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Echo: linux: security update to 6.1.176-1

critical Tenable Self-Hosted Container Security Plugin ID 465915

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: ipv6: sit: reload inner IPv6 header
 after GSO offloads ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and
 continues using it after iptunnel_handle_offloads(). For GSO skbs, iptunnel_handle_offloads() calls
 skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(),
 which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be
 reloaded after the call. If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6
 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's
 remaining clone is released. Reload iph6 after the offload helper succeeds and before subsequent reads
 from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can
 also replace the skb. (CVE-2026-53228)

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-2026-53228

Plugin Details

Severity: Critical

ID: 465915

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.27

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-53228

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53228