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Echo: linux: security update to 6.1.170-1

medium Tenable Self-Hosted Container Security Plugin ID 462229

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: atm: lec: fix null-ptr-deref in
 lec_arp_clear_vccs syzkaller reported a null-ptr-deref in lec_arp_clear_vccs(). This issue can be easily
 reproduced using the syzkaller reproducer. In the ATM LANE (LAN Emulation) module, the same atm_vcc can be
 shared by multiple lec_arp_table entries (e.g., via entry->vcc or entry->recv_vcc). When the underlying
 VCC is closed, lec_vcc_close() iterates over all ARP entries and calls lec_arp_clear_vccs() for each
 matched entry. For example, when lec_vcc_close() iterates through the hlists in priv->lec_arp_empty_ones
 or other ARP tables: 1. In the first iteration, for the first matched ARP entry sharing the VCC,
 lec_arp_clear_vccs() frees the associated vpriv (which is vcc->user_back) and sets vcc->user_back to NULL.
 2. In the second iteration, for the next matched ARP entry sharing the same VCC, lec_arp_clear_vccs() is
 called again. It obtains a NULL vpriv from vcc->user_back (via LEC_VCC_PRIV(vcc)) and then attempts to
 dereference it via `vcc->pop = vpriv->old_pop`, leading to a null-ptr-deref crash. Fix this by adding a
 null check for vpriv before dereferencing it. If vpriv is already NULL, it means the VCC has been cleared
 by a previous call, so we can safely skip the cleanup and just clear the entry's vcc/recv_vcc pointers.
 The entire cleanup block (including vcc_release_async()) is placed inside the vpriv guard because a NULL
 vpriv indicates the VCC has already been fully released by a prior iteration — repeating the teardown
 would redundantly set flags and trigger callbacks on an already-closing socket. The Fixes tag points to
 the initial commit because the entry->vcc path has been vulnerable since the original code. The
 entry->recv_vcc path was later added by commit 8d9f73c0ad2f ("atm: fix a memory leak of vcc->user_back")
 with the same pattern, and both paths are fixed here. (CVE-2026-23286)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-23286

Plugin Details

Severity: Medium

ID: 462229

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

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-2026-23286

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: 3/25/2026

Reference Information

CVE: CVE-2026-23286