Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.505.8

high Tenable Self-Hosted Container Security Plugin ID 472687

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: nfsd: defer vfree of compound ops to
fix rpc_status UAF The rpc_status netlink dumpit walks every in-flight svc_rqst under rcu_read_lock and,
for NFSv4 requests, reads opnums out of args->ops[]. But args->ops is a separate vmalloc buffer freed
synchronously by vfree() in nfsd4_release_compoundargs() at the end of every compound. The dumpit's
rcu_read_lock pins the svc_rqst struct itself (freed via kfree_rcu), but nothing defers the vfree of the
ops buffer across the RCU grace period. A concurrent compound completion can therefore free the buffer
while the dumpit is reading it — a use-after-free on vmalloc memory. The trailing seqcount recheck
(smp_load_acquire of rq_status_counter) cannot undo a load that already retired against freed memory. Fix
by replacing vfree(args->ops) with kvfree_rcu_mightsleep(), which defers the free until after an RCU grace
period. This makes the existing rcu_read_lock in the dumpit sufficient to protect the read. The tradeoff
is that completed compound ops buffers (up to 200 * sizeof(struct nfsd4_op)) persist in memory slightly
longer, across one grace period, before being reclaimed. (CVE-2026-89690)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.505.8 or later.

Plugin Details

Severity: High

ID: 472687

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/5/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.38

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-89690

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-2026-89690

Detections

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