The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-5996 advisory.

    - vt: Disable KD_FONT_OP_COPY (Daniel Vetter)  [Orabug: 32187738]  {CVE-2020-28974}
    - Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts (Peilin Ye)  [Orabug: 32176254]     {CVE-2020-28915}
    - fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h (Peilin Ye)  [Orabug: 32176254]     {CVE-2020-28915}
    - xen/events: block rogue events for some time (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/events: defer eoi in case of excessive number of events (Juergen Gross)  [Orabug: 32177535]     {CVE-2020-27673}
    - xen/events: use a common cpu hotplug hook for event channels (Juergen Gross)  [Orabug: 32177535]     {CVE-2020-27673}
    - xen/events: switch user event channels to lateeoi model (Juergen Gross)  [Orabug: 32177535]     {CVE-2020-27673}
    - xen/pciback: use lateeoi irq binding (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/pvcallsback: use lateeoi irq binding (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/scsiback: use lateeoi irq binding (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/netback: use lateeoi irq binding (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/blkback: use lateeoi irq binding (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/events: add a new 'late EOI' evtchn framework (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/events: fix race in evtchn_fifo_unmask() (Juergen Gross)  [Orabug: 32177535]  {CVE-2020-27673}
    - xen/events: add a proper barrier to 2-level uevent unmasking (Juergen Gross)  [Orabug: 32177535]     {CVE-2020-27673}
    - perf/core: Fix a memory leak in perf_event_parse_addr_filter() (kiyin)  [Orabug: 32131172]     {CVE-2020-25704}
    - vt: keyboard, extend func_buf_lock to readers (Jiri Slaby)  [Orabug: 32122948]  {CVE-2020-25656}     {CVE-2020-25656}
    - vt: keyboard, simplify vt_kdgkbsent (Jiri Slaby)  [Orabug: 32122948]  {CVE-2020-25656}
    - tty: make FONTX ioctl use the tty pointer they were actually passed (Linus Torvalds)  [Orabug: 32122725]     {CVE-2020-25668}
    - Bluetooth: A2MP: Fix not initializing all members (Luiz Augusto von Dentz)  [Orabug: 32021285]     {CVE-2020-12352}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

Several vulnerabilities have been discovered in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service or information leaks.

CVE-2020-0427

Elena Petrova reported a bug in the pinctrl subsystem that can lead to a use-after-free after a device is renamed. The security impact of this is unclear.

CVE-2020-8694

Multiple researchers discovered that the powercap subsystem allowed all users to read CPU energy meters, by default. On systems using Intel CPUs, this provided a side channel that could leak sensitive information between user processes, or from the kernel to user processes. The energy meters are now readable only by root, by default.

This issue can be mitigated by running :

chmod go-r /sys/devices/virtual/powercap/*/*/energy_uj

This needs to be repeated each time the system is booted with an unfixed kernel version.

CVE-2020-14351

A race condition was discovered in the performance events subsystem, which could lead to a use-after-free. A local user permitted to access performance events could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

Debian's kernel configuration does not allow unprivileged users to access peformance events by default, which fully mitigates this issue.

CVE-2020-25645

A flaw was discovered in the interface driver for GENEVE encapsulated traffic when combined with IPsec. If IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel, tunneled data isn't correctly routed over the encrypted link and sent unencrypted instead.

CVE-2020-25656

Yuan Ming and Bodong Zhao discovered a race condition in the virtual terminal (vt) driver that could lead to a use-after-free. A local user with the CAP_SYS_TTY_CONFIG capability could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25668

Yuan Ming and Bodong Zhao discovered a race condition in the virtual terminal (vt) driver that could lead to a use-after-free. A local user with access to a virtual terminal, or with the CAP_SYS_TTY_CONFIG capability, could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25669

Bodong Zhao discovered a bug in the Sun keyboard driver (sunkbd) that could lead to a use-after-free. On a system using this driver, a local user could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25704

kiyin(&#x5C39;&#x4EAE;) discovered a potential memory leak in the performance events subsystem. A local user permitted to access performance events could use this to cause a denial of service (memory exhaustion).

Debian's kernel configuration does not allow unprivileged users to access peformance events by default, which fully mitigates this issue.

CVE-2020-25705

Keyu Man reported that strict rate-limiting of ICMP packet transmission provided a side-channel that could help networked attackers to carry out packet spoofing. In particular, this made it practical for off-path networked attackers to 'poison' DNS caches with spoofed responses ('SAD DNS' attack).

This issue has been mitigated by randomising whether packets are counted against the rate limit.

CVE-2020-27673 / XSA-332

Julien Grall from Arm discovered a bug in the Xen event handling code.
Where Linux was used in a Xen dom0, unprivileged (domU) guests could cause a denial of service (excessive CPU usage or hang) in dom0.

CVE-2020-27675 / XSA-331

Jinoh Kang of Theori discovered a race condition in the Xen event handling code. Where Linux was used in a Xen dom0, unprivileged (domU) guests could cause a denial of service (crash) in dom0.

