NULL pointer dereference in Linux

CVE-2024-36896

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix access violation during port device removal Testing with KASAN and syzkaller revealed a bug in port.c:disable_store(): usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to is concurrently removed, but the function does not check for this possibility before dereferencing the returned value. It turns out that the first dereference is unnecessary, since hub->intfdev is the parent of the port device, so it can be changed easily. Adding a check for hub == NULL prevents further problems. The same bug exists in the disable_show() routine, and it can be fixed the same way.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2024-36896: held from 0.009 to 0.009.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

  • Linux — versions f061f43d7418cb62b8d073e221ec75d3f5b89e17, 6.0, 0
  • Linux Kernel — versions 6.9

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2024-36896?
CVE-2024-36896 is a critical-severity vulnerability in Linux, classified under NULL Pointer Dereference. CVSS score: 9.1/10. Published 2024-05-30.
How severe is CVE-2024-36896?
Critical severity. CVSS v3 base score is 9.1 out of 10.