CVE-2017-5548 : Security Advisory and Response
Learn about CVE-2017-5548, a vulnerability in the Linux kernel version 4.9.x before 4.9.6 that allows local users to trigger a denial of service. Find out how to mitigate this issue.
In the Linux kernel version 4.9.x before 4.9.6, a vulnerability exists in the drivers/net/ieee802154/atusb.c module that can be exploited by local users to trigger a denial of service. This flaw arises due to incorrect interaction with the CONFIG_VMAP_STACK option.
Understanding CVE-2017-5548
This CVE entry describes a vulnerability in the Linux kernel that could lead to a denial of service attack.
What is CVE-2017-5548?
The vulnerability in the Linux kernel version 4.9.x before 4.9.6 allows local users to cause a denial of service, system crash, or memory corruption by utilizing multiple virtual pages for a DMA scatterlist.
The Impact of CVE-2017-5548
The vulnerability can be exploited by local users to trigger a denial of service, such as a system crash or memory corruption. It may also have other unspecified effects.
Technical Details of CVE-2017-5548
This section provides detailed technical information about the CVE.
Vulnerability Description
The drivers/net/ieee802154/atusb.c module in the Linux kernel 4.9.x before 4.9.6 interacts incorrectly with the CONFIG_VMAP_STACK option, allowing local users to cause a denial of service or memory corruption.
Affected Systems and Versions
- Affected Version: Linux kernel version 4.9.x before 4.9.6
- Affected Module: drivers/net/ieee802154/atusb.c
Exploitation Mechanism
The vulnerability arises when multiple virtual pages are utilized for a DMA scatterlist, enabling local users to exploit the flaw.
Mitigation and Prevention
Protecting systems from CVE-2017-5548 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the Linux kernel maintainers promptly.
- Monitor official sources for updates and security advisories.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version.
- Implement the principle of least privilege to restrict user access.
Patching and Updates
Ensure timely installation of security patches released by the Linux kernel maintainers to mitigate the vulnerability.