CVE-2023-52886 (GCVE-0-2023-52886)

Vulnerability from cvelistv5 – Published: 2024-07-16 09:40 – Updated: 2025-05-04 12:49
VLAI?
Title
USB: core: Fix race by not overwriting udev->descriptor in hub_port_init()
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix race by not overwriting udev->descriptor in hub_port_init() Syzbot reported an out-of-bounds read in sysfs.c:read_descriptors(): BUG: KASAN: slab-out-of-bounds in read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883 Read of size 8 at addr ffff88801e78b8c8 by task udevd/5011 CPU: 0 PID: 5011 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883 ... Allocated by task 758: ... __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc+0x5e/0x190 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:680 [inline] usb_get_configuration+0x1f7/0x5170 drivers/usb/core/config.c:887 usb_enumerate_device drivers/usb/core/hub.c:2407 [inline] usb_new_device+0x12b0/0x19d0 drivers/usb/core/hub.c:2545 As analyzed by Khazhy Kumykov, the cause of this bug is a race between read_descriptors() and hub_port_init(): The first routine uses a field in udev->descriptor, not expecting it to change, while the second overwrites it. Prior to commit 45bf39f8df7f ("USB: core: Don't hold device lock while reading the "descriptors" sysfs file") this race couldn't occur, because the routines were mutually exclusive thanks to the device locking. Removing that locking from read_descriptors() exposed it to the race. The best way to fix the bug is to keep hub_port_init() from changing udev->descriptor once udev has been initialized and registered. Drivers expect the descriptors stored in the kernel to be immutable; we should not undermine this expectation. In fact, this change should have been made long ago. So now hub_port_init() will take an additional argument, specifying a buffer in which to store the device descriptor it reads. (If udev has not yet been initialized, the buffer pointer will be NULL and then hub_port_init() will store the device descriptor in udev as before.) This eliminates the data race responsible for the out-of-bounds read. The changes to hub_port_init() appear more extensive than they really are, because of indentation changes resulting from an attempt to avoid writing to other parts of the usb_device structure after it has been initialized. Similar changes should be made to the code that reads the BOS descriptor, but that can be handled in a separate patch later on. This patch is sufficient to fix the bug found by syzbot.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 218925bfd5d1436e337c4f961e9c149fbe32de6d , < 9d241c5d9a9b7ad95c90c6520272fe404d5ac88f (git)
Affected: 77358093331e9769855140bf94a3f00ecdcf4bb1 , < 7fe9d87996062f5eb0ca476ad0257f79bf43aaf5 (git)
Affected: c87fb861ec185fdc578b4fdc6a05920b6a843840 , < 8186596a663506b1124bede9fde6f243ef9f37ee (git)
Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < b4a074b1fb222164ed7d5c0b8c922dc4a0840848 (git)
Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5 (git)
Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b (git)
Affected: 6badaf880edf51a2da7a439699676394dfdef3e5 (git)
Affected: 5f35b5d3bd6914c68f743741443dfd3a64b0e455 (git)
Affected: a1e89c8b29d003a20ed2dae6bdae1598d1f23e42 (git)
Affected: 1bcb238c54a9c6dc4bded06b06ba7458a5eefa87 (git)
Create a notification for this product.
    Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 5.10.195 , ≤ 5.10.* (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"version\": \"6.4.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.5.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/usb/core/hub.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027t hold device lock while\\nreading the \\\"descriptors\\\" sysfs file\\\") this race couldn\u0027t 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.195\", \"versionStartIncluding\": \"5.10.171\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.132\", \"versionStartIncluding\": \"5.15.97\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.53\", \"versionStartIncluding\": \"6.1.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.16\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5.3\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.308\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.275\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.234\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.2.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:49:47.277Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52886\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:49:47.277Z\", \"dateReserved\": \"2024-05-21T15:35:00.782Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T09:40:58.495Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.