{"id":"CVE-2023-52886","summary":"USB: core: Fix race by not overwriting udev-\u003edescriptor in hub_port_init()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: core: Fix race by not overwriting udev-\u003edescriptor in hub_port_init()\n\nSyzbot reported an out-of-bounds read in sysfs.c:read_descriptors():\n\nBUG: KASAN: slab-out-of-bounds in read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883\nRead of size 8 at addr ffff88801e78b8c8 by task udevd/5011\n\nCPU: 0 PID: 5011 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106\n print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351\n print_report mm/kasan/report.c:462 [inline]\n kasan_report+0x11c/0x130 mm/kasan/report.c:572\n read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883\n...\nAllocated by task 758:\n...\n __do_kmalloc_node mm/slab_common.c:966 [inline]\n __kmalloc+0x5e/0x190 mm/slab_common.c:979\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:680 [inline]\n usb_get_configuration+0x1f7/0x5170 drivers/usb/core/config.c:887\n usb_enumerate_device drivers/usb/core/hub.c:2407 [inline]\n usb_new_device+0x12b0/0x19d0 drivers/usb/core/hub.c:2545\n\nAs analyzed by Khazhy Kumykov, the cause of this bug is a race between\nread_descriptors() and hub_port_init(): The first routine uses a field\nin udev-\u003edescriptor, not expecting it to change, while the second\noverwrites it.\n\nPrior to commit 45bf39f8df7f (\"USB: core: Don't hold device lock while\nreading the \"descriptors\" sysfs file\") this race couldn't occur,\nbecause the routines were mutually exclusive thanks to the device\nlocking.  Removing that locking from read_descriptors() exposed it to\nthe race.\n\nThe best way to fix the bug is to keep hub_port_init() from changing\nudev-\u003edescriptor once udev has been initialized and registered.\nDrivers expect the descriptors stored in the kernel to be immutable;\nwe should not undermine this expectation.  In fact, this change should\nhave been made long ago.\n\nSo now hub_port_init() will take an additional argument, specifying a\nbuffer in which to store the device descriptor it reads.  (If udev has\nnot yet been initialized, the buffer pointer will be NULL and then\nhub_port_init() will store the device descriptor in udev as before.)\nThis eliminates the data race responsible for the out-of-bounds read.\n\nThe changes to hub_port_init() appear more extensive than they really\nare, because of indentation changes resulting from an attempt to avoid\nwriting to other parts of the usb_device structure after it has been\ninitialized.  Similar changes should be made to the code that reads\nthe BOS descriptor, but that can be handled in a separate patch later\non.  This patch is sufficient to fix the bug found by syzbot.","modified":"2026-05-18T05:55:33.089073795Z","published":"2024-07-16T09:40:58.495Z","related":["SUSE-SU-2024:2894-1","SUSE-SU-2024:2902-1","SUSE-SU-2024:2929-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2947-1","SUSE-SU-2024:3194-1","SUSE-SU-2024:3195-1","SUSE-SU-2024:3383-1","SUSE-SU-2025:20044-1","SUSE-SU-2025:20047-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52886.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7fe9d87996062f5eb0ca476ad0257f79bf43aaf5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8186596a663506b1124bede9fde6f243ef9f37ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d241c5d9a9b7ad95c90c6520272fe404d5ac88f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b4a074b1fb222164ed7d5c0b8c922dc4a0840848"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52886.