CVE-2024-50100

MEDIUM EPSS 14.0%
Published Nov 5, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Nov 5, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: USB: gadget: dummy-hcd: Fix "task hung" problem The syzbot fuzzer has been encountering "task hung" problems ever since the dummy-hcd driver was changed to use hrtimers instead of regular timers. It turns out that the problems are caused by a subtle difference between the timer_pending() and hrtimer_active() APIs. The changeover blindly replaced the first by the second. However, timer_pending() returns True when the timer is queued but not when its callback is running, whereas hrtimer_active() returns True when the hrtimer is queued _or_ its callback is running. This difference occasionally caused dummy_urb_enqueue() to think that the callback routine had not yet started when in fact it was almost finished. As a result the hrtimer was not restarted, which made it impossible for the driver to dequeue later the URB that was just enqueued. This caused usb_kill_urb() to hang, and things got worse from there. Since hrtimers have no API for telling when they are queued and the callback isn't running, the driver must keep track of this for itself. That's what this patch does, adding a new "timer_pending" flag and setting or clearing it at the appropriate times.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
14.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥6.10  –  <6.11.5
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/5189df7b8088268012882c220d6aca4e64981348
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d85884576a3be3616c260fc1fa862a59579d1ab
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cf7ee2291da551fc4b109fda1f6a332cb8212065
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f828205ee3e4ddc712a13fba6c9902d51e91ddaf
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/5189df7b8088268012882c220d6aca4e64981348
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d85884576a3be3616c260fc1fa862a59579d1ab
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cf7ee2291da551fc4b109fda1f6a332cb8212065
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f828205ee3e4ddc712a13fba6c9902d51e91ddaf
    Patch