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Echo: linux: security update to 6.1.164-1

high Tenable Cloud Security Plugin ID 464279

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: macvlan: fix error recovery in
 macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2
 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0
 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add
 00:00:00:00:00:20 ping -c1 -I p1 1.2.3.4 He also gave a very detailed analysis: <quote valis> The issue is
 triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or
 MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called
 from macvlan_common_newlink() fails (e.g. because of the invalid link name). In this case
 macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink(): This adds a
 reference to vlan to the port's vlan_source_hash using macvlan_source_entry. vlan is a pointer to the priv
 data of the link that is being created. When register_netdevice() fails, the error is returned from
 macvlan_newlink() to rtnl_newlink_create(): if (ops->newlink) err = ops->newlink(dev, &params, extack);
 else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; } and free_netdev() is
 called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached
 to the lower device's macvlan port. Now all packets sent on the macvlan port with a matching source mac
 address will trigger a use-after-free in macvlan_forward_source(). </quote valis> With all that, my fix is
 to make sure we call macvlan_flush_sources() regardless of @create value whenever "goto
 destroy_macvlan_port;" path is taken. Many thanks to valis for following up on this issue.
 (CVE-2026-23209)

Solution

Update the linux library and its related packages to version 6.1.164-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-23209

Plugin Details

Severity: High

ID: 464279

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.25

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-2026-23209

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: 2/15/2026

Vulnerability Publication Date: 2/14/2026

Reference Information

CVE: CVE-2026-23209