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Fencer Vulns
high 7.8

CVE-2021-41073 json

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_BUFF…

published 2021-09-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-28224

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • linux linux_kernel 5.10.68, 5.14.7
  • linux Debian 14, Debian 13, Debian 12 5.14.6-2

debian advisories DEBIAN-CVE-2021-41073

  • linux-aws-5.11 Ubuntu 20.04 LTS 5.11.0-1019.20~20.04.1
  • linux-gcp-5.11 Ubuntu 20.04 LTS 5.11.0-1020.22~20.04.1
  • linux-hwe-5.11 Ubuntu 20.04 LTS 5.11.0-37.41~20.04.2
  • linux-oem-5.10 Ubuntu 20.04 LTS 5.10.0-1049.51
  • linux-oem-5.13 Ubuntu 20.04 LTS 5.13.0-1014.18
  • linux-azure-5.11 Ubuntu 20.04 LTS 5.11.0-1017.18~20.04.1
  • linux-riscv-5.11 Ubuntu 20.04 LTS 5.11.0-1020.21~20.04.1
  • linux-oracle-5.11 Ubuntu 20.04 LTS 5.11.0-1019.20~20.04.1

ubuntu advisories UBUNTU-CVE-2021-41073

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel CBL-Mariner 2.0 5.10.78.1-1

azure linux advisories AZL-6596

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • linux Arch Linux 5.14.7.arch1-1
  • linux-zen Arch Linux 5.14.7.zen1-1
  • linux-hardened Arch Linux 5.14.8.hardened1-1
  • linux-lts Arch Linux 5.10.68-1

arch linux advisories AVG-2412AVG-2413AVG-2414AVG-2415

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41073 updated cvss 7.8

kernel: local user privilege escalation via loop_rw_iter in fs/io_uring.c

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.77% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-763 Release of Invalid Pointer or Reference
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.