CVE-2021-30178

low

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

2.5

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-30178

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-30178.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`5.15.2-1`
sles		affected
debian	bookworm	fixed	`0`
debian	bullseye	fixed	`0`
debian	forky	fixed	`0`
debian	sid	fixed	`0`
debian	trixie	fixed	`0`

References

https://www.suse.com/security/cve/CVE-2021-30178.html
https://security-tracker.debian.org/tracker/CVE-2021-30178

Verify integrity in audit chain (admin only). AS-IS.