#VU92776 Null pointer dereference in Linux kernel - CVE-2019-19462
Vulnerability identifier: #VU92776
Vulnerability risk: Low
CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID:
CWE-ID:
CWE-476
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: Linux Foundation
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
relay_open in kernel/relay.c in the Linux kernel through 5.4.1 allows local users to cause a denial of service (such as relay blockage) by triggering a NULL alloc_percpu result.
Mitigation
Install update from vendor's repository.
Vulnerable software versions
Linux kernel: All versions
External links
https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://lore.kernel.org/lkml/20191129013745.7168-1-dja@axtens.net/
https://security.netapp.com/advisory/ntap-20210129-0004/
https://syzkaller.appspot.com/bug?id=e4265490d26d6c01cd9bc79dc915ef0a1bf15046
https://syzkaller.appspot.com/bug?id=f4d1cb4330bd3ddf4a628332b4285407b2eedd7b
https://syzkaller-ppc64.appspot.com/bug?id=1c09906c83a8ea811a9e318c2a4f8e243becc6f8
https://syzkaller-ppc64.appspot.com/bug?id=b05b4d005191cc375cdf848c3d4d980308d50531
https://usn.ubuntu.com/4414-1/
https://usn.ubuntu.com/4425-1/
https://usn.ubuntu.com/4439-1/
https://usn.ubuntu.com/4440-1/
https://www.debian.org/security/2020/dsa-4698
https://www.debian.org/security/2020/dsa-4699
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
