{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2023-52886", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: core: Fix race by not overwriting udev->descriptor 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 \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->descriptor, 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->descriptor 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." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "218925bfd5d1", "version_value": "9d241c5d9a9b" }, { "version_affected": "<", "version_name": "77358093331e", "version_value": "7fe9d8799606" }, { "version_affected": "<", "version_name": "c87fb861ec18", "version_value": "8186596a6635" }, { "version_affected": "<", "version_name": "45bf39f8df7f", "version_value": "b4a074b1fb22" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.195", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.132", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.53", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.4.16", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.5.3", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/9d241c5d9a9b7ad95c90c6520272fe404d5ac88f", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/9d241c5d9a9b7ad95c90c6520272fe404d5ac88f" }, { "url": "https://git.kernel.org/stable/c/7fe9d87996062f5eb0ca476ad0257f79bf43aaf5", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/7fe9d87996062f5eb0ca476ad0257f79bf43aaf5" }, { "url": "https://git.kernel.org/stable/c/8186596a663506b1124bede9fde6f243ef9f37ee", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/8186596a663506b1124bede9fde6f243ef9f37ee" }, { "url": "https://git.kernel.org/stable/c/b4a074b1fb222164ed7d5c0b8c922dc4a0840848", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/b4a074b1fb222164ed7d5c0b8c922dc4a0840848" }, { "url": "https://git.kernel.org/stable/c/b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5" }, { "url": "https://git.kernel.org/stable/c/ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }