The version of kernel installed on the remote host is prior to 4.14.252-195.481. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1719 advisory.

    A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the     timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user     privileges to cause a denial of service, slowing and eventually stopping the system while running OSP. The     highest threat from this vulnerability is system availability. (CVE-2021-20317)

    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 use-after-free in the Linux kernel USB High Speed Mobile Devices functionality was found in the way     user detaches USB device. A local user could use this flaw to crash the system or escalate their     privileges on the system. (CVE-2021-37159)

    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. The highest threat     from this vulnerability is to system availability. (CVE-2021-3764)

    A flaw was found in the Linux kernel. The cBPF JIT compiler may produce machine code with incorrect     branches. This flaw allows an unprivileged user to craft anomalous machine code, where the control flow is     hijacked to execute arbitrary kernel code. The highest threat from this vulnerability is to     confidentiality, integrity, as well as system availability. (CVE-2021-38300)

    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)

    In the Linux kernel, the following vulnerability has been resolved:

    irqchip/gic-v3-its: Fix potential VPE leak on error (CVE-2021-47373)

    In the Linux kernel, the following vulnerability has been resolved:

    blktrace: Fix uaf in blk_trace access after removing by sysfs (CVE-2021-47375)

    In the Linux kernel, the following vulnerability has been resolved:

    tty: Fix out-of-bound vmalloc access in imageblit (CVE-2021-47383)

    In the Linux kernel, the following vulnerability has been resolved:

    cpufreq: schedutil: Use kobject release() method to free sugov_tunables (CVE-2021-47387)

    In the Linux kernel, the following vulnerability has been resolved:

    sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb (CVE-2021-47397)

    In the Linux kernel, the following vulnerability has been resolved:

    HID: betop: fix slab-out-of-bounds Write in betop_probe (CVE-2021-47404)

    In the Linux kernel, the following vulnerability has been resolved:

    HID: usbhid: free raw_report buffers in usbhid_stop (CVE-2021-47405)

    In the Linux kernel, the following vulnerability has been resolved:

    phy: mdio: fix memory leak (CVE-2021-47416)

    In the Linux kernel, the following vulnerability has been resolved:

    net_sched: fix NULL deref in fifo_set_limit() (CVE-2021-47418)

    In the Linux kernel, the following vulnerability has been resolved:

    i2c: acpi: fix resource leak in reconfiguration device addition (CVE-2021-47425)

    In the Linux kernel, the following vulnerability has been resolved:

    xhci: Fix command ring pointer corruption while aborting a command (CVE-2021-47434)

    In the Linux kernel, the following vulnerability has been resolved:

    nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells (CVE-2021-47497)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 5.4.156-83.273. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.4-2025-099 advisory.

    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. The highest threat     from this vulnerability is to system availability. (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)

    In the Linux kernel, the following vulnerability has been resolved:

    binder: make sure fd closes complete (CVE-2021-47360)

    In the Linux kernel, the following vulnerability has been resolved:

    irqchip/gic-v3-its: Fix potential VPE leak on error (CVE-2021-47373)

    In the Linux kernel, the following vulnerability has been resolved:

    blktrace: Fix uaf in blk_trace access after removing by sysfs (CVE-2021-47375)

    In the Linux kernel, the following vulnerability has been resolved:

    bpf: Add oversize check before call kvcalloc() (CVE-2021-47376)

    In the Linux kernel, the following vulnerability has been resolved:

    blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd (CVE-2021-47379)

    In the Linux kernel, the following vulnerability has been resolved:

    tty: Fix out-of-bound vmalloc access in imageblit (CVE-2021-47383)

    In the Linux kernel, the following vulnerability has been resolved:

    hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field (CVE-2021-47384)

    In the Linux kernel, the following vulnerability has been resolved:

    hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field (CVE-2021-47385)

    In the Linux kernel, the following vulnerability has been resolved:

    hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field (CVE-2021-47386)

    In the Linux kernel, the following vulnerability has been resolved:

    cpufreq: schedutil: Use kobject release() method to free sugov_tunables (CVE-2021-47387)

    In the Linux kernel, the following vulnerability has been resolved:

    sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb (CVE-2021-47397)

    In the Linux kernel, the following vulnerability has been resolved:

    net: sched: flower: protect fl_walk() with rcu (CVE-2021-47402)

    In the Linux kernel, the following vulnerability has been resolved:

    HID: betop: fix slab-out-of-bounds Write in betop_probe (CVE-2021-47404)

    In the Linux kernel, the following vulnerability has been resolved:

    HID: usbhid: free raw_report buffers in usbhid_stop (CVE-2021-47405)

    In the Linux kernel, the following vulnerability has been resolved:

    phy: mdio: fix memory leak (CVE-2021-47416)

    In the Linux kernel, the following vulnerability has been resolved:

    net_sched: fix NULL deref in fifo_set_limit() (CVE-2021-47418)

    In the Linux kernel, the following vulnerability has been resolved:

    i40e: Fix freeing of uninitialized misc IRQ vector (CVE-2021-47424)

    In the Linux kernel, the following vulnerability has been resolved:

    i2c: acpi: fix resource leak in reconfiguration device addition (CVE-2021-47425)

    In the Linux kernel, the following vulnerability has been resolved:

    xhci: Fix command ring pointer corruption while aborting a command (CVE-2021-47434)

    In the Linux kernel, the following vulnerability has been resolved:

    can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv (CVE-2021-47459)

    In the Linux kernel, the following vulnerability has been resolved:

    ocfs2: fix data corruption after conversion from inline format (CVE-2021-47460)

    In the Linux kernel, the following vulnerability has been resolved:

    audit: fix possible null-pointer dereference in audit_filter_rules (CVE-2021-47464)

    In the Linux kernel, the following vulnerability has been resolved:

    mm, slub: fix potential memoryleak in kmem_cache_open() (CVE-2021-47466)

    In the Linux kernel, the following vulnerability has been resolved:

    nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells (CVE-2021-47497)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
154914	Amazon Linux 2 : kernel (ALAS-2021-1719)	Nessus	Amazon Linux Local Security Checks	11/5/2021	5/22/2025	high
235794	Amazon Linux 2 : kernel (ALASKERNEL-5.4-2025-099)	Nessus	Amazon Linux Local Security Checks	5/13/2025	5/22/2025	high

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