Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6: security update to 19216.739.5

high Tenable Self-Hosted Container Security Plugin ID 475026

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: swiotlb: use the adjusted address for
the highmem page lookup swiotlb_bounce() reads the page frame number from the slot's recorded orig_addr,
then advances orig_addr by tlb_offset to reach the address the caller asked about. The highmem branch
mixes the two: the offset within the page comes from the adjusted address, the page from the value before
it. Once the adjustment crosses a page boundary the pair no longer describes one location, and the whole
copy lands one page below the intended one for a positive tlb_offset, one above for a negative one.
DMA_FROM_DEVICE writes the device data over the wrong page and leaves the intended one stale,
DMA_TO_DEVICE feeds the device from a page the mapping may not cover. Partial syncs through
dma_sync_single_range_for_*() are what make tlb_offset non-zero. The branch test is picked the same way,
so a slot recorded in lowmem can be adjusted into highmem and the lowmem path then hands a highmem address
to phys_to_virt(). Take both from orig_addr once it is final and keep pfn in the branch that uses it.
PhysHighMem() asks the question straight from the address, as dma-debug already does. (CVE-2026-98254)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.739.5 or later.

Plugin Details

Severity: High

ID: 475026

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.4

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-2026-98254

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: 10/6/2026

Reference Information

CVE: CVE-2026-98254

Detections

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