Google: sys-kernel/cchost-kernel-6_12, sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106

high Tenable Cloud Security Plugin ID 475283

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: udf: Mark LVID buffer as uptodate
before marking it dirty When an I/O error occurs while writing the Logical Volume Integrity Descriptor
(LVID) buffer to the block device, the block layer's completion handler (`end_buffer_write_sync()`) clears
the `BH_Uptodate` flag on the buffer. However, the buffer still contains valid LVID data in memory. If the
filesystem is subsequently remounted read-write or synced, `udf_open_lvid()` or `udf_sync_fs()` will
modify the LVID buffer and call `mark_buffer_dirty()`. This triggers a spurious
`WARN_ON_ONCE(!buffer_uptodate(bh))` warning in `mark_buffer_dirty()` because the buffer is not marked
uptodate, even though its in-memory contents are valid and are about to be overwritten. To prevent this
spurious warning, unconditionally set the `BH_Uptodate` flag before calling `mark_buffer_dirty()` in
`udf_open_lvid()` and `udf_sync_fs()`. This acknowledges that the in-memory buffer is valid and matches
the workaround previously applied to `udf_close_lvid()` in commit 853a0c25baf9 ("udf: Mark LVID buffer as
uptodate before marking it dirty"). Extending this workaround ensures consistent behavior across all LVID
updates. Buffer I/O error on dev loop0, logical block 128, lost sync page write ------------[ cut here
]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x299/0x410
fs/buffer.c:1087 ... Call Trace: <TASK> udf_open_lvid+0x369/0x5b0 fs/udf/super.c:2078
udf_reconfigure+0x336/0x540 fs/udf/super.c:679 reconfigure_super+0x232/0x8f0 fs/super.c:1080
vfs_cmd_reconfigure fs/fsopen.c:268 [inline] vfs_fsconfig_locked+0x171/0x320 fs/fsopen.c:297
__do_sys_fsconfig fs/fsopen.c:463 [inline] __se_sys_fsconfig+0x6b9/0x810 fs/fsopen.c:350
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 </TASK> (CVE-2026-93140)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19999.44.106 or later.

Plugin Details

Severity: High

ID: 475283

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.36

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

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

CVSS Score Source: CVE-2026-93140

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: 9/17/2026

Reference Information

CVE: CVE-2026-93140

Detections

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