NULL pointer dereference in Linux kernel - CVE-2019-19227
Published: November 22, 2019 / Updated: July 17, 2020
Vulnerability identifier: #VU30584
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-19227
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the AppleTalk subsystem in the Linux kernel before 5.1, there is a potential NULL pointer dereference because register_snap_client may return NULL. This will lead to denial of service in net/appletalk/aarp.c and net/appletalk/ddp.c, as demonstrated by unregister_snap_client, aka CID-9804501fa122. A remote attacker can perform a denial of service (DoS) attack.
Affected software
Linux kernel
Slackware Linux
Slackware Linux
How to mitigate CVE-2019-19227
Update to version 5.1.
Linux kernel - update to 5.1
External References
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html
- http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9804501fa1228048857910a6bf23e085aade37cc
- https://lists.debian.org/debian-lts-announce/2020/01/msg00013.html
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
- https://seclists.org/bugtraq/2020/Jan/10
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4254-1/
- https://usn.ubuntu.com/4254-2/
- https://usn.ubuntu.com/4258-1/
- https://usn.ubuntu.com/4287-1/
- https://usn.ubuntu.com/4287-2/