Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.731.21

high Tenable Self-Hosted Container Security Plugin ID 466268

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: ext4: stop retrying saturated xattr
cache entries ext4_xattr_block_set() retries when a cache entry selected for reuse has a saturated
reference count after taking the buffer lock. The retry returns to the mbcache lookup without making that
entry ineligible, so it can select the same unusable entry indefinitely. A task spinning there can hold
the parent directory's i_rwsem and leave concurrent rmdir callers blocked. Normally a reusable entry has a
reference count below EXT4_XATTR_REFCOUNT_MAX because the count and MBE_REUSABLE_B are updated under the
same buffer lock. A corrupted filesystem can violate that invariant. The syzbot reproducer reports
allocator and xattr corruption before triggering this retry loop. Check the untrusted on-disk count before
incrementing it, avoiding overflow, and clear MBE_REUSABLE_B when it is already saturated. The next lookup
then skips the entry that was just proven unusable. This mirrors the normal transition at
EXT4_XATTR_REFCOUNT_MAX; the release path marks the entry reusable again on the exact 1024-to-1023
transition. Using the same QEMU harness and guest parameters, current unpatched Linux hung in 6 of 8
420-second trials with the do_rmdir signature; representative NMI backtraces caught the owner spinning in
ext4_xattr_block_set(). The patched kernel completed 28 of 28 trials without a hung-task report; the final
twelve trials exercised the reviewed overflow-safe form of the change. syzbot's patch testing also
completed without reproducing the hang. (CVE-2026-80808)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.731.21 or later.

Plugin Details

Severity: High

ID: 466268

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: 4.3

Percentile: 53.48

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.1

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

CVSS Score Source: CVE-2026-80808

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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: 9/4/2026

Reference Information

CVE: CVE-2026-80808

Detections

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