Google: sys-kernel/csql-kernel-6_1, sys-kernel/lakitu-kernel-6_1: security update to 18244.582.40

medium Tenable Cloud Security Plugin ID 450953

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: bpf: Reject narrower access to pointer
ctx fields The following BPF program, simplified from a syzkaller repro, causes a kernel warning: r0 =
*(u8 *)(r1 + 169); exit; With pointer field sk being at offset 168 in __sk_buff. This access is detected
as a narrower read in bpf_skb_is_valid_access because it doesn't match offsetof(struct __sk_buff, sk). It
is therefore allowed and later proceeds to bpf_convert_ctx_access. Note that for the "is_narrower_load"
case in the convert_ctx_accesses(), the insn->off is aligned, so the cnt may not be 0 because it matches
the offsetof(struct __sk_buff, sk) in the bpf_convert_ctx_access. However, the target_size stays 0 and the
verifier errors with a kernel warning: verifier bug: error during ctx access conversion(1) This patch
fixes that to return a proper "invalid bpf_context access off=X size=Y" error on the load instruction. The
same issue affects multiple other fields in context structures that allow narrow access. Some other non-
affected fields (for sk_msg, sk_lookup, and sockopt) were also changed to use bpf_ctx_range_ptr for
consistency. Note this syzkaller crash was reported in the "Closes" link below, which used to be about a
different bug, fixed in commit fce7bd8e385a ("bpf/verifier: Handle BPF_LOAD_ACQ instructions in
insn_def_regno()"). Because syzbot somehow confused the two bugs, the new crash and repro didn't get
reported to the mailing list. (CVE-2025-38591)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18244.582.40 or later.

Plugin Details

Severity: Medium

ID: 450953

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/1/2026

Updated: 10/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.29

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-38591

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2025-38591

Detections

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