CVE-2026-45257 (GCVE-0-2026-45257)

Vulnerability from cvelistv5 – Published: 2026-06-26 14:50 – Updated: 2026-06-27 03:55
VLAI
Title
Arbitrary file overwrite via the KTLS receive path
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-123 - Write-what-where Condition
Assigner
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Affected: 15.0-RELEASE , < p10 (release)
Affected: 14.4-RELEASE , < p6 (release)
Affected: 14.3-RELEASE , < p15 (release)
Create a notification for this product.
Date Public
2026-06-09 23:30
Credits
Bumsrakete
Show details on NVD website
To clipboard 

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