Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.505.8

high Tenable Self-Hosted Container Security Plugin ID 469293

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: ata: libata-scsi: fix DSM TRIM for
sector sizes larger than 2048 bytes ata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with
the UNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command. The TRIM descriptor is built by
ata_format_dsm_trim_descr() into the 2048-byte ata_scsi_rbuf staging buffer, and the number of bytes
copied is compared against the logical sector size by the caller: size = ata_format_dsm_trim_descr(scmd,
trmax, block, n_block); if (size != len) /* len == sdp->sector_size */ goto invalid_param_len;
ata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE (2048). On a device whose logical
sector size exceeds that (e.g. a 4Kn device, where sector_size == 4096) the function can never return more
than 2048, while the caller expects it to return sector_size. The comparison therefore always fails, so
every TRIM is rejected with "Parameter list length error" and WARN_ON() splats on each attempt. TRIM /
discard is thus completely broken on such devices. The descriptor was incorrectly sized from the logical
sector size. A DSM TRIM payload is a list of 512-byte pages, each holding up to ATA_MAX_TRIM_RNUM (64) LBA
Range Entries, and is independent of the logical sector size. The Block Limits VPD page already advertises
a single such page as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical blocks), so the
block layer never sends a request that needs more than one page. Emit exactly one 512-byte page,
independent of the logical sector size, and transfer only that page (COUNT == 1). For a 512-byte-sector
device this is unchanged; devices with larger logical sectors now work instead of failing every TRIM.
(CVE-2026-89586)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.505.8 or later.

Plugin Details

Severity: High

ID: 469293

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.55

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-89586

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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: 9/11/2026

Reference Information

CVE: CVE-2026-89586

Detections

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