container-tools:rhel8 bug fix update

The container-tools module contains tools for working with containers, notably podman, buildah, skopeo, and runc. Bug Fixes: podman exec rc-code needs to distinguish between stopped containers and non existing ones BZ1723470 Performance Problems with Podman on systems with IO load BZ1724522 podma...

Authorization Bypass

Linux kernel is vulnerable to authorization bypass attacks. This exists in the tmpfs and hugetlbfs files. An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behavior...

Privilege Escalation

Linux kernel is vulnerable to privilege escalation. This occurs in 'tmpfs' file system, the set group id setgid bit is not properly cleared during a setxattr call. A local user can exploit this to change permissions on a file and gain elevated privileges on the target system which allows an...

RHEL 7 : kernel-alt (RHSA-2019:0831)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0831 advisory. The kernel-alt packages provide the Linux kernel version 4.x. Security Fixes: kernel: lack of check for mmap minimum address in...

EulerOS 2.0 SP5 : kernel (EulerOS-SA-2019-1076)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A security flaw was found in the ipfragreasm function in net/ipv4/ipfragment.c in the Linux kernel which can cause a later system crash in...

Oracle Linux 7 : kernel (ELSA-2019-0163)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-0163 advisory. - fs userfaultfd: check VMMAYWRITE was set after verifying the uffd is registered Andrea Arcangeli 1640518 1640519 CVE-2018-18397 - mm userfaultfd: all...

RHEL 7 : kernel (RHSA-2019:0202)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2019:0202 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: userfaultfd bypasses tmpfs file...

RHEL 7 : kernel (RHSA-2019:0163)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0163 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: Use-after-free due to race...

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 - 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 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

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...

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...

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 vulnerability CVE-2018-18397 affects the Linux kernel prior to 4.19.7, where the userfaultfd implementation mishandles access control for certain UFFDIO ioctls (fs/userfaultfd.c and mm/userfaultfd.c). A local attacker with read permissions on a tmpfs file containing holes could write data int...

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...

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...