Detections
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Echo: linux: security update to 6.1.176-1

medium Tenable Cloud Security Plugin ID 458049

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: net: sched: act_csum: validate nested
 VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries
 in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN
 bytes without first ensuring that the full VLAN header is present in the linear area. If only part of an
 inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the
 following skb_pull(VLAN_HLEN) may violate skb invariants. Fix this by requiring pskb_may_pull(skb,
 VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully
 available, drop the packet through the existing error path. (CVE-2026-31684)

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-2026-31684

Plugin Details

Severity: Medium

ID: 458049

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.44

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-31684

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/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: 5/1/2026

Vulnerability Publication Date: 4/25/2026

Reference Information

CVE: CVE-2026-31684