CVE-2025-21792— 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，该漏洞源于设置SO_BINDTODEVICE选项时未正确增加引用计数，导致引用计数泄漏。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 24
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9fd75b66b8f68498454d685dc4ba13192ae069b0< 90056ece99966182dc0e367f3fd2afab46ada847 |
affected |
9fd75b66b8f68498454d685dc4ba13192ae069b0< 94a0de224ed52eb2ecd4f4cb1b937b674c9fb955 |
affected | ||
9fd75b66b8f68498454d685dc4ba13192ae069b0< b58f7ca86a7b8e480c06e30c5163c5d2f4e24023 |
affected | ||
9fd75b66b8f68498454d685dc4ba13192ae069b0< 470bda72fda0fcf54300466d70ce2de62f7835d2 |
affected | ||
9fd75b66b8f68498454d685dc4ba13192ae069b0< bca0902e61731a75fc4860c8720168d9f1bae3b6 |
affected | ||
c44a453ffe16eb08acdc6129ac4fa0192dbc0456 |
affected | ||
de55a1338e6a48ff1e41ea8db1432496fbe2a62b |
affected | ||
9e1e088a57c23251f1cfe9601bbd90ade2ea73b9 |
affected | ||
| … +16 条更多 | |||
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一、 漏洞 CVE-2025-21792 基础信息
漏洞信息
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Vulnerability Title
ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt
If an AX25 device is bound to a socket by setting the SO_BINDTODEVICE
socket option, a refcount leak will occur in ax25_release().
Commit 9fd75b66b8f6 ("ax25: Fix refcount leaks caused by ax25_cb_del()")
added decrement of device refcounts in ax25_release(). In order for that
to work correctly the refcounts must already be incremented when the
device is bound to the socket. An AX25 device can be bound to a socket
by either calling ax25_bind() or setting SO_BINDTODEVICE socket option.
In both cases the refcounts should be incremented, but in fact it is done
only in ax25_bind().
This bug leads to the following issue reported by Syzkaller:
================================================================
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 1 PID: 5932 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31
Modules linked in:
CPU: 1 UID: 0 PID: 5932 Comm: syz-executor424 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31
Call Trace:
<TASK>
__refcount_dec include/linux/refcount.h:336 [inline]
refcount_dec include/linux/refcount.h:351 [inline]
ref_tracker_free+0x710/0x820 lib/ref_tracker.c:236
netdev_tracker_free include/linux/netdevice.h:4156 [inline]
netdev_put include/linux/netdevice.h:4173 [inline]
netdev_put include/linux/netdevice.h:4169 [inline]
ax25_release+0x33f/0xa10 net/ax25/af_ax25.c:1069
__sock_release+0xb0/0x270 net/socket.c:640
sock_close+0x1c/0x30 net/socket.c:1408
...
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
</TASK>
================================================================
Fix the implementation of ax25_setsockopt() by adding increment of
refcounts for the new device bound, and decrement of refcounts for
the old unbound device.
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，该漏洞源于设置SO_BINDTODEVICE选项时未正确增加引用计数，导致引用计数泄漏。
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-2025-21792 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21792 补丁与修复 (5)
同批安全公告 · Linux · 2025-02-27 · 共 177 条
| CVE-2025-21805 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21796 | 9.8 CRITICAL | Linux kernel 资源管理错误漏洞 |
| CVE-2025-21707 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21748 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-58006 | 9.6 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-57999 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21735 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-57997 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-57995 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21710 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21766 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-57973 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21762 | 8.1 HIGH | Linux kernel 资源管理错误漏洞 |
| CVE-2025-21765 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21760 | 8.1 HIGH | Linux kernel 资源管理错误漏洞 |
| CVE-2025-21764 | 7.8 HIGH | Linux kernel 资源管理错误漏洞 |
| CVE-2025-21734 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-58008 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-58010 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21791 | 7.8 HIGH | Linux kernel 资源管理错误漏洞 |
显示前 20 条，共 177 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21792
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