Bottlerocket: bottlerocket-kernel-5.15, kernel-5.15: security update to 5.15.179bottlerocket-kernel-6.1, kernel-6.1: security update to 6.1.131

high Tenable Cloud Security Plugin ID 428196

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: nbd: don't allow reconnect after
disconnect Following process can cause nbd_config UAF: 1) grab nbd_config temporarily; 2)
nbd_genl_disconnect() flush all recv_work() and release the initial reference: nbd_genl_disconnect
nbd_disconnect_and_put nbd_disconnect flush_workqueue(nbd->recv_workq) if
(test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, ...)) nbd_config_put -> due to step 1), reference is still not
zero 3) nbd_genl_reconfigure() queue recv_work() again; nbd_genl_reconfigure config =
nbd_get_config_unlocked(nbd) if (!config) -> succeed if (!test_bit(NBD_RT_BOUND, ...)) -> succeed
nbd_reconnect_socket queue_work(nbd->recv_workq, &args->work) 4) step 1) release the reference; 5)
Finially, recv_work() will trigger UAF: recv_work nbd_config_put(nbd) -> nbd_config is freed
atomic_dec(&config->recv_threads) -> UAF Fix the problem by clearing NBD_RT_BOUND in
nbd_genl_disconnect(), so that nbd_genl_reconfigure() will fail. (CVE-2025-21731)

Plugin Details

Severity: High

ID: 428196

Version: Revision 1.2

Type: Local

Family: Bottlerocket Local Security Checks

Published: 6/30/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

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-2025-21731

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

Vulnerability Publication Date: 2/27/2025

Reference Information

CVE: CVE-2025-21731

Detections

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