Home/CVE/An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The
CVE

CVE-2021-21781

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The

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.

LOW · CVSS 3.3 EPSS 0.00016
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-908Use of Uninitialized Resource
CWE-908Use of Uninitialized Resource
▤

Affected Products & Versions

4
linux kernelall versions
oracle communications cloud native core binding support functionall versions
oracle communications cloud native core network exposure functionall versions
oracle communications cloud native core policyall versions
⚠

Public Exploits & PoCs

1
poctalosintelligence.com · TALOS-2021-1243talosintelligence.com
▣

Scoring & Timeline

3.3
LOW · CVSS v3.1 · talos-cna@cisco.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Aug 2021 · 03:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
⚑

Vendor Advisories

10
rhsaRHSA-2022:1988Low
suse-csafSUSE-SU-2021:2756-1
suse-csafopenSUSE-SU-2021:2687-1
suse-csafSUSE-SU-2021:2687-1
suse-csafSUSE-SU-2021:2678-1
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.oracle.com/security-alerts/cpujul2022.htmlPatchThird Party Advisory
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