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Vulnerability · Published Mar 7, 2021 · Assigned by mitre

CVE-2021-27365

High 7.8

In plain English

A high-severity security flaw in the kernel-abi-whitelists package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% 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)2.1%top 18.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.

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:12linux5.10.24-1DEBIAN-CVE-2021-27365
Debian:13linux5.10.24-1DEBIAN-CVE-2021-27365
Debian:14linux5.10.24-1DEBIAN-CVE-2021-27365
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-27365
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-27365
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-27365

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References