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Echo: linux: security update to 6.1.176-1

medium Tenable Cloud Security Plugin ID 461110

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: 6lowpan: fix off-by-one in multicast
 context address compression The second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses &data[1] as
 destination and &ipaddr->s6_addr[11] as source, but both should be offset by one: &data[2] and
 &ipaddr->s6_addr[12] respectively. This off-by-one has two consequences: 1. data[1] is overwritten with
 s6_addr[11], corrupting the RIID field in the compressed multicast address 2. data[5] is never written, so
 uninitialized kernel stack memory is transmitted over the network via lowpan_push_hc_data(), leaking
 kernel stack contents The correct inline data layout must match what the decompression function
 lowpan_uncompress_multicast_ctx_daddr() expects: data[0..1] = s6_addr[1..2] (flags/scope + RIID)
 data[2..5] = s6_addr[12..15] (group ID) Also zero-initialize the data array as a defensive measure against
 similar bugs in the future. (CVE-2026-53263)

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-2026-53263

Plugin Details

Severity: Medium

ID: 461110

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.3

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-2026-53263

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: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53263