QID 352500

Date Published: 2021-07-29

QID 352500: Amazon Linux Security Advisory for kernel: ALAS2-2021-1691

An out-of-bounds write flaw was found in the linux kernel's seq_file in the filesystem layer.
This flaw allows a local attacker with a user privilege to gain access to out-of-bound memory, leading to a system crash or a leak of internal kernel information.
The issue results from not validating the size_t-to-int conversion prior to performing operations.
The highest threat from this vulnerability is to data integrity, confidentiality and system availability. (
( CVE-2021-33909)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as High - 7.2 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1691 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352500

    CVE-2021-33909 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1691 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1691.html
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