CVE-2021-30178: Null Pointer Dereference
First published: Tue Apr 06 2021(Updated: )
An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=5.11.11 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 |
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Reference Links
- 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/IJ5GEETMX3ERQ4DF3GSS2XPNSOOK44OB/
- 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%40lists.fedoraproject.org/message/W5YFGIIF24475A2LNW3UWHW2SNCS3G7M/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGQDVYCDM3F5VXUZIADIV2ERL3AJXNJS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJ5GEETMX3ERQ4DF3GSS2XPNSOOK44OB/
Frequently Asked Questions
What is the severity of CVE-2021-30178?
CVE-2021-30178 has a high severity rating due to the potential for a NULL pointer dereference that can lead to system crashes.
How do I fix CVE-2021-30178?
To fix CVE-2021-30178, update to a patched version of the Linux kernel that is beyond 5.11.11.
What systems are affected by CVE-2021-30178?
CVE-2021-30178 affects the Linux kernel versions up to 5.11.11 and specific versions of Fedora 32, 33, and 34.
What type of vulnerability is CVE-2021-30178?
CVE-2021-30178 is a NULL pointer dereference vulnerability in the SynIC Hyper-V context.
Can CVE-2021-30178 be exploited remotely?
CVE-2021-30178 requires local access to exploit, as it involves dereferencing a NULL pointer in the kernel.
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- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34