CVE-2020-28974

Yuan Ming discovered a bug in the virtual terminal (vt) driver that could lead to an out-of-bounds read. A local user with access to a virtual terminal, or with the CAP_SYS_TTY_CONFIG capability, could possibly use this to obtain sensitive information from the kernel or to cause a denial of service (crash).

The specific ioctl operation affected by this bug (KD_FONT_OP_COPY) has been disabled, as it is not believed that any programs depended on it.

For Debian 9 stretch, these problems have been fixed in version 4.9.246-2.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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.

The SUSE Linux Enterprise 12 SP2 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed :

CVE-2021-3347: A use-after-free was discovered in the PI futexes during fault handling, allowing local users to execute code in the kernel (bnc#1181349).

CVE-2020-29569: Fixed a potential privilege escalation and information leaks related to the PV block backend, as used by Xen (bnc#1179509).

CVE-2020-29568: Fixed a denial of service issue, related to processing watch events (bnc#1179508).

CVE-2020-25211: Fixed a flaw where a local attacker was able to inject conntrack netlink configuration that could cause a denial of service or trigger the use of incorrect protocol numbers in ctnetlink_parse_tuple_filter (bnc#1176395).

CVE-2020-0444: Fixed a bad kfree due to a logic error in audit_data_to_entry (bnc#1180027).

CVE-2020-0465: Fixed multiple missing bounds checks in hid-multitouch.c that could have led to local privilege escalation (bnc#1180029).

CVE-2020-0466: Fixed a use-after-free due to a logic error in do_epoll_ctl and ep_loop_check_proc of eventpoll.c (bnc#1180031).

CVE-2020-15436: Fixed a use after free vulnerability in fs/block_dev.c which could have allowed local users to gain privileges or cause a denial of service (bsc#1179141).

CVE-2020-27068: Fixed an out-of-bounds read due to a missing bounds check in the nl80211_policy policy of nl80211.c (bnc#1180086).

CVE-2020-27777: Fixed a privilege escalation in the Run-Time Abstraction Services (RTAS) interface, affecting guests running on top of PowerVM or KVM hypervisors (bnc#1179107).

CVE-2020-27786: Fixed an out-of-bounds write in the MIDI implementation (bnc#1179601).

CVE-2020-27825: Fixed a race in the trace_open and buffer resize calls (bsc#1179960).

CVE-2020-29660: Fixed a locking inconsistency in the tty subsystem that may have allowed a read-after-free attack against TIOCGSID (bnc#1179745).

CVE-2020-29661: Fixed a locking issue in the tty subsystem that allowed a use-after-free attack against TIOCSPGRP (bsc#1179745).

CVE-2020-28974: Fixed a slab-out-of-bounds read in fbcon which could have been used by local attackers to read privileged information or potentially crash the kernel (bsc#1178589).

CVE-2020-28915: Fixed a buffer over-read in the fbcon code which could have been used by local attackers to read kernel memory (bsc#1178886).

CVE-2020-25669: Fixed a use-after-free read in sunkbd_reinit() (bsc#1178182).

CVE-2020-25285: A race condition between hugetlb sysctl handlers in mm/hugetlb.c could be used by local attackers to corrupt memory, cause a NULL pointer dereference, or possibly have unspecified other impact (bnc#1176485 ).

CVE-2020-15437: Fixed a NULL pointer dereference which could have allowed local users to cause a denial of service (bsc#1179140).

CVE-2020-36158: Fixed a potential remote code execution in the Marvell mwifiex driver (bsc#1180559).

CVE-2020-11668: Fixed the mishandling of invalid descriptors in the Xirlink camera USB driver (bnc#1168952).

CVE-2020-25668: Fixed a use-after-free in con_font_op() (bsc#1178123).

CVE-2020-27673: Fixed an issue where rogue guests could have caused denial of service of Dom0 via high frequency events (XSA-332 bsc#1177411)

CVE-2019-20934: Fixed a use-after-free in show_numa_stats() because NUMA fault statistics were inappropriately freed (bsc#1179663).

CVE-2019-19063: Fixed two memory leaks in the rtl_usb_probe() which could eventually have allowed attackers to cause a denial of service (memory consumption) (bnc#1157298 ).

CVE-2019-6133: Fixed an issue where the 'start time' protection mechanism could have been bypassed and therefore authorization decisions are improperly cached (bsc#1128172).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
144210	Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2020-5996)	Nessus	Oracle Linux Local Security Checks	12/14/2020	2/9/2026	high
144494	Debian DLA-2494-1 : linux security update	Nessus	Debian Local Security Checks	12/21/2020	1/31/2024	high
145005	Amazon Linux AMI : kernel (ALAS-2021-1461)	Nessus	Amazon Linux Local Security Checks	1/14/2021	1/26/2026	high
146476	SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0437-1)	Nessus	SuSE Local Security Checks	2/12/2021	2/9/2023	critical

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