Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_6: security update to 19216.220.185

medium Tenable Cloud Security Plugin ID 472494

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: KVM: SEV: Drop WARN on large size for
KVM_MEMORY_ENCRYPT_REG_REGION Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN
is comically trivially to trigger from userspace, e.g. by doing: struct kvm_enc_region range = { .addr =
0, .size = -1ul, }; __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range); Note, the checks in
sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely
worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than
ULONG_MAX. That wart will be cleaned up in the near future. if (range->addr > ULONG_MAX || range->size >
ULONG_MAX) return -EINVAL; Opportunistically add a comment to explain why the code calculates the number
of pages the "hard" way, e.g. instead of just shifting @ulen. (CVE-2026-31590)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.220.185 or later.

Plugin Details

Severity: Medium

ID: 472494

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: 23.73

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-2026-31590

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: 4/24/2026

Reference Information

CVE: CVE-2026-31590

Detections

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