NULL pointer dereference in Linux kernel - CVE-2021-30178
Published: April 7, 2021 / Updated: June 4, 2021
Vulnerability identifier: #VU90668
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-30178
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the synic_get() function in arch/x86/kvm/hyperv.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
Fedora
kernel
Fedora
kernel
How to mitigate CVE-2021-30178
Install update from vendor's website.
kernel - addressed in versions 5.11.13-100.fc32, 5.11.13-200.fc33, 5.11.13-300.fc34
External References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=919f4ebc598701670e80e31573a58f1f2d2bf918
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TGQDVYCDM3F5VXUZIADIV2ERL3AJXNJS/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W5YFGIIF24475A2LNW3UWHW2SNCS3G7M/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IJ5GEETMX3ERQ4DF3GSS2XPNSOOK44OB/