Detections
Analytics

Echo: linux: security update to 6.12.43-1

high Tenable Cloud Security Plugin ID 457357

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: rcu: Fix rcu_read_unlock() deadloop
 due to IRQ work During rcu_read_unlock_special(), if this happens during irq_exit(), we can lockup if an
 IPI is issued. This is because the IPI itself triggers the irq_exit() path causing a recursive lock up.
 This is precisely what Xiongfeng found when invoking a BPF program on the trace_tick_stop() tracepoint As
 shown in the trace below. Fix by managing the irq_work state correctly. irq_exit() __irq_exit_rcu() /*
 in_hardirq() returns false after this */ preempt_count_sub(HARDIRQ_OFFSET) tick_irq_exit()
 tick_nohz_irq_exit() tick_nohz_stop_sched_tick() trace_tick_stop() /* a bpf prog is hooked on this trace
 point */ __bpf_trace_tick_stop() bpf_trace_run2() rcu_read_unlock_special() /* will send a IPI to itself
 */ irq_work_queue_on(&rdp->defer_qs_iw, rdp->cpu); A simple reproducer can also be obtained by doing the
 following in tick_irq_exit(). It will hang on boot without the patch: static inline void
 tick_irq_exit(void) { + rcu_read_lock(); + WRITE_ONCE(current->rcu_read_unlock_special.b.need_qs, true); +
 rcu_read_unlock(); + [neeraj: Apply Frederic's suggested fix for PREEMPT_RT] (CVE-2025-39744)

Solution

Update the linux library and its related packages to version 6.12.43-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-39744

Plugin Details

Severity: High

ID: 457357

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.27

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2025-39744

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:H/I:N/A:H

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2025

Vulnerability Publication Date: 9/11/2025

Reference Information

CVE: CVE-2025-39744