Google: sys-kernel/csql-kernel-6_1, sys-kernel/tpusev-kernel-6_6: security update to 18613.534.104

medium Tenable Cloud Security Plugin ID 466368

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: mm/huge_memory: fix folio isn't locked
in softleaf_to_folio() On arm64 server, we found folio that get from migration entry isn't locked in
softleaf_to_folio(). This issue triggers when mTHP splitting and zap_nonpresent_ptes() races, and the root
cause is lack of memory barrier in softleaf_to_folio(). The race is as follows: CPU0 CPU1
deferred_split_scan() zap_nonpresent_ptes() lock folio split_folio() unmap_folio() change ptes to
migration entries __split_folio_to_order() softleaf_to_folio() set flags(including PG_locked) for tail
pages folio = pfn_folio(softleaf_to_pfn(entry)) smp_wmb() VM_WARN_ON_ONCE(!folio_test_locked(folio))
prep_compound_page() for tail pages In __split_folio_to_order(), smp_wmb() guarantees page flags of tail
pages are visible before the tail page becomes non-compound. smp_wmb() should be paired with smp_rmb() in
softleaf_to_folio(), which is missed. As a result, if zap_nonpresent_ptes() accesses migration entry that
stores tail pfn, softleaf_to_folio() may see the updated compound_head of tail page before page->flags.
This issue will trigger VM_WARN_ON_ONCE() in pfn_swap_entry_folio() because of the race between folio
split and zap_nonpresent_ptes() leading to a folio incorrectly undergoing modification without a folio
lock being held. This is a BUG_ON() before commit 93976a20345b ("mm: eliminate further swapops
predicates"), which in merged in v6.19-rc1. To fix it, add missing smp_rmb() if the softleaf entry is
migration entry in softleaf_to_folio() and softleaf_to_page(). [[email protected]: update function
name and comments] (CVE-2026-31466)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.534.104 or later.

Plugin Details

Severity: Medium

ID: 466368

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.44

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2026-31466

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/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: 4/22/2026

Reference Information

CVE: CVE-2026-31466

Detections

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