Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6: security update to 19216.739.5

high Tenable Self-Hosted Container Security Plugin ID 475143

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: RDMA/ucma: Serialize join and leave on
copy_to_user failure rdma_join_multicast() queues RoCE work that later reads the ucma_multicast through
event->param.ud.private_data, then list_add()s the CMA multicast at the head of id_priv->mc_list.
rdma_leave_multicast() matches only by sockaddr and destroys the first hit. ucma_process_join() used to
drop ctx->mutex after a successful join and retake it only if copy_to_user() failed. Two concurrent
JOIN_MCAST calls with the same address can therefore insert a second CMA entry before the first thread's
leave. leave then cancels the newer work and the older worker still dereferences the ucma_multicast that
the first thread frees. Keep ctx->mutex held from rdma_join_multicast() through copy_to_user() and, on
-EFAULT, through rdma_leave_multicast() so leave cannot miss this join. Do not leave if join itself
failed: that path never published this address on mc_list, and a leave-by-addr would destroy an earlier
successful join. (CVE-2026-98253)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.739.5 or later.

Plugin Details

Severity: High

ID: 475143

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: 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-2026-98253

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: 10/6/2026

Reference Information

CVE: CVE-2026-98253

Detections

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