Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.0.32

medium Tenable Self-Hosted Container Security Plugin ID 469389

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: x86/vmware: Fix hypercall clobbers
Fedora QA reported the following panic: BUG: unable to handle page fault for address: 0000000040003e54
#PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page Hardware name: QEMU
Standard PC (Q35 + ICH9, 2009), BIOS edk2-20251119-3.fc43 11/19/2025 RIP:
0010:vmware_hypercall4.constprop.0+0x52/0x90 .. Call Trace: vmmouse_report_events+0x13e/0x1b0
psmouse_handle_byte+0x15/0x60 ps2_interrupt+0x8a/0xd0 ... because the QEMU VMware mouse emulation is
buggy, and clears the top 32 bits of %rdi that the kernel kept a pointer in. The QEMU vmmouse driver saves
and restores the register state in a "uint32_t data[6];" and as a result restores the state with the high
bits all cleared. RDI originally contained the value of a valid kernel stack address (0xff5eeb3240003e54).
After the vmware hypercall it now contains 0x40003e54, and we get a page fault as a result when it is
dereferenced. The proper fix would be in QEMU, but this works around the issue in the kernel to keep old
setups working, when old kernels had not happened to keep any state in %rdi over the hypercall. In theory
this same issue exists for all the hypercalls in the vmmouse driver; in practice it has only been seen
with vmware_hypercall3() and vmware_hypercall4(). For now, just mark RDI/RSI as clobbered for those two
calls. This should have a minimal effect on code generation overall as it should be rare for the compiler
to want to make RDI/RSI live across hypercalls. (CVE-2026-23215)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.0.32 or later.

Plugin Details

Severity: Medium

ID: 469389

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.66

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-23215

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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: 2/18/2026

Reference Information

CVE: CVE-2026-23215

Detections

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