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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19216.104.149

medium Tenable Cloud Security Plugin ID 467681

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: vsock/virtio: Coalesce only linear skb
 vsock/virtio common tries to coalesce buffers in rx queue: if a linear skb (with a spare tail room) is
 followed by a small skb (length limited by GOOD_COPY_LEN = 128), an attempt is made to join them. Since
 the introduction of MSG_ZEROCOPY support, assumption that a small skb will always be linear is incorrect.
 In the zerocopy case, data is lost and the linear skb is appended with uninitialized kernel memory. Of all
 3 supported virtio-based transports, only loopback-transport is affected. G2H virtio-transport rx queue
 operates on explicitly linear skbs; see virtio_vsock_alloc_linear_skb() in virtio_vsock_rx_fill(). H2G
 vhost-transport may allocate non-linear skbs, but only for sizes that are not considered for coalescence;
 see PAGE_ALLOC_COSTLY_ORDER in virtio_vsock_alloc_skb(). Ensure only linear skbs are coalesced. Note that
 skb_tailroom(last_skb) > 0 guarantees last_skb is linear. (CVE-2026-23057)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.104.149 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-125.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 467681

Version: Revision 1.3

Type: Local

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

Percentile: 96.86

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-23057

CVSS v3

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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: 2/4/2026

Reference Information

CVE: CVE-2026-23057