The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4749-1 advisory.

    Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A     local attacker could use this to cause a denial of service or possibly execute arbitrary code.
    (CVE-2020-25669)

    It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds     read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
    (CVE-2020-27815)

    Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in the Linux kernel did not     correctly handle setting line discipline in some situations. A local attacker could use this to cause a     denial of service (system crash). (CVE-2020-27830, CVE-2020-28941)

    It was discovered that the memory management subsystem in the Linux kernel did not properly handle copy-     on-write operations in some situations. A local attacker could possibly use this to gain unintended write     access to read-only memory pages. (CVE-2020-29374)

    Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux     kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29568)

    Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in     the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29569)

    Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some     situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial     of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

    Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the     TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

The SUSE Linux Enterprise 15 SP2 RT kernel was updated to receive various security and bugfixes.

The following security bugs were fixed :

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

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

CVE-2020-25705: Fixed A flaw in the way reply ICMP packets are limited in was found that allowed to quickly scan open UDP ports. This flaw allowed an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software and services that rely on UDP source port randomization (like DNS) are indirectly affected as well. Kernel versions may be vulnerable to this issue (bsc#1175721, bsc#1178782).

CVE-2020-27777: Restrict RTAS requests from userspace (bsc#1179107)

CVE-2020-27786: Fixed a use after free in kernel midi subsystem snd_rawmidi_kernel_read1() (bsc#1179601).

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-2020-28941: Fixed an issue where local attackers on systems with the speakup driver could cause a local denial of service attack (bsc#1178740).

CVE-2020-29369: Fixed a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe (bnc#1173504 bsc#1179432).

CVE-2020-29371: Fixed uninitialized memory leaks to userspace (bsc#1179429).

CVE-2020-4788: Fixed an issue with IBM Power9 processors could have allowed a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances (bsc#1177666).

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	名称	产品	系列	发布时间	最近更新时间	严重程度
147983	Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4749-1)	Nessus	Ubuntu Local Security Checks	2021/3/23	2024/8/27	high
247764	Linux Distros Unpatched Vulnerability : CVE-2020-28941	Nessus	Misc.	2025/8/10	2026/7/17	medium
144143	SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3764-1)	Nessus	SuSE Local Security Checks	2020/12/14	2024/2/2	high

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