QID 353079

Date Published: 2021-12-10

QID 353079: Amazon Linux Security Advisory for kernel : ALAS2-2021-1727

A flaw use-after-free in function sco_sock_sendmsg() of the linux kernel hci subsystem was found in the way user calls ioct uffdio_register or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page.
A privileged local user could use this flaw to crash the system or escalate their privileges on the system. (
( CVE-2021-3640) a flaw was found in the linux sctp stack.
A blind attacker may be able to kill an existing sctp association through invalid chunks if the attacker knows the ip-addresses and port numbers being used and the attacker can send packets with spoofed ip addresses. (
( CVE-2021-3772) a memory leak flaw in the linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to pud alignment with the fault of some of the memory pages.
A local user could use this flaw to get unauthorized access to some data. (
( CVE-2021-4002)



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 - 4.2 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1727 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353079

    CVE-2021-3772 | CVE-2021-4002 | CVE-2021-3640 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1727 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1727.html
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