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 472675

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: NFSD: check truncate permission under
inode lock nfsd_setattr() checks whether a size update needs NFSD_MAY_TRUNC before it takes inode_lock().
The comparison uses the file size sampled by that unlocked read, but the actual ATTR_SIZE update is
applied later under inode_lock() by notify_change(). This leaves a TOCTOU window for append-only files. If
a client sends a SETATTR that does not shrink the file at the time of the unlocked sample, a concurrent
append can extend the file before nfsd_setattr() takes inode_lock(). notify_change() then applies a real
truncation without the NFSD_MAY_TRUNC check that rejects IS_APPEND(inode). The VFS truncate syscall paths
perform their own append-only checks before calling notify_change(), so NFSD must make this decision
against the locked size it is about to change. Split the write-count acquisition from the truncation
permission check. Keep get_write_access() before the locked setattr work, then recheck whether the
requested size is below i_size_read(inode) after inode_lock() has been acquired and before
notify_change(ATTR_SIZE). This also avoids the plain unlocked inode->i_size load. (CVE-2026-89713)

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: 472675

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/5/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.42

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-89713

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:N/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: 9/11/2026

Reference Information

CVE: CVE-2026-89713

Detections

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