{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63905", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.020Z", "datePublished": "2026-07-19T14:55:12.270Z", "dateUpdated": "2026-07-19T14:55:12.270Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T14:55:12.270Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: Fix use after free bug in vudc_remove due to race condition\n\nThis patch follows up Zheng Wang's 2023 report of a use-after-free in\nvudc_remove(). The original thread stalled on Shuah Khan's request for\nruntime testing of the unplug/unbind path. This patch supplies that\ntesting and keeps Zheng's original fix shape.\n\nIn vudc_probe(), v_init_timer() binds udc->tr_timer.timer to v_timer().\nusbip_sockfd_store() starts the timer via v_start_timer()/v_kick_timer().\nvudc_remove() can then free the containing struct vudc while the timer is\nstill pending or executing.\n\nKASAN confirms the race on an unpatched x86_64 QEMU guest with\nCONFIG_KASAN=y, CONFIG_USBIP_VUDC=y, CONFIG_USB_ZERO=y, and a tight loop\nthat repeatedly writes a socket fd to usbip_sockfd, closes the socket\npair, and unbinds/rebinds usbip-vudc.0:\n\n BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x8ba/0x8e0\n Write of size 8 at addr ffff888001b80740 by task trigger_and_unb/239\n Allocated by task 239:\n vudc_probe+0x4d/0xaa0\n Freed by task 239:\n kfree+0x18f/0x520\n device_release_driver_internal+0x388/0x540\n unbind_store+0xd9/0x100\n\nThis lands in the timer core rather than v_timer() itself because the\nembedded timer_list is being walked after its containing struct vudc has\nalready been freed. The underlying lifetime bug is the same one Zheng\nreported.\n\nWith v_stop_timer() called from vudc_remove() and the timer deleted\nsynchronously, the same harness completed 5000 bind/unbind iterations\nwith no KASAN report." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/usbip/vudc_dev.c", "drivers/usb/usbip/vudc_transfer.c" ], "versions": [ { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "61704e5cf9cd7464b510eb606e7e2978b1160a64", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "dcc1c90b28b28b7c493547506297e78653f81952", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "1036ac6148995feaf486014d32bf26bf993c06a9", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "a0638db2340ee053ab0450656a763fd111475e54", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "d07ed707467ce05ea9c03412d0c5ee9d0fe386a6", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "88d459e5b5a46da1ef9fd6f52d9439343edeec88", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "207bf80362df3fce8ebc9723351dcb1bc6d9ed0f", "status": "affected", "versionType": "git" }, { "version": "b6a0ca11186759ad7045d68a5447b1e89f658384", "lessThan": "d96209626a29ea64666be98c30b30ac82e5f1be6", "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/usb/usbip/vudc_dev.c", "drivers/usb/usbip/vudc_transfer.c" ], "versions": [ { "version": "4.7", "status": "affected" }, { "version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.7", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/61704e5cf9cd7464b510eb606e7e2978b1160a64" }, { "url": "https://git.kernel.org/stable/c/dcc1c90b28b28b7c493547506297e78653f81952" }, { "url": "https://git.kernel.org/stable/c/1036ac6148995feaf486014d32bf26bf993c06a9" }, { "url": "https://git.kernel.org/stable/c/a0638db2340ee053ab0450656a763fd111475e54" }, { "url": "https://git.kernel.org/stable/c/d07ed707467ce05ea9c03412d0c5ee9d0fe386a6" }, { "url": "https://git.kernel.org/stable/c/88d459e5b5a46da1ef9fd6f52d9439343edeec88" }, { "url": "https://git.kernel.org/stable/c/207bf80362df3fce8ebc9723351dcb1bc6d9ed0f" }, { "url": "https://git.kernel.org/stable/c/d96209626a29ea64666be98c30b30ac82e5f1be6" } ], "title": "usbip: vudc: Fix use after free bug in vudc_remove due to race condition", "x_generator": { "engine": "bippy-1.2.0" } } } }