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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-45257 Detail

Description

The KTLS receive path decrypted each record in place, assuming that the mbufs holding received data were anonymous and safe to modify. This assumption does not hold for data placed on a socket by sendfile(2), which can reference file-backed memory directly through non-anonymous M_EXTPG pages or EXT_SFBUF mbufs. When the sender transmits such data over a loopback connection without enabling KTLS on the transmit side, the file-backed mbufs reach the receiver's decryption path unchanged. Decrypting a record in place then overwrites the backing file's page cache instead of a private copy of the data. An unprivileged local user who can read a file can overwrite its contents with data of their choosing by sending the file over a loopback connection on which they have enabled KTLS receive. The write modifies the page cache directly, so it bypasses file flags such as schg and is written back to disk. By overwriting a setuid binary or other trusted file, a local user can escalate privileges, potentially gaining full control of the affected system.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
http://www.openwall.com/lists/oss-security/2026/06/10/20 CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2026/06/10/21 CVE Mailing List  Third Party Advisory 
https://security.freebsd.org/advisories/FreeBSD-SA-26:26.ktls.asc FreeBSD Vendor Advisory 
https://www.heise.de/en/news/FreeBSD-Privilege-Escalation-Vulnerability-with-Tongue-in-Cheek-Codename-11329109.html CISA-ADP Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-123 Write-what-where Condition FreeBSD  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-45257
NVD Published Date:
06/26/2026
NVD Last Modified:
06/27/2026
Source:
FreeBSD