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Vulnerability · Published Jul 20, 2021 · Assigned by mitre

CVE-2021-33909

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 9.8% (higher than 96% 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)9.8%top 4.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-305.10.2.el8_4ALSA-2021:2714
Debian:12linux5.10.46-2DEBIAN-CVE-2021-33909
Debian:13linux5.10.46-2DEBIAN-CVE-2021-33909
Debian:14linux5.10.46-2DEBIAN-CVE-2021-33909
Rocky Linux:8kernel0:4.18.0-305.10.2.el8_4RLSA-2021:2714
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-33909
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-33909
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-33909

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References