CVE-2026-64046
net: tls: prevent chain-after-chain in plain text SG
Description
In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 20, 2026, 3:17 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64046
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.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest version.
- Apply relevant security patches for the net:tls component.
- Verify TLS configuration for correct chaining.
- Restart affected network services if necessary.
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-2026-64046.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64046 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-2026-64046
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-2026-64046 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64046 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
Jul. 20, 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
Jul. 19, 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': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': '49a5faaa471ddcd37b6893970c9916eb836e7c31', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': '91359966e247c0244c66d50bbb8e74aefa4321c3', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': '410351158dfef2d67fea6603680b3a6013c6ed9d', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': 'acdc12b71c9aa4be5dcd2c8062753c6d2033e235', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': '929b1548e63ac72e104c07d8ee8cbbeeba2fa89a', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': 'af855f4c966afafef74faf8390c7b86568c0d46d', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': 'b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36', 'versionType': 'git'}, {'status': 'affected', 'version': '9aaaa56845a06aeabdd597cbe19492dc01f281ec', 'lessThan': 'ff26a0e8377dec07e4a7230db7675bed1b9a6d03', 'versionType': 'git'}, {'status': 'affected', 'version': 'd529d6c9f7e3aaeac13c4948f79799ccb825f29d', 'versionType': 'git'}, {'status': 'affected', 'version': '5.4.14', 'lessThan': '5.5', 'versionType': 'semver'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.5'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective. Added Reference https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d Added Reference https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31 Added Reference https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3 Added Reference https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a Added Reference https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235 Added Reference https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d Added Reference https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36 Added Reference https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03