Linux 5.3 - Privilege Escalation via io_uring Offload of sendmsg() onto Kernel

Linux 5.3 - Privilege Escalation via iouring Offload of sendmsg onto Kernel Thread with Kernel Creds Since commit 0fa03c624d8f "iouring: add support for sendmsg", first in v5.3, iouring has support for asynchronously calling sendmsg. Unprivileged userspace tasks can submit IORINGOPSENDMSG...

Linux 5.3 - Privilege Escalation via io_uring Offload of sendmsg() onto Kernel Thread with Kernel Creds

Linux 5.3 - Privilege Escalation via iouring Offload of sendmsg onto Kernel Thread with Kernel Creds Since commit 0fa03c624d8f "iouring: add support for sendmsg", first in v5.3, iouring has support for asynchronously calling sendmsg. Unprivileged userspace tasks can submit IORINGOPSENDMSG...

Linux sendmsg() Privilege Escalation

Linux: privilege escalation via iouring offload of sendmsg onto kernel thread with kernel creds Since commit 0fa03c624d8f "iouring: add support for sendmsg", first in v5.3, iouring has support for asynchronously calling sendmsg. Unprivileged userspace tasks can submit IORINGOPSENDMSG submission...

Arbitrary Code Execution

Linux kernel is vulnerable to arbitrary code execution attacks. This issue is related to the handling of fork failure when dealing with event messages in the userfaultfd code. Failure to fork correctly could create a fork event that will be removed from an already freed list of events...

Linux - Missing Locking Between ELF coredump code and userfaultfd VMA Modification

Linux - Missing Locking Between ELF coredump code and userfaultfd VMA Modification elfcoredump has a comment back from something like 2.5.43-C3 that says: / We no longer stop all VM operations. This is because those proceses that could possibly change mapcount or the mmap / vma pages are now...

Linux Missing Lockdown Exploit

Linux suffers from a missing locking between ELF coredump code and userfaultfd VMA modification. Linux: missing locking between ELF coredump code and userfaultfd VMA modification Related CVE Numbers: CVE-2019-11599. elfcoredump has a comment back from something like 2.5.43-C3 that says: / We no...

Linux - Missing Locking Between ELF coredump code and userfaultfd VMA Modification

elfcoredump has a comment back from something like 2.5.43-C3 that says: / We no longer stop all VM operations. This is because those proceses that could possibly change mapcount or the mmap / vma pages are now blocked in doexit on current finishing this core dump. Only ptrace can touch these memo...

Race condition

The coredump implementation in the Linux kernel before 5.0.10 does not use locking or other mechanisms to prevent vma layout or vma flags changes while it runs, which allows local users to obtain sensitive information, cause a denial of service, or possibly have unspecified other impact by...

PT-2019-2821 · Linux +5 · Linux Kernel +5

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 5.0.10 Description: The issue is caused by errors in synchronization when using a shared resource in the Linux kernel's coredump implementation. This allows local users to obtain sensitive information, cause a...

Updated kernel-linus packages fix security vulnerabilities

This kernel-linus update is based on the upstream 4.14.100 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...

RHEL 7 : kernel (RHSA-2019:0324)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2019:0324 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: userfaultfd bypasses tmpfs file...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

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 update: Virtuozzo ReadyKernel patch 71.0 for Virtuozzo 7.0.6 to 7.0.8 HF1 and Virtuozzo Infrastructure Platform 2.5

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo kernels 3.10.0-693.1.1.vz7.37.30 Virtuozzo 7.0.6 to 3.10.0-862.11.6.vz7.64.7 Virtuozzo 7.0.8 HF1 and 3.10.0-862.20.2.vz7.73.24 Virtuozzo Infrastructure Platform 2.5...

OracleVM 3.4 : Unbreakable / etc (OVMSA-2019-0002)

The remote OracleVM system is missing necessary patches to address critical security updates : - rds: congestion updates can be missed when kernel low on memory Mukesh Kacker Orabug: 28425811 - net/rds: ib: Fix endless RNR Retries caused by memory allocation failures Venkat Venkatsubra Orabug:...

SUSE SLES12 Security Update : kernel (SUSE-SU-2019:0222-1) (Spectre)

The SUSE Linux Enterprise 12 SP4 kernel for Azure 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...

bpftool, kernel, perf, python security update

CentOS Errata and Security Advisory CESA-2019:0163 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...

Unbreakable Enterprise kernel security update

4.1.12-124.24.5 - rds: congestion updates can be missed when kernel low on memory Mukesh Kacker Orabug: 28425811 - net/rds: ib: Fix endless RNR Retries caused by memory allocation failures Venkat Venkatsubra Orabug: 28127993 - net: rds: fix excess initialization of the recv SGEs Zhu Yanjun Orabug...

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...