Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.731.2

high Tenable Cloud Security Plugin ID 466173

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/sched: sch_teql: Introduce
slaves_lock to avoid race condition and UAF The teql master->slaves singly linked list is not protected
against multiple writes. It can be mod'ed concurently from teql_master_xmit(), teql_dequeue(), teql_init()
and teql_destroy() without holding any list lock or RCU protection. [email protected] has
demonstrated that the qdisc is freed after an RCU grace period, but teql_master_xmit() running on another
CPU can still hold a stale pointer into the list, resulting in a slab-use-after-free: BUG: KASAN: slab-
use-after-free in teql_master_xmit+0xf0f/0x16b0 Read of size 8 at addr ffff888013fb0440 by task poc/332
Freed 512-byte region [ffff888013fb0400, ffff888013fb0600) (kmalloc-512) The fix? Add a per-master
slaves_lock spinlock that serializes all mutations of master->slaves and the NEXT_SLAVE() links in
teql_destroy() and teql_qdisc_init(). teql_master_xmit() also takes the same slaves_lock around those
updates. Annotate master->slaves and the per-slave ->next pointer with __rcu and use the appropriate RCU
accessors everywhere they are touched: rcu_assign_pointer() on the writer side (under slaves_lock),
rcu_dereference_protected() for the writer-side loads (also under slaves_lock), rcu_dereference_bh() for
the loads in teql_master_xmit() and rtnl_dereference() for the loads in
teql_master_open()/teql_master_mtu(), which run under RTNL. Pair this with
rcu_read_lock_bh()/rcu_read_unlock_bh() around the list traversal in teql_master_xmit(), so that readers
either observe a fully linked list or are deferred until the in-flight mutation completes. The two early-
return paths in teql_master_xmit() are updated to release the RCU-bh read-side critical section before
returning, since leaving it held would disable BH on that CPU for good. (CVE-2026-72390)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.731.2 or later.

Plugin Details

Severity: High

ID: 466173

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.16

Vendor

Vendor Severity: LOW

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-2026-72390

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: 8/11/2026

Reference Information

CVE: CVE-2026-72390

Detections

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