CVE-2021-21781

LOW

Linux Kernel 5.4.54-5.4.66 - Information Disclosure via ARM SIGPAGE

Title source: llm
STIX 2.1

Description

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujul2022.html

Scores

CVSS v3 3.3
EPSS 0.0002
EPSS Percentile 4.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Details

CWE
CWE-908
Status published
Products (5)
linux/linux_kernel 5.4.54
linux/linux_kernel 5.4.66
oracle/communications_cloud_native_core_binding_support_function 22.1.3
oracle/communications_cloud_native_core_network_exposure_function 22.1.1
oracle/communications_cloud_native_core_policy 22.2.0
Published Aug 18, 2021
Tracked Since Feb 18, 2026