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52886"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"218925bfd5d1436e337c4f961e9c149fbe32de6d"},{"fixed":"9d241c5d9a9b7ad95c90c6520272fe404d5ac88f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"77358093331e9769855140bf94a3f00ecdcf4bb1"},{"fixed":"7fe9d87996062f5eb0ca476ad0257f79bf43aaf5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c87fb861ec185fdc578b4fdc6a05920b6a843840"},{"fixed":"8186596a663506b1124bede9fde6f243ef9f37ee"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065"},{"fixed":"b4a074b1fb222164ed7d5c0b8c922dc4a0840848"},{"fixed":"b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5"},{"fixed":"ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"6badaf880edf51a2da7a439699676394dfdef3e5"},{"last_affected":"5f35b5d3bd6914c68f743741443dfd3a64b0e455"},{"last_affected":"a1e89c8b29d003a20ed2dae6bdae1598d1f23e42"},{"last_affected":"1bcb238c54a9c6dc4bded06b06ba7458a5eefa87"}]}],"versions":["v5.10.194","v5.10.193","v5.10.192","v5.10.191","v5.10.190","v5.10.189","v5.10.188","v5.10.187","v5.10.186","v5.10.185","v5.10.184","v5.10.183","v5.10.182","v5.10.181","v5.10.180","v5.10.179","v5.10.178","v5.10.177","v5.10.176","v5.10.175","v5.10.174","v5.10.173","v5.10.172","v5.10.171","v5.15.131","v5.15.130","v5.15.129","v5.15.128","v5.15.127","v5.15.126","v5.15.125","v5.15.124","v5.15.123","v5.15.122","v5.15.121","v5.15.120","v5.15.119","v5.15.118","v5.15.117","v5.15.116","v5.15.115","v5.15.114","v5.15.113","v5.15.112","v5.15.111","v5.15.110","v5.15.109","v5.15.108","v5.15.107","v5.15.106","v5.15.105","v5.15.104","v5.15.103","v5.15.102","v5.15.101","v5.15.100","v5.15.99","v5.15.98","v5.15.97","v6.1.52","v6.1.51","v6.1.50","v6.1.49","v6.1.48","v6.1.47","v6.1.46","v6.1.45","v6.1.44","v6.1.43","v6.1.42","v6.1.41","v6.1.40","v6.1.39","v6.1.38","v6.1.37","v6.1.36","v6.1.35","v6.1.34","v6.1.33","v6.1.32","v6.1.31","v6.1.30","v6.1.29","v6.1.28","v6.1.27","v6.1.26","v6.1.25","v6.1.24","v6.1.23","v6.1.22","v6.1.21","v6.1.20","v6.1.19","v6.1.18","v6.1.17","v6.1.16","v6.1.15","v6.2-rc6","v4.14.307","v6.2-rc1","v6.2","v6.2.1","v5.4.233","v4.19.274","v5.4.232","v4.19.273","v4.14.306","v6.2-rc2","v6.2-rc8","v5.4.231","v4.19.272","v4.14.305","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v5.4.230","v4.19.271","v4.14.304","v5.4.229","v4.19.270","v4.14.303","v5.4.228","v4.19.269","v4.14.302","v6.1-rc1","v6.1","v5.4.227","v6.1-rc8","v6.1-rc3","v5.4.226","v4.19.268","v4.14.301","v6.1-rc6","v5.4.225","v4.19.267","v4.14.300","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-rc5","v5.4.224","v4.19.266","v4.14.299","v4.19.265","v5.4.223","v4.19.264","v4.14.298","v5.4.222","v4.19.263","v4.14.297","v4.14.296","v5.4.221","v4.19.262","v5.4.220","v6.0-rc1","v5.4.219","v4.19.261","v4.14.295","v5.4.218","v6.0","v5.4.217","v6.0-rc7","v5.4.216","v5.4.215","v4.19.260","v6.0-rc3","v6.0-rc2","v5.4.214","v4.19.259","v4.14.294","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.4.213","v4.19.258","v4.14.293","v4.14.292","v4.19.257","v5.4.212","v5.4.211","v4.19.256","v4.14.291","v5.19","v5.4.210","v4.19.255","v4.14.290","v5.19-rc1","v5.4.209","v4.19.254","v5.4.208","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.4.207","v4.19.253","v4.14.289","v5.19-rc3","v4.19.252","v5.4.206","v4.14.288","v5.19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