Important: Red Hat Security Advisory: kernel security, bug fix, and enhancement update

An update for kernel is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from th...

kernel: userfaultfd bypasses tmpfs file permissions

A flaw was found in the Linux kernel with files on tmpfs and hugetlbfs. An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behavior. At this time there is an understanding there is no crash or privilege...

kernel security, bug fix, and enhancement update

3.10.0-957.5.1.OL7 - Oracle Linux certificates Alexey Petrenko - Oracle Linux RHCK Module Signing Key was compiled into kernel [email protected] - Update x509.genkey bug 24817676 3.10.0-957.5.1 - fs revert 'fs sunrpc: Ensure we always close the socket after a...

openSUSE Security Update : the Linux Kernel (openSUSE-2019-65)

The openSUSE Leap 15.0 kernel was updated to receive various security and bugfixes. The following security bugs were fixed : - CVE-2018-19407: The vcpuscanioapic function in arch/x86/kvm/x86.c allowed local users to cause a denial of service NULL pointer dereference and BUG via crafted system cal...

Security update for the Linux Kernel (important)

openSUSE Security Update: Security update for the Linux Kernel Announcement ID: openSUSE-SU-2019:0065-1 Rating: important References: 1024718 1046299 1050242 1050244 1051510 1055121 1055186 1058115 1060463 1065729 1078248 1079935 1082387 1083647 1086282 1086283 1086423 1087978 1088386 1090888...

Updated kernel packages fix security vulnerabilities

This kernel update is based on the upstream 4.14.89 and fixes at least the following security issues: Cross-hyperthread Spectre v2 mitigation is now provided by the Single Thread Indirect Branch Predictors STIBP support. Note that STIBP also requires the functionality be supported by the Intel...

Linux - userfaultfd Bypasses tmpfs File Permissions Exploit

Using the userfaultfd API, it is possible to first register a userfaultfd region for any VMA that fulfills vmacanuserfault: It must be an anonymous VMA -vmops==NULL, a hugetlb VMA VMHUGETLB, or a shmem VMA -vmops==shmemvmops. This means that it is, for example, possible to register userfaulfd...

Linux kernel userfaultfd tmpfs file permission bypass vulnerability

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 implementation of userfaultfd in versions of Linux kernel prior to 4.19.7, which stems from a program's failure to properly hand...

Linux - userfaultfd Bypasses tmpfs File Permissions

Linux - userfaultfd Bypasses tmpfs File Permissions Using the userfaultfd API, it is possible to first register a userfaultfd region for any VMA that fulfills vmacanuserfault: It must be an anonymous VMA -vmops==NULL, a hugetlb VMA VMHUGETLB, or a shmem VMA -vmops==shmemvmops. This means that it...

Linux - 'userfaultfd' Bypasses tmpfs File Permissions

Using the userfaultfd API, it is possible to first register a userfaultfd region for any VMA that fulfills vmacanuserfault: It must be an anonymous VMA -vmops==NULL, a hugetlb VMA VMHUGETLB, or a shmem VMA -vmops==shmemvmops. This means that it is, for example, possible to register userfaulfd...

Design/Logic Flaw

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

DEBIAN-CVE-2018-18397

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

CVE-2018-18397

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

CVE-2018-18397

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

CVE-2018-18397: Incorrect Authorization

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

UBUNTU-CVE-2018-18397

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles 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...

Linux userfaultfd tmpfs File Permission Bypass

Linux: userfaultfd bypasses tmpfs file permissions CVE-2018-18397 Using the userfaultfd API, it is possible to first register a userfaultfd region for any VMA that fulfills vmacanuserfault: It must be an anonymous VMA -vmops==NULL, a hugetlb VMA VMHUGETLB, or a shmem VMA -vmops==shmemvmops. This...

PT-2018-3360

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 4.19.7 Description: The issue exists due to insufficient input validation in the userfaultfd component of the Linux kernel. This could allow an attacker to impact the integrity of protected information. The...

Linux kernel Memory Leak Data Compromise

The vulnerability of the Linux operating system’s kernel fs/userfaultfd.c is related to the use of memory after it is freed. Exploiting this vulnerability allows a remote attacker to compromise the confidentiality, integrity, and accessibility of protected information through the use of the...

kernel: Use-after-free in userfaultfd_event_wait_completion function in userfaultfd.c

A flaw was found in the Linux kernel's handling of fork failure when dealing with event messages in the userfaultfd code. Failure to fork correctly can create a fork event that will be removed from an already freed list of events...