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Red Hat: CVE-2021-21781: CVE-2021-21781 kernel: arm: SIGPAGE information disclosure vulnerability (Multiple Advisories)

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Red Hat: CVE-2021-21781: CVE-2021-21781 kernel: arm: SIGPAGE information disclosure vulnerability (Multiple Advisories)

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:N)
Published
08/18/2021
Created
05/14/2022
Added
05/13/2022
Modified
03/13/2024

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

Solution(s)

  • redhat-upgrade-kernel

References

  • CVE-2021-21781
  • RHSA-2022:1988

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