Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 20085.0.0

high Tenable Cloud Security Plugin ID 471377

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: xfs: bounds-check buffer log item's
dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's
bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT),
item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged
dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise
unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on production kernels.
A crafted image logging a small blf_len together with a bitmap bit past the end of that buffer drives the
memcpy() past the buffer's allocation, corrupting adjacent kernel heap during mount-time log recovery.
This is reachable by anyone who can get a crafted image mounted -- the malicious-filesystem threat model
XFS already guards against elsewhere. Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts
recovery of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail idiom already used in
xlog_recover_do_inode_buffer() and xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore
becomes STATIC int and its three callers propagate the error. Found and confirmed with KASAN on a
CONFIG_XFS_DEBUG=n build: the crafted image trips a slab-out-of-bounds write before this change and fails
recovery cleanly with -EFSCORRUPTED after it. (CVE-2026-80536)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20085.0.0 or later.

Plugin Details

Severity: High

ID: 471377

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: 4.9

Percentile: 58.15

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-80536

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

Vector: CVSS:3.0/AV:L/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: 8/26/2026

Reference Information

CVE: CVE-2026-80536

Detections

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