Google: sys-kernel/csql-kernel-6_1, sys-kernel/tpusev-kernel-6_6: security update to 18613.439.45

high Tenable Cloud Security Plugin ID 466488

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: Enforce expected_attach_type for
tailcall compatibility Yinhao et al. recently reported: Our fuzzer tool discovered an uninitialized
pointer issue in the bpf_prog_test_run_xdp() function within the Linux kernel's BPF subsystem. This leads
to a NULL pointer dereference when a BPF program attempts to deference the txq member of struct xdp_buff
object. The test initializes two programs of BPF_PROG_TYPE_XDP: progA acts as the entry point for
bpf_prog_test_run_xdp() and its expected_attach_type can neither be of be BPF_XDP_DEVMAP nor
BPF_XDP_CPUMAP. progA calls into a slot of a tailcall map it owns. progB's expected_attach_type must be
BPF_XDP_DEVMAP to pass xdp_is_valid_access() validation. The program returns struct xdp_md's
egress_ifindex, and the latter is only allowed to be accessed under mentioned expected_attach_type. progB
is then inserted into the tailcall which progA calls. The underlying issue goes beyond XDP though. Another
example are programs of type BPF_PROG_TYPE_CGROUP_SOCK_ADDR. sock_addr_is_valid_access() as well as
sock_addr_func_proto() have different logic depending on the programs' expected_attach_type. Similarly, a
program attached to BPF_CGROUP_INET4_GETPEERNAME should not be allowed doing a tailcall into a program
which calls bpf_bind() out of BPF which is only enabled for BPF_CGROUP_INET4_CONNECT. In short, specifying
expected_attach_type allows to open up additional functionality or restrictions beyond what the basic
bpf_prog_type enables. The use of tailcalls must not violate these constraints. Fix it by enforcing
expected_attach_type in __bpf_prog_map_compatible(). Note that we only enforce this for tailcall maps, but
not for BPF devmaps or cpumaps: There, the programs are invoked through dev_map_bpf_prog_run*() and
cpu_map_bpf_prog_run*() which set up a new environment / context and therefore these situations are not
prone to this issue. (CVE-2025-40123)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.439.45 or later.

Plugin Details

Severity: High

ID: 466488

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.12

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-2025-40123

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: 10/23/2025

Reference Information

CVE: CVE-2025-40123

Detections

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