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CVE-2022-2991: ZDI-22-960

A heap-based buffer overflow was found in the Linux kernel’s LightNVM subsystem. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. This vulnerability allows a local attacker to escalate privileges and execute arbitrary code in the context of the kernel. The attacker must first obtain the ability to execute high-privileged code on the target system to exploit this vulnerability.

CVE
#vulnerability#linux#git#buffer_overflow#zero_day

July 11th, 2022

Linux Kernel LightNVM Subsystem Heap-based Overflow Privilege Escalation Vulnerability****ZDI-22-960
ZDI-CAN-17194

CVE ID

CVE-2022-2991

CVSS SCORE

8.2, (AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

AFFECTED VENDORS

Linux

AFFECTED PRODUCTS

Kernel

VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the LightNVM subsystem. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.

ADDITIONAL DETAILS

Linux has issued an update to correct this vulnerability. More details can be found at:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/lightnvm/Kconfig?h=v5.10.114&id=549209caabc89f2877ad5f62d11fca5c052e0e8 https://access.redhat.com/security/cve/CVE-2022-2991

DISCLOSURE TIMELINE

  • 2022-04-27 - Vulnerability reported to vendor
  • 2022-07-11 - Coordinated public release of advisory
  • 2022-08-25 - Advisory Updated

CREDIT

Lucas Leong (@_wmliang_) of Trend Micro Zero Day Initiative

BACK TO ADVISORIES

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