Bottlerocket: bottlerocket-kernel-6.12, kernel-6.12: security update to 6.12.22

medium Tenable Cloud Security Plugin ID 428195

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: gso: fix ownership in
__udp_gso_segment In __udp_gso_segment the skb destructor is removed before segmenting the skb but the
socket reference is kept as-is. This is an issue if the original skb is later orphaned as we can hit the
following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0
Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100
__napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 The above can happen following a sequence of
events when using OpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an OVS_ACTION_ATTR_OUTPUT
action: 1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through
queue_gso_packets and then __udp_gso_segment, where its destructor is removed. 2. The segments' data are
copied and sent to userspace. 3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same
original skb is sent to its path. 4. If it later hits skb_orphan, we hit the bug. Fix this by also
removing the reference to the socket in __udp_gso_segment. (CVE-2025-21926)

Plugin Details

Severity: Medium

ID: 428195

Version: Revision 1.4

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: Low

Score: 3

Percentile: 23.19

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-2025-21926

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

Vulnerability Publication Date: 4/1/2025

Reference Information

CVE: CVE-2025-21926

Detections

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