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 19506.549.7

high Tenable Self-Hosted Container Security Plugin ID 475188

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: esp: downgrade zerocopy managed frags
before mutating skb frags On the out-of-place output path (esp->inplace == false) ESP rewrites the skb
frag array: esp_output_head() appends a trailer frag and esp_output_tail() replaces the frags with a
destination page, both referenced with get_page(). When the skb carries zerocopy managed frags
(SKBFL_MANAGED_FRAG_REFS) the payload frags are owned by the ubuf and must not be referenced or
unreferenced individually, but ESP mutates the frag array without ever downgrading the skb. This breaks
the managed-frag invariant two ways: - esp_ssg_unref() walks the source scatterlist and drops a page
reference for every frag, including the ubuf-owned payload frags, pushing their refcount below the GUP pin
bias while the pages are still pinned, i.e. a use-after-free of the zerocopy pages; - esp_output_tail()
installs its destination page as frag 0 with get_page() but leaves SKBFL_MANAGED_FRAG_REFS set, so
skb_release_data() takes the skip_unref branch and never drops that reference, leaking the x->xfrag page
at packet rate. Fix this the way every other frag-mutating site does (__ip_append_data(),
__ip6_append_data(), tcp_sendmsg_locked()) and call skb_zcopy_downgrade_managed() before ESP touches the
frag array: it takes a real reference on each existing frag and clears SKBFL_MANAGED_FRAG_REFS, so the
per-frag unref in esp_ssg_unref() and the frag release in skb_release_data() are both balanced and no
mixed-ownership frag array is left behind. (CVE-2026-98368)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.549.7 or later.

Plugin Details

Severity: High

ID: 475188

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.25

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-2026-98368

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-2026-98368

Detections

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