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.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4752-1 advisory.

  - Legacy pairing and secure-connections pairing authentication in Bluetooth BR/EDR Core Specification v5.2     and earlier may allow an unauthenticated user to complete authentication without pairing credentials via     adjacent access. An unauthenticated, adjacent attacker could impersonate a Bluetooth BR/EDR master or     slave to pair with a previously paired remote device to successfully complete the authentication procedure     without knowing the link key. (CVE-2020-10135)

  - A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file     system, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash     the system if the directory exists. The highest threat from this vulnerability is to system availability.
    (CVE-2020-14314)

  - Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain     privileges or cause a denial of service by leveraging improper access to a certain error field.
    (CVE-2020-15436)

  - The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in     drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports() that allows local users to cause a denial     of service by using the p->serial_in pointer which uninitialized. (CVE-2020-15437)

  - Improper buffer restrictions in BlueZ may allow an unauthenticated user to potentially enable denial of     service via adjacent access. This affects all Linux kernel versions that support BlueZ. (CVE-2020-24490)

  - A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers     to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c     instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452. (CVE-2020-25212)

  - The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete     permission checking for access to rbd devices, which could be leveraged by local attackers to map or unmap     rbd block devices, aka CID-f44d04e696fe. (CVE-2020-25284)

  - A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length     biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a     denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block     device, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-25641)

  - A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption     and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause     the system to crash or cause a denial of service. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25643)

  - 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 ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before     5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering,     aka CID-77377064c3a9. (CVE-2020-27152)

  - A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the     ability to set extended attributes to panic the system, causing memory corruption or escalating     privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system     availability. (CVE-2020-27815)

  - An information disclosure vulnerability exists in the /proc/pid/syscall functionality of Linux Kernel 5.1     Stable and 5.4.66. More specifically, this issue has been introduced in v5.1-rc4 (commit     631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0) and is still present in v5.10-rc4, so it's likely that all     versions in between are affected. An attacker can read /proc/pid/syscall to trigger this vulnerability,     which leads to the kernel leaking memory contents. (CVE-2020-28588)

  - A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be     used by local attackers to read kernel memory, aka CID-6735b4632def. (CVE-2020-28915)

  - An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The     copy-on-write implementation can grant unintended write access because of a race condition in a THP     mapcount check, aka CID-c444eb564fb1. (CVE-2020-29368)

  - An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between     certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an     munmap call, aka CID-246c320a8cfe. (CVE-2020-29369)

  - An issue was discovered in romfs_dev_read in fs/romfs/storage.c in the Linux kernel before 5.8.4.
    Uninitialized memory leaks to userspace, aka CID-bcf85fcedfdd. (CVE-2020-29371)

  - A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID,     aka CID-c8bcd9c5be24. (CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
    (CVE-2020-29661)

  - A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux     kernel child/parent process identification handling while filtering signal handlers. A local attacker is     able to abuse this flaw to bypass checks to send any signal to a privileged process. (CVE-2020-35508)

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 15 SP2 kernel was updated to 3.12.31 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-2020-25668: Fixed a concurrency use-after-free in con_font_op (bsc#1178123).

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

CVE-2020-25704: Fixed a leak in perf_event_parse_addr_filter() (bsc#1178393).

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

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-2020-28974: 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-2020-29371: Fixed uninitialized memory leaks to userspace (bsc#1179429).

CVE-2020-25705: Fixed an issue which could have allowed to quickly scan open UDP ports. This flaw allowed an off-path remote user to effectively bypassing source port UDP randomization (bsc#1175721).

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-2020-4788: 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).

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 1179432).

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.

This update syncs the RT kernel from the SUSE Linux Enterprise 15-SP2 codestream. This update was imported from the SUSE:SLE-15-SP2:Update update project.

ID	Name	Product	Family	Published	Updated	Severity
144143	SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3764-1)	Nessus	SuSE Local Security Checks	12/14/2020	2/2/2024	high
144313	openSUSE Security Update : the Linux Kernel (openSUSE-2020-2260)	Nessus	SuSE Local Security Checks	12/16/2020	2/1/2024	high
147982	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4752-1)	Nessus	Ubuntu Local Security Checks	3/23/2021	1/9/2024	high
144101	SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2020:3748-1)	Nessus	SuSE Local Security Checks	12/11/2020	2/2/2024	high
143523	openSUSE Security Update : the Linux Kernel (openSUSE-2020-2161)	Nessus	SuSE Local Security Checks	12/7/2020	2/6/2024	high
146282	openSUSE Security Update : RT kernel (openSUSE-2021-242)	Nessus	SuSE Local Security Checks	2/8/2021	2/9/2023	critical

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