The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the Linux kernel, the following vulnerability has been resolved: tcp: drop secpath at the same time as     we currently drop dst Xiumei reported hitting the WARN in xfrm6_tunnel_net_exit while running tests that     boil down to: - create a pair of netns - run a basic TCP test over ipcomp6 - delete the pair of netns The     xfrm_state found on spi_byaddr was not deleted at the time we delete the netns, because we still have a     reference on it. This lingering reference comes from a secpath (which holds a ref on the xfrm_state),     which is still attached to an skb. This skb is not leaked, it ends up on sk_receive_queue and then gets     defer-free'd by skb_attempt_defer_free. The problem happens when we defer freeing an skb (push it on one     CPU's defer_list), and don't flush that list before the netns is deleted. In that case, we still have a     reference on the xfrm_state that we don't expect at this point. We already drop the skb's dst in the TCP     receive path when it's no longer needed, so let's also drop the secpath. At this point, tcp_filter has     already called into the LSM hooks that may require the secpath, so it should not be needed anymore.
    However, in some of those places, the MPTCP extension has just been attached to the skb, so we cannot     simply drop all extensions. (CVE-2025-21864)

Note that Nessus relies on the presence of the package as reported by the vendor.

Detections

Analytics

Linux Distros Unpatched Vulnerability : CVE-2025-21864

medium Nessus Plugin ID 243718

Version 1.8

Version 1.7

Version 1.2

Version 1.8 Oct 28, 2025, 5:56 PM Detection (updated detection logic) Plugin Feed: 202510281756
Version 1.7 Oct 27, 2025, 11:56 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:U/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:U/RC:C") Detection (updated detection logic) Plugin Feed: 202510272356
Version 1.2 Sep 1, 2025, 4:30 AM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202509010430