The version of kernel installed on the remote host is prior to 4.14.209-117.337. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1461 advisory.

    A use-after-free flaw was found in the debugfs_remove function in the Linux kernel. The flaw could allow a     local attacker with special user (or root) privilege to crash the system at the time of file or directory     removal. This vulnerability can lead to a kernel information leak. The highest threat from this     vulnerability is to system availability. (CVE-2019-19770)

    A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem     allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate     privileges.  The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2020-14351)

    A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was     using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of     bounds. The highest threat from this vulnerability is to data confidentiality. (CVE-2020-25656)

    A flaw was found in Linux Kernel because access to the global variable fg_console is not properly     synchronized leading to a use after free in con_font_op. (CVE-2020-25668)

    The function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed.Though the     dangling pointer is set to NULL in sunkbd_disconnect, there is still a alias in sunkbd_reinit so that     causing Use After Free. (CVE-2020-25669)

    A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using     PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of     service. (CVE-2020-25704)

    An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.
    (CVE-2020-27673)

    An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5. (CVE-2020-27675)

    A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked     down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to further increase their privileges to that of a     running kernel. (CVE-2020-27777)

    An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

    An out-of-bounds (OOB) SLAB memory access flaw was found in the Linux kernel's fbcon driver module. A     bounds check failure allows a local attacker with special user privileges to gain access to out-of-bounds     memory, leading to a system crash or leaking of internal kernel information. The highest threat from this     vulnerability is to system availability. (CVE-2020-28974)

    A flaw was found in the Linux kernel's implementation of Intel's Running Average Power Limit (RAPL)     implementation. A local attacker could infer secrets by measuring power usage and also infer private data     by observing the power usage of calculations performed on the data. (CVE-2020-8694)

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.

Detections

Analytics

Amazon Linux AMI : kernel (ALAS-2021-1461)

high Nessus Plugin ID 145005

Version 1.7

Version 1.6

Version 1.7 Dec 11, 2024, 10:15 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202412112215
Version 1.6 Jan 30, 2024, 3:19 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C". "CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") Exploit attributes ("Exploit available" set to "True". "Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202401301519