Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.0.109

high Tenable Self-Hosted Container Security Plugin ID 472513

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, arm64: Force 8-byte alignment for
JIT buffer to prevent atomic tearing struct bpf_plt contains a u64 target field. Currently, the BPF JIT
allocator requests an alignment of 4 bytes (sizeof(u32)) for the JIT buffer. Because the base address of
the JIT buffer can be 4-byte aligned (e.g., ending in 0x4 or 0xc), the relative padding logic in
build_plt() fails to ensure that target lands on an 8-byte boundary. This leads to two issues: 1. UBSAN
reports misaligned-access warnings when dereferencing the structure. 2. More critically, target is updated
concurrently via WRITE_ONCE() in bpf_arch_text_poke() while the JIT'd code executes ldr. On arm64, 64-bit
loads/stores are only guaranteed to be single-copy atomic if they are 64-bit aligned. A misaligned target
risks a torn read, causing the JIT to jump to a corrupted address. Fix this by increasing the allocation
alignment requirement to 8 bytes (sizeof(u64)) in bpf_jit_binary_pack_alloc(). This anchors the base of
the JIT buffer to an 8-byte boundary, allowing the relative padding math in build_plt() to correctly align
the target field. (CVE-2026-23383)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.0.109 or later.

Plugin Details

Severity: High

ID: 472513

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.03

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-2026-23383

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: 3/25/2026

Reference Information

CVE: CVE-2026-23383

Detections

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