Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6: security update to 18613.534.53

medium Tenable Self-Hosted Container Security Plugin ID 466842

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: x86/efi: defer freeing of boot
services memory efi_free_boot_services() frees memory occupied by EFI_BOOT_SERVICES_CODE and
EFI_BOOT_SERVICES_DATA using memblock_free_late(). There are two issue with that: memblock_free_late()
should be used for memory allocated with memblock_alloc() while the memory reserved with
memblock_reserve() should be freed with free_reserved_area(). More acutely, with
CONFIG_DEFERRED_STRUCT_PAGE_INIT=y efi_free_boot_services() is called before deferred initialization of
the memory map is complete. Benjamin Herrenschmidt reports that this causes a leak of ~140MB of RAM on EC2
t3a.nano instances which only have 512MB or RAM. If the freed memory resides in the areas that memory map
for them is still uninitialized, they won't be actually freed because memblock_free_late() calls
memblock_free_pages() and the latter skips uninitialized pages. Using free_reserved_area() at this point
is also problematic because __free_page() accesses the buddy of the freed page and that again might end up
in uninitialized part of the memory map. Delaying the entire efi_free_boot_services() could be problematic
because in addition to freeing boot services memory it updates efi.memmap without any synchronization and
that's undesirable late in boot when there is concurrency. More robust approach is to only defer freeing
of the EFI boot services memory. Split efi_free_boot_services() in two. First efi_unmap_boot_services()
collects ranges that should be freed into an array then efi_free_boot_services() later frees them after
deferred init is complete. (CVE-2026-23352)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.534.53 or later.

Plugin Details

Severity: Medium

ID: 466842

Version: Revision 1.2

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: Low

Score: 3

Percentile: 23.65

Vendor

Vendor Severity: LOW

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-2026-23352

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: 3/25/2026

Reference Information

CVE: CVE-2026-23352

Detections

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