Google: sys-kernel/csql-kernel-6_1, sys-kernel/lakitu-kernel-6_1: security update to 18244.85.5

medium Tenable Cloud Security Plugin ID 450638

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: bpf: Fix racing between
bpf_timer_cancel_and_free and bpf_timer_cancel The following race is possible between
bpf_timer_cancel_and_free and bpf_timer_cancel. It will lead a UAF on the timer->timer.
bpf_timer_cancel(); spin_lock(); t = timer->time; spin_unlock(); bpf_timer_cancel_and_free(); spin_lock();
t = timer->timer; timer->timer = NULL; spin_unlock(); hrtimer_cancel(&t->timer); kfree(t); /* UAF on t */
hrtimer_cancel(&t->timer); In bpf_timer_cancel_and_free, this patch frees the timer->timer after a rcu
grace period. This requires a rcu_head addition to the "struct bpf_hrtimer". Another kfree(t) happens in
bpf_timer_init, this does not need a kfree_rcu because it is still under the spin_lock and timer->timer
has not been visible by others yet. In bpf_timer_cancel, rcu_read_lock() is added because this helper can
be used in a non rcu critical section context (e.g. from a sleepable bpf prog). Other timer->timer usages
in helpers.c have been audited, bpf_timer_cancel() is the only place where timer->timer is used outside of
the spin_lock. Another solution considered is to mark a t->flag in bpf_timer_cancel and clear it after
hrtimer_cancel() is done. In bpf_timer_cancel_and_free, it busy waits for the flag to be cleared before
kfree(t). This patch goes with a straight forward solution and frees timer->timer after a rcu grace
period. (CVE-2024-26737)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18244.85.5 or later.

Plugin Details

Severity: Medium

ID: 450638

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: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2024-26737

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:N/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: 3/23/2024

Reference Information

CVE: CVE-2024-26737

Detections

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