CVE-2023-53478— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于last_cmd变量存在竞争条件，可能导致释放后重用或双重释放。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 27c888da9867725784bad3d6455d6e53b425fa2b< 9fe183f659a2704255e5d84f6ae308c234a113ec |
affected |
27c888da9867725784bad3d6455d6e53b425fa2b< 8826d9e7bd51e7656f78baa4472e8e2f5e7069f0 |
affected | ||
27c888da9867725784bad3d6455d6e53b425fa2b< 4ccf11c4e8a8e051499d53a12f502196c97a758e |
affected | ||
5.18 |
affected | ||
< 5.18 |
unaffected | ||
6.1.24≤ 6.1.* |
unaffected | ||
6.2.11≤ 6.2.* |
unaffected | ||
6.3≤ * |
unaffected |
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一、 漏洞 CVE-2023-53478 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
tracing/synthetic: Fix races on freeing last_cmd
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tracing/synthetic: Fix races on freeing last_cmd
Currently, the "last_cmd" variable can be accessed by multiple processes
asynchronously when multiple users manipulate synthetic_events node
at the same time, it could lead to use-after-free or double-free.
This patch add "lastcmd_mutex" to prevent "last_cmd" from being accessed
asynchronously.
================================================================
It's easy to reproduce in the KASAN environment by running the two
scripts below in different shells.
script 1:
while :
do
echo -n -e '\x88' > /sys/kernel/tracing/synthetic_events
done
script 2:
while :
do
echo -n -e '\xb0' > /sys/kernel/tracing/synthetic_events
done
================================================================
double-free scenario:
process A process B
------------------- ---------------
1.kstrdup last_cmd
2.free last_cmd
3.free last_cmd(double-free)
================================================================
use-after-free scenario:
process A process B
------------------- ---------------
1.kstrdup last_cmd
2.free last_cmd
3.tracing_log_err(use-after-free)
================================================================
Appendix 1. KASAN report double-free:
BUG: KASAN: double-free in kfree+0xdc/0x1d4
Free of addr ***** by task sh/4879
Call trace:
...
kfree+0xdc/0x1d4
create_or_delete_synth_event+0x60/0x1e8
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
Allocated by task 4879:
...
kstrdup+0x5c/0x98
create_or_delete_synth_event+0x6c/0x1e8
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
Freed by task 5464:
...
kfree+0xdc/0x1d4
create_or_delete_synth_event+0x60/0x1e8
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
================================================================
Appendix 2. KASAN report use-after-free:
BUG: KASAN: use-after-free in strlen+0x5c/0x7c
Read of size 1 at addr ***** by task sh/5483
sh: CPU: 7 PID: 5483 Comm: sh
...
__asan_report_load1_noabort+0x34/0x44
strlen+0x5c/0x7c
tracing_log_err+0x60/0x444
create_or_delete_synth_event+0xc4/0x204
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
Allocated by task 5483:
...
kstrdup+0x5c/0x98
create_or_delete_synth_event+0x80/0x204
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
Freed by task 5480:
...
kfree+0xdc/0x1d4
create_or_delete_synth_event+0x74/0x204
trace_parse_run_command+0x2bc/0x4b8
synth_events_write+0x20/0x30
vfs_write+0x200/0x830
...
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于last_cmd变量存在竞争条件，可能导致释放后重用或双重释放。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2023-53478 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-10-01 · 共 169 条
| CVE-2023-53517 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53454 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39918 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39919 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50442 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53493 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50421 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53484 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50440 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50454 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53465 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39924 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53510 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39927 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53506 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50437 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53495 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53494 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50432 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53492 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 169 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2023-53478
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