QID 353989

Date Published: 2022-07-25

QID 353989: Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-027

A race condition accessing file object in the linux kernel overlayfs subsystem was found in the way users do rename in specific way with overlayfs.
A local user could use this flaw to crash the system. (
( CVE-2021-20321) a flaw was found in the linux kernel.
A memory leak in the ccp-ops crypto driver can allow attackers to cause a denial of service.
This vulnerability is similar with the older( CVE-2019-18808.
The highest threat from this vulnerability is to system availability. (
( CVE-2021-3744) a memory leak flaw was found in the linux kernel's ccp_run_aes_gcm_cmd() function that allows an attacker to cause a denial of service.
The vulnerability is similar to the older( CVE-2019-18808.
( CVE-2021-3764) an out-of-bounds (oob) memory write flaw was found in prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the bpf in the linux kernel.
In this flaw, the multiplication to calculate the size could lead to an integer overflow which could allow a local attacker, with a special user privilege, to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. (
( CVE-2021-41864)



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 High - 7.8 severity.
  • CVSS V2 rated as Medium - 4.6 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2KERNEL-5.4-2022-027 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353989

    CVE-2021-3744 | CVE-2021-41864 | CVE-2021-20321 | CVE-2021-3764 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2KERNEL-5.4-2022-027 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALASKERNEL-5.4-2022-027.html
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