What is CVE-2022-4127?

CVE-2022-4127 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-11-28.

How severe is CVE-2022-4127?

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

Is CVE-2022-4127 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Linux Kernel

CVE-2022-4127

A NULL pointer dereference issue was discovered in the Linux kernel in io_files_update_with_index_alloc. A local user could use this flaw to potentially crash the system causing a denial of service.

Published 2022-11-28 · 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: 0.002 (10.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Linux Kernel — versions 5.19
Linux Kernel (Io Uring) — versions Fixed in 5.19

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

anonymous-1113/CPE_

References

lore.kernel.org/all/d5a19c1e-9968-e22e-5917-c3139c5e7e89@kernel.dk/ (Patch, Vendor Advisory)
github.com/torvalds/linux/commit/d785a773bed966a75ca1f11d108ae1897189975b (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-4127?: CVE-2022-4127 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-11-28.
How severe is CVE-2022-4127?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2022-4127 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.