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Medium ALAS2-2021-1727 7 CVEs

Moderate: kernel security update (Amazon Linux 2)

Published Dec 8, 2021 · Updated Aug 14, 2024

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2021-47203: In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() CVE-2021-47189: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory ordering between normal and ordered work functions CVE-2021-47185: In the Linux kernel, the following vulnerability has been resolved: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc CVE-2021-47184: In the Linux kernel, the following vulnerability has been resolved: i40e: Fix NULL ptr dereference on VSI filter sync CVE-2021-4002: 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-2021-3772: 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-2021-3640: 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.

Fixed packages 14

ReleasePackageFixed in
Amazon Linux · 2 kernel 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-debuginfo 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-debuginfo-common-aarch64 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-debuginfo-common-x86_64 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-devel 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-headers 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-livepatch-4.14.256-197.484 0:1.0-0.amzn2
Amazon Linux · 2 kernel-tools 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-tools-debuginfo 0:4.14.256-197.484.amzn2
Amazon Linux · 2 kernel-tools-devel 0:4.14.256-197.484.amzn2
Amazon Linux · 2 perf 0:4.14.256-197.484.amzn2
Amazon Linux · 2 perf-debuginfo 0:4.14.256-197.484.amzn2
Amazon Linux · 2 python-perf 0:4.14.256-197.484.amzn2
Amazon Linux · 2 python-perf-debuginfo 0:4.14.256-197.484.amzn2

Vulnerabilities 7

  • High 8.8
    CVE-2021-47184

    i40e: Fix NULL ptr dereference on VSI filter sync

    In the Linux kernel, the following vulnerability has been resolved: i40e: Fix NULL ptr dereference on VSI filter sync Remove the reason of null pointer dereference in sync VSI filters. Added new I40E_VSI_RELEASING flag to signalize deleting and releasing of V…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.8
    CVE-2021-47203

    scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()

    In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass the requests to the adapter. If such an attempt fails, a l…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2021-47189

    btrfs: fix memory ordering between normal and ordered work functions

    In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory ordering between normal and ordered work functions Ordered work functions aren't guaranteed to be handled by the same thread which executed the normal work functions. The on…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Medium 4.4
    CVE-2021-47185

    tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc

    In the Linux kernel, the following vulnerability has been resolved: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc When running ltp testcase(ltp/testcases/kernel/pty/pty04.c) with arm64, there is a soft lockup, which look like this one: Workqueue…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Unscored —
    CVE-2021-3640

    A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls …

    linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  • Unscored —
    CVE-2021-3772

    A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through inv…

    linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  • Unscored —
    CVE-2021-4002

    A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memo…

    linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-3640.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-3772.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-4002.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-47184.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-47185.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-47189.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2021-47203.html