{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39993","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.150Z","datePublished":"2025-10-15T07:58:18.621Z","dateUpdated":"2026-05-11T21:40:23.999Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:40:23.999Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rc: fix races with imon_disconnect()\n\nSyzbot reports a KASAN issue as below:\nBUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]\nBUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nRead of size 4 at addr ffff8880256fb000 by task syz-executor314/4465\n\nCPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014\nCall Trace:\n <TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433\nkasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n__create_pipe include/linux/usb.h:1945 [inline]\nsend_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nvfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991\nvfs_write+0x2d7/0xdd0 fs/read_write.c:576\nksys_write+0x127/0x250 fs/read_write.c:631\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe iMON driver improperly releases the usb_device reference in\nimon_disconnect without coordinating with active users of the\ndevice.\n\nSpecifically, the fields usbdev_intf0 and usbdev_intf1 are not\nprotected by the users counter (ictx->users). During probe,\nimon_init_intf0 or imon_init_intf1 increments the usb_device\nreference count depending on the interface. However, during\ndisconnect, usb_put_dev is called unconditionally, regardless of\nactual usage.\n\nAs a result, if vfd_write or other operations are still in\nprogress after disconnect, this can lead to a use-after-free of\nthe usb_device pointer.\n\nThread 1 vfd_write                      Thread 2 imon_disconnect\n                                        ...\n                                        if\n                                          usb_put_dev(ictx->usbdev_intf0)\n                                        else\n                                          usb_put_dev(ictx->usbdev_intf1)\n...\nwhile\n  send_packet\n    if\n      pipe = usb_sndintpipe(\n        ictx->usbdev_intf0) UAF\n    else\n      pipe = usb_sndctrlpipe(\n        ictx->usbdev_intf0, 0) UAF\n\nGuard access to usbdev_intf0 and usbdev_intf1 after disconnect by\nchecking ictx->disconnected in all writer paths. Add early return\nwith -ENODEV in send_packet(), vfd_write(), lcd_write() and\ndisplay_open() if the device is no longer present.\n\nSet and read ictx->disconnected under ictx->lock to ensure memory\nsynchronization. Acquire the lock in imon_disconnect() before setting\nthe flag to synchronize with any ongoing operations.\n\nEnsure writers exit early and safely after disconnect before the USB\ncore proceeds with cleanup.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/rc/imon.c"],"versions":[{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"9348976003e39754af344949579e824a0a210fc4","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"b03fac6e2a38331faf8510b480becfa90cea1c9f","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"71c52b073922d05e79e6de7fc7f5f38f927929a4","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"71096a6161a25e84acddb89a9d77f138502d26ab","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"71da40648741d15b302700b68973fe8b382aef3c","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"d9f6ce99624a41c3bcb29a8d7d79b800665229dd","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"2e7fd93b9cc565b839bc55a6662475718963e156","status":"affected","versionType":"git"},{"version":"21677cfc562a27e099719d413287bc8d1d24deb7","lessThan":"fa0f61cc1d828178aa921475a9b786e7fbb65ccb","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/rc/imon.c"],"versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","status":"unaffected","versionType":"semver"},{"version":"5.4.301","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.246","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.195","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.156","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.110","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.51","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.11","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17.1","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.4.301"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.10.246"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.15.195"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.1.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.6.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.12.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.16.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.17.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9348976003e39754af344949579e824a0a210fc4"},{"url":"https://git.kernel.org/stable/c/b03fac6e2a38331faf8510b480becfa90cea1c9f"},{"url":"https://git.kernel.org/stable/c/71c52b073922d05e79e6de7fc7f5f38f927929a4"},{"url":"https://git.kernel.org/stable/c/71096a6161a25e84acddb89a9d77f138502d26ab"},{"url":"https://git.kernel.org/stable/c/71da40648741d15b302700b68973fe8b382aef3c"},{"url":"https://git.kernel.org/stable/c/fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5"},{"url":"https://git.kernel.org/stable/c/d9f6ce99624a41c3bcb29a8d7d79b800665229dd"},{"url":"https://git.kernel.org/stable/c/2e7fd93b9cc565b839bc55a6662475718963e156"},{"url":"https://git.kernel.org/stable/c/fa0f61cc1d828178aa921475a9b786e7fbb65ccb"}],"title":"media: rc: fix races with imon_disconnect()","x_generator":{"engine":"bippy-1.2.0"}}}}