CVE-2022-1263

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-08-31 · updated 2026-06-17
Weakness: CWE-476

Description

A NULL pointer dereference issue was found in KVM when releasing a vCPU with dirty ring support enabled. This flaw allows an unprivileged local attacker on the host to issue specific ioctl calls, causing a kernel oops condition that results in a denial of service.

Affected products

Linux kernel: before 5.18; 5.18-rc1, 5.18-rc2 — fixed in 5.18
Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: Linux kernel 5.18. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2022-1263
https://bugzilla.redhat.com/show_bug.cgi?id=2072698
https://github.com/torvalds/linux/commit/5593473a1e6c743764b08e3b6071cb43b5cfa6c4
https://www.openwall.com/lists/oss-security/2022/04/07/1
https://access.redhat.com/security/cve/CVE-2022-1263
https://bugzilla.redhat.com/show_bug.cgi?id=2072698
https://github.com/torvalds/linux/commit/5593473a1e6c743764b08e3b6071cb43b5cfa6c4
https://www.openwall.com/lists/oss-security/2022/04/07/1

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