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 20098.0.0

medium Tenable Cloud Security Plugin ID 470940

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: iommu/tegra241-cmdqv: Fix CMD_SYNC
use-after-free on teardown arm_smmu_impl_remove() is registered as a devres action in
arm_smmu_impl_probe(), before arm_smmu_init_queues() allocates smmu->cmdq.q.base. On a devres unwind,
whether a failed probe or an unbind, the queue is freed first and arm_smmu_impl_remove() then runs
tegra241_cmdqv_remove_vintf(), whose VINTF deinit issues a CMD_SYNC on the freed memory. Observed during
testing with a QEMU hack that makes the VCMDQ fail to enable, so the impl reset fails and probe aborts
into the devres unwind: platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: failed to enable,
STATUS=0x00000000 platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: GERRORN=0x0, GERROR=0x4,
CONS=0x0 platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: uncleared error detected, resetting
arm-smmu-v3 arm-smmu-v3.0.auto: failed to reset impl arm-smmu-v3 arm-smmu-v3.0.auto: probe with driver
arm-smmu-v3 failed with error -110 Unable to handle kernel paging request at virtual address
ffff8000891e0098 ... Internal error: Oops: 0000000096000047 [#1] SMP ... Call trace:
arm_smmu_cmdq_issue_cmdlist+0x320/0x6fc (P) tegra241_vcmdq_hw_deinit+0x98/0x168
tegra241_vintf_hw_deinit+0x5c/0x1b0 tegra241_cmdqv_remove_vintf+0x34/0xec tegra241_cmdqv_remove+0x40/0x9c
arm_smmu_impl_remove+0x20/0x30 devm_action_release+0x14/0x20 devres_release_all+0xa8/0x110
device_unbind_cleanup+0x18/0x84 really_probe+0x1f0/0x29c Drop the VINTF deinit from
tegra241_cmdqv_remove_vintf() so the unwind no longer touches the freed queue. Quiesce the VINTFs earlier
instead. Add a device_disable() impl op and run it from arm_smmu_disable_action() while the CMDQ is still
up. That handles a live unbind. A failed reset is already handled because tegra241_vintf_hw_init() deinits
the VINTF on its own error path. tegra241_cmdqv_remove_vintf() is also used by the iommufd viommu destroy
path, so quiesce there too. (CVE-2026-80818)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20098.0.0 or later.

Plugin Details

Severity: Medium

ID: 470940

Version: Revision 1.6

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.63

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-80818

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: 9/4/2026

Reference Information

CVE: CVE-2026-80818

Detections

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