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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 459170

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame
 rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing
 the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still
 returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame
 in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can
 hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length
 minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a
 tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning
 -EINVAL, matching the XDP-program error path in the same function. (CVE-2026-46321)

Solution

Update the linux library and its related packages to version 6.1.176-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-46321

Plugin Details

Severity: High

ID: 459170

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3.3

Percentile: 51.09

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-46321

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-46321