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🛡️ CVE-2023-52477 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

usb: hub: Guard against accesses to uninitialized BOS descriptors

In the Linux kernel, the following vulnerability has been resolved:

usb: hub: Guard against accesses to uninitialized BOS descriptors

Many functions in drivers/usb/core/hub.c and drivers/usb/core/hub.h

access fields inside udev->bos without checking if it was allocated and

initialized. If usb_get_bos_descriptor() fails for whatever

reason, udev->bos will be NULL and those accesses will result in a

crash:

BUG: kernel NULL pointer dereference, address: 0000000000000018

PGD 0 P4D 0

Oops: 0000 [#1] PREEMPT SMP NOPTI

CPU: 5 PID: 17818 Comm: kworker/5:1 Tainted: G W 5.15.108-18910-gab0e1cb584e1 #1 <HASH:1f9e 1>

Hardware name: Google Kindred/Kindred, BIOS Google_Kindred.12672.413.0 02/03/2021

Workqueue: usb_hub_wq hub_event

RIP: 0010:hub_port_reset+0x193/0x788

Code: 89 f7 e8 20 f7 15 00 48 8b 43 08 80 b8 96 03 00 00 03 75 36 0f b7 88 92 03 00 00 81 f9 10 03 00 00 72 27 48 8b 80 a8 03 00 00 <48> 83 78 18 00 74 19 48 89 df 48 8b 75 b0 ba 02 00 00 00 4c 89 e9

RSP: 0018:ffffab740c53fcf8 EFLAGS: 00010246

RAX: 0000000000000000 RBX: ffffa1bc5f678000 RCX: 0000000000000310

RDX: fffffffffffffdff RSI: 0000000000000286 RDI: ffffa1be9655b840

RBP: ffffab740c53fd70 R08: 00001b7d5edaa20c R09: ffffffffb005e060

R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000

R13: ffffab740c53fd3e R14: 0000000000000032 R15: 0000000000000000

FS: 0000000000000000(0000) GS:ffffa1be96540000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000018 CR3: 000000022e80c005 CR4: 00000000003706e0

Call Trace:

hub_event+0x73f/0x156e

? hub_activate+0x5b7/0x68f

process_one_work+0x1a2/0x487

worker_thread+0x11a/0x288

kthread+0x13a/0x152

? process_one_work+0x487/0x487

? kthread_associate_blkcg+0x70/0x70

ret_from_fork+0x1f/0x30

Fall back to a default behavior if the BOS descriptor isn't accessible

and skip all the functionalities that depend on it: LPM support checks,

Super Speed capabilitiy checks, U1/U2 states setup.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-52477 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.5.8)
  • linux-kernel

Timeline and source

Published on 29 February 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-52477 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-02-29
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.5.8
linux-kernel — —

References

Similar Threats

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