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 19999.44.106

high Tenable Cloud Security Plugin ID 475510

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: bpf: Reject legacy packet loads from
callbacks check_ld_abs() models a failed BPF_LD_ABS or BPF_LD_IND in a subprogram as an implicit return
with R0 set to zero. It calls prepare_func_exit() to explore this synthesized path. When the load is
reached directly from a synchronous callback, prepare_func_exit() enforces the callback return contract
and marks R0 precise. R0 is not derived from a real instruction on this path, so precision backtracking
reaches the callback call with R0 still requested and triggers the "callback unexpected regs" verifier
bug. A privileged program loader can therefore cause a verifier warning and an -EFAULT BPF_PROG_LOAD.
These legacy packet-load instructions are deprecated. Reject them from callbacks rather than complicating
their implicit-return model. Check all active frames before constructing the implicit return so nested
static subprograms cannot hide the callback context. Global functions are verified independently with a
fresh frame zero, so an active-frame check cannot identify a global function called from a callback. Also
check the complete subprogram call graph during stack-depth validation and reject a function containing a
legacy load when any caller is a callback. This covers global and static descendants without making
has_ld_abs transitive, preserving its per-function BTF return-type check. Ordinary uses outside callbacks
remain supported. (CVE-2026-98044)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19999.44.106 or later.

Plugin Details

Severity: High

ID: 475510

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: 6.3

Percentile: 96.32

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-2026-98044

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 9/25/2026

Reference Information

CVE: CVE-2026-98044

Detections

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