QID 353140

Date Published: 2022-02-01

QID 353140: Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-011

A null pointer dereference flaw was found in the linux kernel's selinux subsystem.
This flaw occurs while importing the commercial ip security option (cipso) protocol's category bitmap into the selinux extensible bitmap via the' ebitmap_netlbl_import' routine.
While processing the cipso restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated.
This issue leads to a null pointer dereference issue while importing the same category bitmap into selinux.
This flaw allows a remote network user to crash the system kernel, resulting in a denial of service. (
( CVE-2020-10711)



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.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 4.3 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2KERNEL-5.4-2022-011 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353140

    CVE-2020-10711 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2KERNEL-5.4-2022-011 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALASKERNEL-5.4-2022-011.html
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