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

critical Tenable Cloud Security Plugin ID 469786

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: ext4: fix out-of-bounds read in
ext4_read_inline_dir() ext4_read_inline_dir() can read a dirent header past the end of its inline buffer,
triggering a slab-out-of-bounds read during getdents64(): BUG: KASAN: slab-out-of-bounds in
__ext4_check_dir_entry Read of size 2 at addr ffff88800f3dd23c by task exploit/148 ...
__ext4_check_dir_entry ext4_read_inline_dir iterate_dir The dirent payload lives in a buffer of exactly
inline_size bytes: dir_buf = kmalloc(inline_size, GFP_NOFS); but iteration runs in a position space
extra_offset bytes larger (extra_size = extra_offset + inline_size) so the synthetic "." and ".." land at
their block-dir offsets. A dirent is formed at "dir_buf + pos - extra_offset", yet the
ext4_check_dir_entry() length argument uses the larger extra_size. A position whose dirent header would
extend past extra_size is therefore accepted, and the rescan loop's rec_len probe and
ext4_check_dir_entry() dereference de->rec_len before the entry is rejected. Reject a position whose
minimum-size dirent header would not fit within extra_size before forming de, in both the rescan and main
loops, and pass inline_size rather than extra_size to ext4_check_dir_entry() so the length check matches
the physical buffer. (CVE-2026-89786)

Solution

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

Plugin Details

Severity: Critical

ID: 469786

Version: Revision 1.6

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: 4.3

Percentile: 53.39

Vendor

Vendor Severity: HIGH

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-89786

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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: 9/16/2026

Reference Information

CVE: CVE-2026-89786

Detections

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