What is CVE-2022-1263?

CVE-2022-1263 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-08-31.

How severe is CVE-2022-1263?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Linux Kernel

CVE-2022-1263

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.

Published 2022-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Linux Kernel — versions 5.18
Red Hat Enterprise Linux — versions 8.0, 9.0
Kernel:kvm — versions Fixed in kernel v5.18-rc3

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2022/04/07/1 (Exploit, Mailing List, Third Party Advisory)
github.com/torvalds/linux/commit/5593473a1e6c743764b08e3b6071cb43b5cfa6c4 (Patch, Third Party Advisory)
access.redhat.com/security/cve/CVE-2022-1263 (Third Party Advisory)

Frequently asked questions

What is CVE-2022-1263?: CVE-2022-1263 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-08-31.
How severe is CVE-2022-1263?: Medium severity. CVSS v3 base score is 5.5 out of 10.