Linux kernel TLS receive flaw, exploited in the wild

critical severity · exploited in the wild · published 2025-09-05

A flaw in the kernel's TLS receive path lets a zero-length record skip the intended record handling, so later TLS records are processed on wrong assumptions. It is already being exploited in the wild.

Fixed in: 6.16.4

CVE: CVE-2025-39682

Source: OSV

Am I affected?

You are affected if the installed version is older than 6.16.4. Check the version you have and update to 6.16.4 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 1878 and your operating system.