Detections
Analytics

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 20198.0.0

high Tenable Cloud Security Plugin ID 475729

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: vlan: require the MAC header to be
 present in __vlan_insert_inner_tag() __vlan_insert_inner_tag() only guarantees head room via
 skb_cow_head(), never that mac_len bytes of MAC header are present. Its ETH_HLEN wrappers -
 __vlan_insert_tag() under skb_vlan_push(), and vlan_insert_tag() under validate_xmit_vlan() on the generic
 transmit path - therefore rewrite the first 16 bytes at skb->data: a 12-byte memmove plus two 2-byte
 stores at +12 and +14. No caller supplies the bound, while the pop helpers use
 skb_ensure_writable()/pskb_may_pull(). An IFF_TUN device has hard_header_len == 0, so packet_snd() accepts
 a one-byte AF_PACKET/SOCK_RAW frame. The first vlan push only sets a hwaccel tag; the next - clsact
 "action vlan push" or bpf_skb_vlan_push() - enters the helper with skb->len still 1. The head comes from
 skbuff_small_head without __GFP_ZERO, so each push drags bytes from beyond skb->tail into the frame. After
 three the one-byte send leaves as 13 bytes carrying 11 bytes of uninitialised slab: 0000: 5a b3 62 12 80
 88 ff ff 00 b3 62 12 81 `------------------------------' only 0x5a was sent; the rest is slab, here the
 top 56 bits of a linear-map address Require the MAC header the helper rewrites to be present, so such a
 frame is dropped rather than transmitted. (CVE-2026-98377)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20198.0.0 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-138.oval.xml.tar.gz

Plugin Details

Severity: High

ID: 475729

Version: Revision 1.1

Type: Local

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 92.98

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-98377

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

Vector: CVSS:3.0/AV:L/AC:L/PR:N/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: 10/9/2026

Reference Information

CVE: CVE-2026-98377