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Vulnerability · Published May 14, 2021 · Assigned by mitre

CVE-2021-33034

High 7.8

In plain English

A high-severity security flaw in the kernel-tools-libs-devel package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.8%top 42.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-305.7.1.el8_4ALSA-2021:2570
Debian:12linux5.10.38-1DEBIAN-CVE-2021-33034
Debian:13linux5.10.38-1DEBIAN-CVE-2021-33034
Debian:14linux5.10.38-1DEBIAN-CVE-2021-33034
Rocky Linux:8kernel0:4.18.0-305.7.1.el8_4RLSA-2021:2570
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-33034
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-33034
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-33034

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References