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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 460580

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/packet: fix TOCTOU race on mmap'd
 vnet_hdr in tpacket_snd() In tpacket_snd(), when PACKET_VNET_HDR is enabled, vnet_hdr points directly into
 the mmap'd TX ring buffer shared with userspace. The kernel validates the header via
 __packet_snd_vnet_parse() but then re-reads all fields later in virtio_net_hdr_to_skb(). A concurrent
 userspace thread can modify the vnet_hdr fields between validation and use, bypassing all safety checks.
 The non-TPACKET path (packet_snd()) already correctly copies vnet_hdr to a stack-local variable. All other
 vnet_hdr consumers in the kernel (tun.c, tap.c, virtio_net.c) also use stack copies. The TPACKET TX path
 is the only caller of virtio_net_hdr_to_skb() that reads directly from user-controlled shared memory. Fix
 this by copying vnet_hdr from the mmap'd ring buffer to a stack-local variable before validation and use,
 consistent with the approach used in packet_snd() and all other callers. (CVE-2026-31700)

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-2026-31700

Plugin Details

Severity: High

ID: 460580

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.92

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-31700

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 5/2/2026

Vulnerability Publication Date: 5/1/2026

Reference Information

CVE: CVE-2026-31700