cbcvebase.
CVE-2025-39993
published 2025-10-15

CVE-2025-39993: 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…

PriorityP341high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.15%
4.4th percentile
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: __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( ic

Affected

30 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
debianlinux-6.1< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
linuxlinux
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < 9348976003e39754af344949579e824a0a210fc49348976003e39754af344949579e824a0a210fc4
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < b03fac6e2a38331faf8510b480becfa90cea1c9fb03fac6e2a38331faf8510b480becfa90cea1c9f
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < 71c52b073922d05e79e6de7fc7f5f38f927929a471c52b073922d05e79e6de7fc7f5f38f927929a4
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < 71096a6161a25e84acddb89a9d77f138502d26ab71096a6161a25e84acddb89a9d77f138502d26ab
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < 71da40648741d15b302700b68973fe8b382aef3c71da40648741d15b302700b68973fe8b382aef3c
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < d9f6ce99624a41c3bcb29a8d7d79b800665229ddd9f6ce99624a41c3bcb29a8d7d79b800665229dd
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < 2e7fd93b9cc565b839bc55a6662475718963e1562e7fd93b9cc565b839bc55a6662475718963e156
linuxlinux>= 21677cfc562a27e099719d413287bc8d1d24deb7 < fa0f61cc1d828178aa921475a9b786e7fbb65ccbfa0f61cc1d828178aa921475a9b786e7fbb65ccb
linuxlinux_kernel>= 0 < 5.10.247-15.10.247-1
linuxlinux_kernel>= 0 < 6.1.158-16.1.158-1
linuxlinux_kernel>= 0 < 6.12.57-16.12.57-1
linuxlinux_kernel>= 0 < 6.16.11-16.16.11-1
linuxlinux_kernel>= 0 < 5.15.0-164.1745.15.0-164.174
linuxlinux_kernel>= 0 < 6.8.0-90.916.8.0-90.91
linuxlinux_kernel>= 0 < 4.4.0-277.3114.4.0-277.311
linuxlinux_kernel>= 0 < 4.15.0-246.2584.15.0-246.258
linuxlinux_kernel>= 0 < 5.4.0-224.2445.4.0-224.244
linuxlinux_kernel>= 2.6.35 < 5.4.3015.4.301
linuxlinux_kernel>= 5.11.0 < 5.15.1955.15.195
linuxlinux_kernel>= 5.16.0 < 6.1.1566.1.156
linuxlinux_kernel>= 5.5.0 < 5.10.2465.10.246

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_ubuntu9.8CRITICAL
vendor_msrc7.1HIGH
vendor_redhat7.0MEDIUM
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