Google: sys-kernel/lakitu-kernel-5_10: security update to 17033.0.0

medium Tenable Cloud Security Plugin ID 452130

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: locking/qrwlock: Fix ordering in
queued_write_lock_slowpath() While this code is executed with the wait_lock held, a reader can acquire the
lock without holding wait_lock. The writer side loops checking the value with the
atomic_cond_read_acquire(), but only truly acquires the lock when the compare-and-exchange is completed
successfully which isn’t ordered. This exposes the window between the acquire and the cmpxchg to an A-B-A
problem which allows reads following the lock acquisition to observe values speculatively before the write
lock is truly acquired. We've seen a problem in epoll where the reader does a xchg while holding the read
lock, but the writer can see a value change out from under it. Writer | Reader
-------------------------------------------------------------------------------- ep_scan_ready_list() | |-
write_lock_irq() | |- queued_write_lock_slowpath() | |- atomic_cond_read_acquire() | |
read_lock_irqsave(&ep->lock, flags); --> (observes value before unlock) | chain_epi_lockless() | |
epi->next = xchg(&ep->ovflist, epi); | | read_unlock_irqrestore(&ep->lock, flags); | | |
atomic_cmpxchg_relaxed() | |-- READ_ONCE(ep->ovflist); | A core can order the read of the ovflist ahead of
the atomic_cmpxchg_relaxed(). Switching the cmpxchg to use acquire semantics addresses this issue at which
point the atomic_cond_read can be switched to use relaxed semantics. [peterz: use try_cmpxchg()]
(CVE-2021-46921)

Solution

Update the sys-kernel/lakitu-kernel-5_10 library and its related packages to version 17033.0.0 or later.

Plugin Details

Severity: Medium

ID: 452130

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

Vendor

Vendor Severity: MEDIUM

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2021-46921

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/27/2024

Reference Information

CVE: CVE-2021-46921

Detections

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