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Fencer Vulns
high 7.8

CVE-2022-3176 json

Use-after-free in io_uring in Linux Kernel

published 2022-09-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-42594

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659

Patch / fix

  • Linux Kernel fc78b2fc21f10c4c9c4d5d659a685710ffa63659
  • linux Debian 14, Debian 13, Debian 12 5.17.3-1

debian advisories DEBIAN-CVE-2022-3176

  • linux Ubuntu 20.04 LTS 5.4.0-128.144
  • linux Ubuntu 22.04 LTS 5.15.0-50.56
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1086.93
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1021.25
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1090.98
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1019.25
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1084.90
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1017.20

ubuntu advisories UBUNTU-CVE-2022-3176

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-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-syms-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-rt_debug Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-source-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.109.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.109.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.109.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.109.1

suse advisories SUSE-SU-2022:4617-1SUSE-SU-2022:4614-1SUSE-SU-2022:4589-1SUSE-SU-2022:4585-1SUSE-SU-2022:4504-1SUSE-SU-2022:4053-1

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-2022-3176 updated cvss 7.0

kernel: use-after-free in io_uring for POLLFREE notification with Signalfd_poll() and binder_poll()

  • 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, python-perf, kernel-kdump, +8 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, +83 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

  • Linux Kernel

Classification

Weakness
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.