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 19506.448.8

critical Tenable Cloud Security Plugin ID 469583

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: ntfs3: validate split-point offset in
indx_insert_into_buffer indx_insert_into_buffer() computes used = used1 - to_copy - sp_size; memmove(de_t,
Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off)); where sp and sp_size come from hdr_find_split().
hdr_find_split() walks entries by le16_to_cpu(e->size) without validating that each step stays within
hdr->used or that the size field is at least sizeof(struct NTFS_DE). index_hdr_check(), the on-load
gatekeeper, only validates header-level fields (used, total, de_off) and does not walk per-entry sizes. A
crafted NTFS image whose leaf INDEX_HDR reports used == total but contains one interior NTFS_DE with size
= 0xFFF0 therefore passes validation, descends to indx_insert_into_buffer() through the ntfs_create() ->
indx_insert_entry() path, and makes hdr_find_split() return an sp whose sp_size (0xFFF0) greatly exceeds
the remaining bytes in the buffer. The u32 subtraction underflows and the memmove count becomes a
near-4-GiB value, producing an out-of-bounds kernel write that corrupts adjacent allocations and panics
the kernel. Reproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a single 'touch' inside the
mounted directory; crash site resolves to fs/ntfs3/index.c at the memmove. Trigger requires only local
mount of an attacker-supplied filesystem image (USB, loopback, or removable media auto-mount). Reject the
split whenever the chosen sp plus its declared size already extends past hdr1->used. This is the minimal
fix; it preserves the existing hdr_find_split() contract and relies on the same out: cleanup path as the
pre-existing error returns. A prior OOB read in the very same indx_insert_into_buffer() memmove was fixed
in commit b8c44949044e ("fs/ntfs3: Fix OOB read in indx_insert_into_buffer") by tightening hdr_find_e(),
but that fix does not cover the split-point size field path addressed here: sp is returned by
hdr_find_split(), not hdr_find_e(), and the underflow is driven by sp->size rather than hdr->used
exceeding hdr->total. (CVE-2026-72191)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.448.8 or later.

Plugin Details

Severity: Critical

ID: 469583

Version: Revision 1.5

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-72191

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 8/11/2026

Reference Information

CVE: CVE-2026-72191

Detections

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