CVE-2025-39993

一、漏洞信息
 漏洞编号：[CVE-2025-39993](https://nvd.nist.gov/vuln/detail/CVE-2025-39993)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：N/A None
  Vector：CVSS：3.0/
 漏洞简述：
  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:627Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014Call Trace: <TASK>__dump_stack lib/dump_stack.c:88 [inline]dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106print_address_description mm/kasan/report.c:317 [inline]print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433kasan_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:627vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991vfs_write+0x2d7/0xdd0 fs/read_write.c:576ksys_write+0x127/0x250 fs/read_write.c:631do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdThe iMON driver improperly releases the usb_device reference inimon_disconnect without coordinating with active users of thedevice.Specifically, the fields usbdev_intf0 and usbdev_intf1 are notprotected by the users counter (ictx->users). During probe,imon_init_intf0 or imon_init_intf1 increments the usb_devicereference count depending on the interface. However, duringdisconnect, usb_put_dev is called unconditionally, regardless ofactual usage.As a result, if vfd_write or other operations are still inprogress after disconnect, this can lead to a use-after-free ofthe 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) UAFGuard access to usbdev_intf0 and usbdev_intf1 after disconnect bychecking ictx->disconnected in all writer paths. Add early returnwith -ENODEV in send_packet(), vfd_write(), lcd_write() anddisplay_open() if the device is no longer present.Set and read ictx->disconnected under ictx->lock to ensure memorysynchronization. Acquire the lock in imon_disconnect() before settingthe flag to synchronize with any ongoing operations.Ensure writers exit early and safely after disconnect before the USBcore proceeds with cleanup.Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
 漏洞公开时间：2025-10-15 16:15:37
 漏洞创建时间：2025-10-15 16:53:30
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-39993
<details>
<summary>更多参考(点击展开)</summary>

无
</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  七彩瞬析开源风险感知平台
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| gregkh/linux |  | https://git.kernel.org/stable/c/2e7fd93b9cc565b839bc55a6662475718963e156 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/71da40648741d15b302700b68973fe8b382aef3c |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/d9f6ce99624a41c3bcb29a8d7d79b800665229dd |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/fa0f61cc1d828178aa921475a9b786e7fbb65ccb |  | ljqc |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
                  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:627Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014Call Trace: &lt;TASK&gt;__dump_stack lib/dump_stack.c:88 [inline]dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106print_address_description mm/kasan/report.c:317 [inline]print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433kasan_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:627vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991vfs_write+0x2d7/0xdd0 fs/read_write.c:576ksys_write+0x127/0x250 fs/read_write.c:631do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdThe iMON driver improperly releases the usb_device reference inimon_disconnect without coordinating with active users of thedevice.Specifically, the fields usbdev_intf0 and usbdev_intf1 are notprotected by the users counter (ictx-&gt;users). During probe,imon_init_intf0 or imon_init_intf1 increments the usb_devicereference count depending on the interface. However, duringdisconnect, usb_put_dev is called unconditionally, regardless ofactual usage.As a result, if vfd_write or other operations are still inprogress after disconnect, this can lead to a use-after-free ofthe usb_device pointer.Thread 1 vfd_write                      Thread 2 imon_disconnect                                        ...                                        if                                          usb_put_dev(ictx-&gt;usbdev_intf0)                                        else                                          usb_put_dev(ictx-&gt;usbdev_intf1)...while  send_packet    if      pipe = usb_sndintpipe(        ictx-&gt;usbdev_intf0) UAF    else      pipe = usb_sndctrlpipe(        ictx-&gt;usbdev_intf0, 0) UAFGuard access to usbdev_intf0 and usbdev_intf1 after disconnect bychecking ictx-&gt;disconnected in all writer paths. Add early returnwith -ENODEV in send_packet(), vfd_write(), lcd_write() anddisplay_open() if the device is no longer present.Set and read ictx-&gt;disconnected under ictx-&gt;lock to ensure memorysynchronization. Acquire the lock in imon_disconnect() before settingthe flag to synchronize with any ongoing operations.Ensure writers exit early and safely after disconnect before the USBcore proceeds with cleanup.Found by Linux Verification Center (linuxtesting.org) with Syzkaller.The Linux kernel CVE team has assigned CVE-2025-39993 to this issue.        
 openEuler评分：
  7.0
 Vector：CVSS：3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.openEuler-24.03-LTS:受影响
5.openEuler-24.03-LTS-SP1:受影响
6.openEuler-24.03-LTS-SP2:受影响
7.master(6.12.33):不受影响
8.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
  1.master(6.12.33):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4(5.10.0):否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否

原因说明：
  1.openEuler-22.03-LTS-SP3(5.10.0):正常修复
2.openEuler-22.03-LTS-SP4(5.10.0):正常修复
3.openEuler-24.03-LTS:正常修复
4.openEuler-24.03-LTS-SP1:正常修复
5.openEuler-24.03-LTS-SP2:正常修复
6.openEuler-20.03-LTS-SP4(4.19.90):不修复-超出修复范围
7.master(6.12.33):不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-2636

src-openEuler/kernel
Closed

Content Risk Flag

Comments (13)

src-openEuler/kernelClosed .gitee-modal { width: 500px !important; }

Content Risk Flag

CVE-2025-39993

Comments (13)

Search

src-openEuler/kernel
Closed