It was discovered that a race condition existed in the vsock address family implementation of the Linux kernel that could lead to a use-after-free condition. A local attacker in a guest virtual machine could use this to expose sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM implementation of the Linux kernel, when handling interrupts in environments where nested virtualization is in use (nested KVM virtualization is not enabled by default in Ubuntu kernels). A local attacker in a guest VM could possibly use this to gain administrative privileges in a host machine. (CVE-2018-16882)

Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics were initialized. A local attacker could use this to cause a denial of service (system crash).
(CVE-2018-19407)

It was discovered that the crypto subsystem of the Linux kernel leaked uninitialized memory to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-19854).

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

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-5676 advisory.

    - KVM: x86: Protect ioapic_read_indirect() from Spectre-v1/L1TF attacks (Marios Pomonis)  [Orabug:
    31191092]  {CVE-2013-1798}
    - HID: hiddev: do cleanup in failure of opening a device (Hillf Danton)  [Orabug: 31206359]     {CVE-2019-19527}
    - HID: hiddev: avoid opening a disconnected device (Hillf Danton)  [Orabug: 31206359]  {CVE-2019-19527}
    - include/linux/relay.h: fix percpu annotation in struct rchan (Luc Van Oostenryck)  [Orabug: 31183399]     {CVE-2019-19462}
    - HID: Fix assumption that devices have inputs (Alan Stern)  [Orabug: 30622561]  {CVE-2019-19532}
    - vgacon: Fix a UAF in vgacon_invert_region (Zhang Xiaoxu)  [Orabug: 31143946]  {CVE-2020-8649}     {CVE-2020-8647} {CVE-2020-8647} {CVE-2020-8649} {CVE-2020-8647} {CVE-2020-8649}
    - blktrace: Protect q->blk_trace with RCU (Jan Kara)  [Orabug: 31123575]  {CVE-2019-19768}
    - blktrace: fix unlocked access to init/start-stop/teardown (Jens Axboe)  [Orabug: 31123575]     {CVE-2019-19768}
    - vt: selection, push sel_lock up (Jiri Slaby)  [Orabug: 30923296]  {CVE-2020-8648}
    - vt: selection, push console lock down (Jiri Slaby)  [Orabug: 30923296]  {CVE-2020-8648}
    - vt: selection, close sel_buffer race (Jiri Slaby)  [Orabug: 30923296]  {CVE-2020-8648} {CVE-2020-8648}
    - slcan: Don't transmit uninitialized stack data in padding (Richard Palethorpe)  [Orabug: 31136752]     {CVE-2020-11494}
    - crypto: user - fix leaking uninitialized memory to userspace (Eric Biggers)  [Orabug: 31081816]     {CVE-2018-19854}
    - scsi: libsas: stop discovering if oob mode is disconnected (Jason Yan)  [Orabug: 30770911]     {CVE-2019-19965}
    - dccp: Fix memleak in __feat_register_sp (YueHaibing)  [Orabug: 30755059]  {CVE-2019-20096}
    - mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings (Wen Huang)  [Orabug:
    31104480]  {CVE-2019-14814} {CVE-2019-14815} {CVE-2019-14816} {CVE-2019-14814} {CVE-2019-14815}     {CVE-2019-14816}
    - floppy: check FDC index for errors before assigning it (Linus Torvalds)  [Orabug: 31067513]     {CVE-2020-9383}

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.

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

This update brings following features :

Support for Enhanced-IBRS on new Intel CPUs (fate#326564)

The following security bugs were fixed: CVE-2018-9568: In sk_clone_lock of sock.c, there is a possible memory corruption due to type confusion. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. (bnc#1118319).

CVE-2018-12232: In net/socket.c there is a race condition between fchownat and close in cases where they target the same socket file descriptor, related to the sock_close and sockfs_setattr functions.
fchownat did not increment the file descriptor reference count, which allowed close to set the socket to NULL during fchownat's execution, leading to a NULL pointer dereference and system crash (bnc#1097593).

CVE-2018-14625: A flaw was found where an attacker may be able to have an uncontrolled read to kernel-memory from within a vm guest. A race condition between connect() and close() function may allow an attacker using the AF_VSOCK protocol to gather a 4 byte information leak or possibly intercept or corrupt AF_VSOCK messages destined to other clients (bnc#1106615).

CVE-2018-16862: A security flaw was found in the way that the cleancache subsystem clears an inode after the final file truncation (removal). The new file created with the same inode may contain leftover pages from cleancache and the old file data instead of the new one (bnc#1117186).

CVE-2018-16884: NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out (bnc#1119946).

CVE-2018-18281: The mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. (bnc#1113769).

CVE-2018-18397: The userfaultfd implementation mishandled access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c (bnc#1117656).

CVE-2018-18710: An information leak in cdrom_ioctl_select_disc in drivers/cdrom/cdrom.c could be used by local attackers to read kernel memory because a cast from unsigned long to int interferes with bounds checking. This is similar to CVE-2018-10940 and CVE-2018-16658 (bnc#1113751).

CVE-2018-19407: The vcpu_scan_ioapic function in arch/x86/kvm/x86.c allowed local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where ioapic is uninitialized (bnc#1116841).

CVE-2018-19824: A local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c (bnc#1118152).

CVE-2018-19854: An issue was discovered in the crypto_report_one() and related functions in crypto/crypto_user.c (the crypto user configuration API) do not fully initialize structures that are copied to userspace, potentially leaking sensitive memory to user programs.
NOTE: this is a CVE-2013-2547 regression but with easier exploitability because the attacker did not need a capability (however, the system must have the CONFIG_CRYPTO_USER kconfig option) (bnc#1118428).

CVE-2018-19985: The function hso_probe read if_num from the USB device (as an u8) and used it without a length check to index an array, resulting in an OOB memory read in hso_probe or hso_get_config_data that could be used by local attackers (bnc#1120743).

CVE-2018-20169: The USB subsystem mishandled size checks during the reading of an extra descriptor, related to __usb_get_extra_descriptor in drivers/usb/core/usb.c (bnc#1119714).

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
121595	Ubuntu 18.10 : linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities (USN-3878-1)	Nessus	Ubuntu Local Security Checks	2019/2/5	2024/6/24	high
136485	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2020-5676)	Nessus	Oracle Linux Local Security Checks	2020/5/12	2024/11/1	high
121571	SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2019:0224-1)	Nessus	SuSE Local Security Checks	2019/2/4	2022/5/24	high

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