{"id":"CVE-2023-52886","state":"PUBLISHED","title":"USB: core: Fix race by not overwriting udev->descriptor in hub_port_init()","description":"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 <TASK>\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.","publishedAt":"2024-07-16T09:40:58.495Z","updatedAt":"2026-05-23T15:27:29.136Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"218925bfd5d1436e337c4f961e9c149fbe32de6d","status":"affected","lessThan":"9d241c5d9a9b7ad95c90c6520272fe404d5ac88f","versionType":"git"},{"version":"77358093331e9769855140bf94a3f00ecdcf4bb1","status":"affected","lessThan":"7fe9d87996062f5eb0ca476ad0257f79bf43aaf5","versionType":"git"},{"version":"c87fb861ec185fdc578b4fdc6a05920b6a843840","status":"affected","lessThan":"8186596a663506b1124bede9fde6f243ef9f37ee","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"b4a074b1fb222164ed7d5c0b8c922dc4a0840848","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b","versionType":"git"},{"version":"6badaf880edf51a2da7a439699676394dfdef3e5","status":"affected","versionType":"git"},{"version":"5f35b5d3bd6914c68f743741443dfd3a64b0e455","status":"affected","versionType":"git"},{"version":"a1e89c8b29d003a20ed2dae6bdae1598d1f23e42","status":"affected","versionType":"git"},{"version":"1bcb238c54a9c6dc4bded06b06ba7458a5eefa87","status":"affected","versionType":"git"},{"version":"5.10.171","status":"affected","lessThan":"5.10.195","versionType":"semver"},{"version":"5.15.97","status":"affected","lessThan":"5.15.132","versionType":"semver"},{"version":"6.1.15","status":"affected","lessThan":"6.1.53","versionType":"semver"},{"version":"4.14.308","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.275","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.234","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.2.2","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/core/hub.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.10.195","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.132","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.53","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.16","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5.3","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/core/hub.c"]}],"references":["https://git.kernel.org/stable/c/9d241c5d9a9b7ad95c90c6520272fe404d5ac88f","https://git.kernel.org/stable/c/7fe9d87996062f5eb0ca476ad0257f79bf43aaf5","https://git.kernel.org/stable/c/8186596a663506b1124bede9fde6f243ef9f37ee","https://git.kernel.org/stable/c/b4a074b1fb222164ed7d5c0b8c922dc4a0840848","https://git.kernel.org/stable/c/b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5","https://git.kernel.org/stable/c/ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52886.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52886","state":"PUBLISHED","datePublished":"2024-07-16T09:40:58.495Z","dateUpdated":"2026-05-23T15:27:29.136Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T15:35:00.782Z"},"containers":{"cna":{"title":"USB: core: Fix race by not overwriting udev->descriptor in hub_port_init()","descriptions":[{"lang":"en","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 <TASK>\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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"218925bfd5d1436e337c4f961e9c149fbe32de6d","status":"affected","lessThan":"9d241c5d9a9b7ad95c90c6520272fe404d5ac88f","versionType":"git"},{"version":"77358093331e9769855140bf94a3f00ecdcf4bb1","status":"affected","lessThan":"7fe9d87996062f5eb0ca476ad0257f79bf43aaf5","versionType":"git"},{"version":"c87fb861ec185fdc578b4fdc6a05920b6a843840","status":"affected","lessThan":"8186596a663506b1124bede9fde6f243ef9f37ee","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"b4a074b1fb222164ed7d5c0b8c922dc4a0840848","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5","versionType":"git"},{"version":"45bf39f8df7f05efb83b302c65ae3b9bc92b7065","status":"affected","lessThan":"ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b","versionType":"git"},{"version":"6badaf880edf51a2da7a439699676394dfdef3e5","status":"affected","versionType":"git"},{"version":"5f35b5d3bd6914c68f743741443dfd3a64b0e455","status":"affected","versionType":"git"},{"version":"a1e89c8b29d003a20ed2dae6bdae1598d1f23e42","status":"affected","versionType":"git"},{"version":"1bcb238c54a9c6dc4bded06b06ba7458a5eefa87","status":"affected","versionType":"git"},{"version":"5.10.171","status":"affected","lessThan":"5.10.195","versionType":"semver"},{"version":"5.15.97","status":"affected","lessThan":"5.15.132","versionType":"semver"},{"version":"6.1.15","status":"affected","lessThan":"6.1.53","versionType":"semver"},{"version":"4.14.308","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.275","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.234","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.2.2","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/core/hub.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.10.195","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.132","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.53","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.16","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5.3","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/core/hub.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9d241c5d9a9b7ad95c90c6520272fe404d5ac88f"},{"url":"https://git.kernel.org/stable/c/7fe9d87996062f5eb0ca476ad0257f79bf43aaf5"},{"url":"https://git.kernel.org/stable/c/8186596a663506b1124bede9fde6f243ef9f37ee"},{"url":"https://git.kernel.org/stable/c/b4a074b1fb222164ed7d5c0b8c922dc4a0840848"},{"url":"https://git.kernel.org/stable/c/b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5"},{"url":"https://git.kernel.org/stable/c/ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:27:29.136Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.171","versionEndExcluding":"5.10.195"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.97","versionEndExcluding":"5.15.132"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.15","versionEndExcluding":"6.1.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.5.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.308"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.275"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.234"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.2"}]}]}],"x_generator":{"engine":"bi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