QID 353131

Date Published: 2022-02-01

QID 353131: Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-020

A use-after-free flaw was found in kernel/trace/ring_buffer.c in linux kernel.
There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (dos).
This flaw could even allow a local attacker with special user privilege to a kernel information leak threat. (
( CVE-2020-27825) a flaw leak of the file handle for parent directory in the linux kernel's nfs3 functionality was found in the way user calls readdirplus.
A local user could use this flaw to traverse to other parts of the file-system than mounted sub-folder. (
( CVE-2021-3178) a flaw was found in the linux kernel.
A use-after-free memory flaw in the fast userspace mutexes functionality allowing a local user to crash the system or escalate their privileges on the system.
The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (
( CVE-2021-3347) a use after free flaw in the linux kernel network block device (nbd) subsystem was found in the way user calls an ioctl nbd_set_sock at a certain point during device setup. (
( CVE-2021-3348)



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 High - 7.2 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2KERNEL-5.4-2022-020 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353131

    CVE-2021-3178 | CVE-2021-3347 | CVE-2020-27825 | CVE-2021-3348 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2KERNEL-5.4-2022-020 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALASKERNEL-5.4-2022-020.html
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