Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.505.8

high Tenable Self-Hosted Container Security Plugin ID 469505

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: fs/ntfs3: fix info-leak on partial
LZNT decompress in ni_read_frame() ni_read_frame() decompresses an LZNT $DATA frame into the vmapped
target pages and then trusts decompress_lznt()'s return value: unc_size = decompress_lznt(frame_ondisk,
ondisk_size, frame_mem, frame_size); if ((ssize_t)unc_size < 0) err = unc_size; else if (!unc_size ||
unc_size > frame_size) err = -EINVAL; decompress_lznt() stops as soon as the compressed stream is
exhausted (e.g. a zero chunk header) and returns the number of bytes it actually wrote, which may be far
less than frame_size. The bytes between unc_size and frame_size are never written. The only memset() that
follows zeroes the region beyond i_valid; when the frame lies entirely within the file's valid size that
memset() does not run, so the gap retains whatever was in the just-vmapped pages. All pages are then
marked uptodate and returned to userspace, disclosing uninitialized (recently-freed) kernel page memory. A
crafted compressed file whose stream decompresses to only a few bytes leaks the remainder of every frame
on a plain read(2), which is enough to recover kernel pointers and defeat KASLR. Zero the [unc_size,
frame_size) tail immediately after a successful LZNT decompress so the remainder reads back as zero.
(CVE-2026-89616)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.505.8 or later.

Plugin Details

Severity: High

ID: 469505

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.66

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-89616

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/11/2026

Reference Information

CVE: CVE-2026-89616

Detections

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