14', 'versionType': 'git'}], 'programFiles': ['net/sctp/sm_statefuns.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/sm_statefuns.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: sctp: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.
    Added Reference https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a
    Added Reference https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646
    Added Reference https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451
    Added Reference https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14
    Added Reference https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact