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Vulnerability · Published Sep 16, 2022 · Assigned by Google

CVE-2022-3176Use-after-free in io_uring in Linux Kernel

High 7.8

In plain English

A high-severity use-after-free in Kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 77.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.17.3-1DEBIAN-CVE-2022-3176
Debian:13linux5.17.3-1DEBIAN-CVE-2022-3176
Debian:14linux5.17.3-1DEBIAN-CVE-2022-3176
Ubuntu:22.04:LTSlinux5.15.0-50.56USN-5667-1
Ubuntu:22.04:LTSlinux5.15.0-50.56UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-aws5.15.0-1021.25UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-aws5.15.0-1021.25USN-5667-1
Ubuntu:22.04:LTSlinux-azure5.15.0-1021.26UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-azure5.15.0-1021.26USN-5667-1
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1024.30.1UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-gcp5.15.0-1019.25USN-5667-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1019.25UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-gke5.15.0-1017.20USN-5667-1
Ubuntu:22.04:LTSlinux-gke5.15.0-1017.20UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1004.6UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1004.6USN-5667-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1015.17UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-ibm5.15.0-1015.17USN-5683-1
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1017.22USN-5703-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1017.22UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-kvm5.15.0-1019.23USN-5667-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1019.23UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-50.56USN-5667-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-50.56UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1015.15UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-oracle5.15.0-1019.24UBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-oracle5.15.0-1019.24USN-5667-1
Ubuntu:22.04:LTSlinux-raspi5.15.0-1016.18USN-5667-1
Ubuntu:22.04:LTSlinux-raspi5.15.0-1016.18UBUNTU-CVE-2022-3176
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-3176
Ubuntu:22.04:LTSlinux-riscv5.15.0-1020.23UBUNTU-CVE-2022-3176

Affected products (as reported)

VendorProductVersions
Linux Kernel unspecified – before fc78b2fc21f10c4c9c4d5d659a685710ffa63659

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References