CVE-2025-39993— 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imon_disconnect函数中存在竞争条件，可能导致释放后重用。
影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 21677cfc562a27e099719d413287bc8d1d24deb7< 9348976003e39754af344949579e824a0a210fc4 |
affected |
21677cfc562a27e099719d413287bc8d1d24deb7< b03fac6e2a38331faf8510b480becfa90cea1c9f |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< 71c52b073922d05e79e6de7fc7f5f38f927929a4 |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< 71096a6161a25e84acddb89a9d77f138502d26ab |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< 71da40648741d15b302700b68973fe8b382aef3c |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5 |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< d9f6ce99624a41c3bcb29a8d7d79b800665229dd |
affected | ||
21677cfc562a27e099719d413287bc8d1d24deb7< 2e7fd93b9cc565b839bc55a6662475718963e156 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2025-39993 基础信息
漏洞信息
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Vulnerability Title
media: rc: fix races with imon_disconnect()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
media: rc: fix races with imon_disconnect()
Syzbot reports a KASAN issue as below:
BUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]
BUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465
CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
__create_pipe include/linux/usb.h:1945 [inline]
send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991
vfs_write+0x2d7/0xdd0 fs/read_write.c:576
ksys_write+0x127/0x250 fs/read_write.c:631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The iMON driver improperly releases the usb_device reference in
imon_disconnect without coordinating with active users of the
device.
Specifically, the fields usbdev_intf0 and usbdev_intf1 are not
protected by the users counter (ictx->users). During probe,
imon_init_intf0 or imon_init_intf1 increments the usb_device
reference count depending on the interface. However, during
disconnect, usb_put_dev is called unconditionally, regardless of
actual usage.
As a result, if vfd_write or other operations are still in
progress after disconnect, this can lead to a use-after-free of
the usb_device pointer.
Thread 1 vfd_write Thread 2 imon_disconnect
...
if
usb_put_dev(ictx->usbdev_intf0)
else
usb_put_dev(ictx->usbdev_intf1)
...
while
send_packet
if
pipe = usb_sndintpipe(
ictx->usbdev_intf0) UAF
else
pipe = usb_sndctrlpipe(
ictx->usbdev_intf0, 0) UAF
Guard access to usbdev_intf0 and usbdev_intf1 after disconnect by
checking ictx->disconnected in all writer paths. Add early return
with -ENODEV in send_packet(), vfd_write(), lcd_write() and
display_open() if the device is no longer present.
Set and read ictx->disconnected under ictx->lock to ensure memory
synchronization. Acquire the lock in imon_disconnect() before setting
the flag to synchronize with any ongoing operations.
Ensure writers exit early and safely after disconnect before the USB
core proceeds with cleanup.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
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imon_disconnect函数中存在竞争条件，可能导致释放后重用。
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-2025-39993 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-39993 补丁与修复 (2)
同批安全公告 · Linux · 2025-10-15 · 共 34 条
| CVE-2025-39975 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40000 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39969 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39971 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39970 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39972 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39973 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39983 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39982 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39966 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39967 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39976 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39977 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39978 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39979 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39981 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39985 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39986 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39987 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39988 | 7.8 HIGH | Linux kernel 安全漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2025-39993
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