Public proof of conceptFix available

CVE-2021-41073

Q: Is CVE-2021-41073 actively exploited?

Active exploitation of CVE-2021-41073 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-41073?

CVE-2021-41073 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2021-09-19
WeaknessCWE-763

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

loop_rw_iter in fs/io_uring.c in the Linux kernel 5.10 through 5.14.6 allows local users to gain privileges by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer, as demonstrated by using /proc/<pid>/maps for exploitation.

Timeline

dates in UTC

2021-09-1917:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-41073?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-41073?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
33.x	= 33	no fix published	NVD
34.x	= 34	no fix published	NVD

Linux linux kernel

Branch	Affected	Fixed in	Source
5.x	≥ 5.11, < 5.14.7	5.14.7	NVD
5.10	≥ 5.10, < 5.10.68	5.10.68	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD

10 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

git.kernel.orgPatch · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedchompie1337/Linux_LPE_io_uring_CVE-2021-41073WhatsWrongAndWhy/CVE-2021-41073

Sources

NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.07.2read 2026-10-23
NVDweakness (CWE)CWE-763read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-22
PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-09-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-41073?

Is CVE-2021-41073 actively exploited?

Active exploitation of CVE-2021-41073 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41073?

CVE-2021-41073 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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