Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.675.2

high Tenable Cloud Security Plugin ID 466217

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: ipv6: validate extension header length
before copying to cmsg ip6_datagram_recv_specific_ctl() builds IPV6_{HOPOPTS,DSTOPTS,RTHDR} cmsgs (and
their IPV6_2292* legacy counterparts) by trusting the on-wire hdrlen byte (ptr[1]) when computing the
put_cmsg() length. The length was validated only at parse time (ipv6_parse_hopopts(), etc.). An nftables
payload-write expression can rewrite hdrlen after parsing and before the skb reaches recvmsg; the write
itself is in-bounds but put_cmsg() then reads up to ((hdrlen+1) << 3) = 2040 bytes from an 8-byte header.
nftables is reachable from an unprivileged user namespace, so this is an unprivileged slab-out-of-bounds
read: BUG: KASAN: slab-out-of-bounds in put_cmsg+0x3ac/0x540 put_cmsg+0x3ac/0x540
udpv6_recvmsg+0xca0/0x1250 sock_recvmsg+0xdf/0x190 ____sys_recvmsg+0x1b1/0x620 Add ipv6_get_exthdr_len()
which validates that at least two bytes are accessible before reading the hdrlen field, then checks the
computed length against skb_tail_pointer(skb), returning 0 on failure. Extension headers are kept in the
linear skb area by pskb_may_pull() during input, so skb_tail_pointer() is the correct bound. Use
ipv6_get_exthdr_len() at all non-AH call sites: the five standalone cmsg blocks (HbH, 2292HbH, 2292DSTOPTS
x2, 2292RTHDR) and the three standard cases in the extension-header walk loop (DSTOPTS, ROUTING, default).
AH retains an inline bounds check because its length formula differs ((ptr[1]+2)<<2). The walk loop also
gets a pre-read bounds check at the top to validate ptr before any case accesses ptr[0] or ptr[1]. When
the walk loop detects a corrupted header, return from the function instead of continuing to process later
socket options. (CVE-2026-63920)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.675.2 or later.

Plugin Details

Severity: High

ID: 466217

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.36

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2026-63920

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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: 6/22/2026

Reference Information

CVE: CVE-2026-63920

Detections

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