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Vulnerability · Published Jan 29, 2021 · Assigned by mitre

CVE-2021-3347

High 7.8

In plain English

A high-severity use-after-free in the kernel-abi-whitelists package (AlmaLinux). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)1.4%top 28.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official description

An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-abi-whitelists4.18.0-240.22.1.el8_3ALSA-2021:1093
AlmaLinux:8kernel-tools-libs-devel4.18.0-240.22.1.el8_3ALSA-2021:1093
Debian:12linux5.10.12-1DEBIAN-CVE-2021-3347
Debian:13linux5.10.12-1DEBIAN-CVE-2021-3347
Debian:14linux5.10.12-1DEBIAN-CVE-2021-3347
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3347
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3347
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3347

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

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

References