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 19804.0.0

high Tenable Cloud Security Plugin ID 471002

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: crypto: acomp - fix wrong pointer
stored by acomp_save_req() acomp_save_req() stores &req->chain in req->base.data. When
acomp_reqchain_done() is invoked on asynchronous completion, it receives &req->chain as the data argument
but casts it directly to struct acomp_req. Since data points to the chain member, all subsequent field
accesses are at a wrong offset, resulting in memory corruption. The issue occurs when an asynchronous
hardware implementation, such as the QAT driver, completes a request that uses the DMA virtual address
interface (e.g. acomp_request_set_src_dma()). This combination causes crypto_acomp_compress() to enter the
acomp_do_req_chain() path, which sets acomp_reqchain_done() as the completion callback via
acomp_save_req(). With KASAN enabled, this manifests as a general protection fault in
acomp_reqchain_done(): general protection fault, probably for non-canonical address 0xe000040000000000
KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007] RIP:
0010:acomp_reqchain_done+0x15b/0x4e0 Call Trace: <IRQ> qat_comp_alg_callback+0x5d/0xa0 [intel_qat]
adf_ring_response_handler+0x376/0x8b0 [intel_qat] adf_response_handler+0x60/0x170 [intel_qat]
tasklet_action_common+0x223/0x820 handle_softirqs+0x1ab/0x640 </IRQ> Fix this by storing the request
itself in req->base.data instead of &req->chain, so that acomp_reqchain_done() receives the correct
pointer. Simplify acomp_restore_req() accordingly to access req->chain directly. (CVE-2026-46081)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19804.0.0 or later.

Plugin Details

Severity: High

ID: 471002

Version: Revision 1.6

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.98

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-2026-46081

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: 5/26/2026

Reference Information

CVE: CVE-2026-46081

Detections

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