Linux kernel denial of service vulnerability (CNVD-2020-52622)

Linux kernel is the kernel used by Linux, the open source operating system released by the Linux Foundation in the United States. A security vulnerability exists in the 'vfsubdentryopen' function in the Linux kernel. The vulnerability stems from an implementation of aufs that does not properly...

DEBIAN-CVE-2019-20811

An issue was discovered in the Linux kernel before 5.0.6. In rxqueueaddkobject and netdevqueueaddkobject in net/core/net-sysfs.c, a reference count is mishandled, aka CID-a3e23f719f5c...

Fedora: Security Advisory for json-c (FEDORA-2020-847ad856ab)

The remote host is missing an update for the Copyright C 2020 Greenbone Networks GmbH Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-or-later This program is free software; you can...

CVE-2019-15794 Reference counting error in overlayfs/shiftfs error path when used in conjuction with aufs

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma-vmfile in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vmfile points. On...

systemd-machined Incorrect Reference Decrement

systemd: systemd-machined decrements reference count when references still held I've been looking at the version of systemd shipped in Fedora 31 approximately ef677436aa203c24816021dd698b57f219f0ff64 I noticed that systemd-machined caches image objects, and uses reference counting to keep track o...

Huawei EulerOS: Security Advisory for dhcp (EulerOS-SA-2019-1443)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()

A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor implements its device control API. While creating a device via kvmioctlcreatedevice, the device holds a reference to a VM object, later this reference is transferred to the caller's file descriptor table. If suc...

USN-4204-1 python-psutil vulnerability

Riccardo Schirone discovered that psutil incorrectly handled certain reference counting operations. An attacker could use this issue to cause psutil to crash, resulting in a denial of service, or possibly execute arbitrary code...

Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs

Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this i...

Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs Exploit

Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this is attack surface from unprivileged userspace in the default...

Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs

Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this is attack surface from unprivileged userspace in the default...

Debian DLA-1998-1 : python-psutil security update

It was discovered that there were multiple double free vulnerabilities in python-psutil, a Python module providing convenience functions for accessing system process data. This was caused by incorrect reference counting handling within for/while loops that convert system data into said Python...

Ubuntu shiftfs refcount Underflow / Type Confusion

Ubuntu: refcount underflow and type confusion in shiftfs Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this is...

CVE-2018-5733

A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic...

NewStart CGSL MAIN 5.04 : dhcp Multiple Vulnerabilities (NS-SA-2019-0010)

The remote NewStart CGSL host, running version MAIN 5.04, has dhcp packages installed that are affected by multiple vulnerabilities: - An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to cras...

kernel: l2tp: Race condition between pppol2tp_session_create() and l2tp_eth_create()

A race condition between pppol2tpsessioncreate and l2tpethcreate in net/l2tp/l2tpnetlink.c was found in the Linux kernel. Calling l2tptunnelfind may result in a new tunnel being created with tunnel id of a previously removed tunnel which wouldn't be protected by the reference counter...

Ubuntu 19.04 : Linux kernel vulnerabilities (USN-4069-1)

It was discovered that an integer overflow existed in the Linux kernel when reference counting pages, leading to potential use-after-free issues. A local attacker could use this to cause a denial of service system crash or possibly execute arbitrary code. CVE-2019-11487 Jann Horn discovered that ...

EulerOS Virtualization 3.0.1.0 : dhcp (EulerOS-SA-2019-1443)

According to the versions of the dhcp packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : - ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service applicati...

Oracle Linux 7 : kernel (ELSA-2019-0818)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-0818 advisory. - kvm kvm: fix kvmioctlcreatedevice reference counting Paolo Bonzini 1671922 1671923 CVE-2019-6974 - kvm KVM: nVMX: unconditionally cancel preemption...

PT-2022-4312

Name of the Vulnerable Software and Affected Versions systemd affected versions not specified Description A use-after-free issue was found in systemd due to the on stream io function and dns stream complete function in 'resolved-dns-stream.c' not incrementing the reference counting for the...