Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.299.3

high Tenable Cloud Security Plugin ID 469187

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/handshake: Use spin_lock_bh for
hn_lock nvmet_tcp_state_change(), a socket callback that runs in BH context, can reach
handshake_req_cancel() via nvmet_tcp_schedule_release_queue() and tls_handshake_cancel().
handshake_req_cancel() acquires hn->hn_lock with plain spin_lock(). If a process-context thread on the
same CPU holds hn->hn_lock when a softirq invokes the cancel path, the lock attempt deadlocks. This is the
only caller that invokes tls_handshake_cancel() from BH context; every other consumer calls it from
process context. Deferring the cancel to process context in the NVMe target is not straightforward:
nvmet_tcp_schedule_release_queue() must call tls_handshake_cancel() atomically with its state transition
to DISCONNECTING. If the cancel were deferred, the handshake completion callback could fire in the window
before the cancel runs, observe the unexpected state, and return without dropping its kref on the queue.
Reworking that interlock is considerably more invasive than hardening the handshake lock. Convert all
hn->hn_lock acquisitions from spin_lock/spin_unlock to spin_lock_bh/spin_unlock_bh so the lock is never
taken with softirqs enabled. (CVE-2026-63980)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.299.3 or later.

Plugin Details

Severity: High

ID: 469187

Version: Revision 1.4

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.58

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-63980

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 6/22/2026

Reference Information

CVE: CVE-2026-63980

Detections

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