ALAS-2021-1539


Amazon Linux AMI Security Advisory: ALAS-2021-1539
Advisory Release Date: 2021-09-30 19:25 Pacific
Advisory Updated Date: 2021-10-04 22:14 Pacific
Severity: Important

Issue Overview:

A flaw was found in the Linux kernel. When reusing a socket with an attached dccps_hc_tx_ccid as a listener, the socket will be used after being released leading to denial of service (DoS) or a potential code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-16119)

A flaw was found in the Linux kernel's KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability. (CVE-2021-22543)

A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. (CVE-2021-3609)

A vulnerability was found in the Linux kernel. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory. (CVE-2021-3655)

A lack of CPU resources in the Linux kernel tracing module functionality was found in the way users use the trace ring buffer in specific way. Only privileged local users (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service. (CVE-2021-3679)

A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible. (CVE-2021-3732)

A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl (KDSETMDE). The highest threat from this vulnerability is to data confidentiality. (CVE-2021-3753)

A flaw was found on the Linux kernel. On the PowerPC platform, the KVM guest allows the OS users to cause host OS memory corruption via rtas_args.nargs. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-37576)

A flaw was found in the Linux kernel, where it incorrectly computes the access permissions of a shadow page. This issue leads to a missing guest protection page fault. (CVE-2021-38198)

A flaw was found in the Linux kernel. A denial of service attack (use-after-free and panic) can be caused by a physically proximate attack by removing a MAX-3421 USB device in certain situations. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-38204)

A flaw was found in the Linux kernel that allows attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer). The highest threat from this vulnerability is to confidentiality. (CVE-2021-38205)

A flaw was found in the Linux kernel. A race condition was discovered in the ext4 subsystem. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-40490)


Affected Packages:

kernel


Issue Correction:
Run yum update kernel to update your system.

New Packages:
i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64