Google: sys-kernel/csql-kernel-6_1, sys-kernel/lakitu-kernel-6_1: security update to 18244.382.3

medium Tenable Self-Hosted Container Security Plugin ID 450854

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: dm thin: make get_first_thin use rcu-
safe list first function The documentation in rculist.h explains the absence of list_empty_rcu() and
cautions programmers against relying on a list_empty() -> list_first() sequence in RCU safe code. This is
because each of these functions performs its own READ_ONCE() of the list head. This can lead to a
situation where the list_empty() sees a valid list entry, but the subsequent list_first() sees a different
view of list head state after a modification. In the case of dm-thin, this author had a production box
crash from a GP fault in the process_deferred_bios path. This function saw a valid list head in
get_first_thin() but when it subsequently dereferenced that and turned it into a thin_c, it got the inside
of the struct pool, since the list was now empty and referring to itself. The kernel on which this
occurred printed both a warning about a refcount_t being saturated, and a UBSAN error for an out-of-bounds
cpuid access in the queued spinlock, prior to the fault itself. When the resulting kdump was examined, it
was possible to see another thread patiently waiting in thin_dtr's synchronize_rcu. The thin_dtr call
managed to pull the thin_c out of the active thins list (and have it be the last entry in the active_thins
list) at just the wrong moment which lead to this crash. Fortunately, the fix here is straight forward.
Switch get_first_thin() function to use list_first_or_null_rcu() which performs just a single READ_ONCE()
and returns NULL if the list is already empty. This was run against the devicemapper test suite's thin-
provisioning suites for delete and suspend and no regressions were observed. (CVE-2025-21664)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18244.382.3 or later.

Plugin Details

Severity: Medium

ID: 450854

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

Vendor

Vendor Severity: MEDIUM

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-2025-21664

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: 4/9/2024

Reference Information

CVE: CVE-2025-21664

Detections

Analytics