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CVE-2026-45257 is a local privilege escalation vulnerability in the FreeBSD kernel TLS (KTLS) receive path. The flaw exists because KTLS-RX decrypts TLS records in place, assuming the backing mbufs are anonymous and safe to modify. That assumption fails when data is placed on a socket via sendfile(2), which can use file-backed non-anonymous M_EXTPG pages or EXT_SFBUF mbufs. In the vulnerable path, when a file is sent over a loopback TCP connection without KTLS enabled on the transmit side, those file-backed mbufs can reach the receiver unchanged. The KTLS receive path then performs in-place AES-GCM decryption against memory that still references the backing file's page-cache pages, causing attacker-influenced bytes to be written directly into the page cache rather than into a private buffer. Because the attacker can choose TLS keying material and knows the original file contents, they can control the resulting plaintext bytes written into any file they can read. The overwrite bypasses normal VFS-mediated protections and can affect trusted targets such as setuid binaries.
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A local privilege escalation vulnerability in FreeBSD KTLS that may enable root compromise under certain conditions.
A FreeBSD KTLS vulnerability that may allow local privilege escalation, including through SUID root binaries.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.