Google: sys-kernel/cchost-kernel-6_12, sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106

high Tenable Self-Hosted Container Security Plugin ID 475378

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: PCI/sysfs: Fix out-of-bounds read in
pci_write_legacy_io() pci_write_legacy_io() loads 4 bytes from the kernfs write buffer regardless of how
many bytes userspace wrote: if (count != 1 && count != 2 && count != 4) return -EINVAL; return
pci_legacy_write(bus, off, *(u32 *)buf, count); kernfs_fop_write_iter() allocates the buffer with
kmalloc(len + 1), so a 1-byte write to the legacy_io sysfs file allocates 2 bytes and the unconditional
u32 load reads up to 2 bytes past the end of the allocation, which KASAN reports as a slab-out-of-bounds
read. Similarly, a 2-byte write overreads by 1 byte. Thus, read only the number of bytes requested using
get_unaligned_le16() and get_unaligned_le32() for the 2 and 4 byte cases, interpreting the buffer as
little-endian to match the byte ordering of PCI I/O port space. The PowerPC implementation previously
compensated for the generic code's native-endian 32-bit load by shifting the value into place for the 1
and 2 byte cases. The shifts were only correct on big-endian kernels. On little-endian PowerPC (POWER8 and
later), they extracted the wrong bytes, so a 1-byte write wrote an out-of-bounds byte instead of the
requested value. On big-endian, the native load also caused out_le16() and out_le32() to reverse the
user's bytes on the wire for 2 and 4 byte writes. The little-endian helpers resolve both issues, so the
shifts are removed. No changes are needed for the Alpha platform. The legacy_io file is root-only and
exists only on Alpha and PowerPC, the two architectures that define HAVE_PCI_LEGACY. (CVE-2026-89722)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19999.44.106 or later.

Plugin Details

Severity: High

ID: 475378

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.23

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-89722

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 9/11/2026

Reference Information

CVE: CVE-2026-89722

Detections

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