CVE-2020-29368

Affected software: Linux kernel up to version prior to 5.7.5 (pre-5.7.5). Vulnerability details: In mm/huge_memory.c, __split_huge_pmd, the copy-on-write CoW implementation can grant unintended write access due to a race in the THP mapcount check. This race condition can lead to local write acces...

CVE-2020-29374

An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/hugememory.c. The getuserpages aka gup implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka...

Linux kernel 竞争条件问题漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in versions of Linux kernel prior to 5.7.5, which stems from a contention condition in split huge pmd in mm huge memoryc, where the copy-on-writ...

Linux CoW Incorrect Access Grant Exploit

A Linux copy-on-write issue can wrongly grant write access. Linux: CoW can wrongly grant write access because of pinned references or THP bug I've stumbled over two ways in which copy-on-write of anonymous memory after fork is currently broken: Page references through the page refcount and a bug ...

PT-2020-1260 · Linux +7 · Linux Kernel +7

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 5.7.5 Description: The issue is related to the split huge pmd function in the mm/huge memory.c file of the Linux kernel. It involves a race condition in a THP mapcount check, which can grant unintended write...

Project Zero Discloses High-Severity Apple macOS Flaw

Researchers have disclosed what they say is a high-severity security flaw in Apple’s MacOS operating system – which has not yet been patched. The flaw gives an attacker privileges to perform malicious actions on a mounted filesystem – without the victim knowing. The Google Project Zero team...

Google Discloses Unpatched 'High-Severity' Flaw in Apple macOS Kernel

Cybersecurity researcher at Google's Project Zero division has publicly disclosed details and proof-of-concept exploit of a high-severity security vulnerability in macOS operating system after Apple failed to release a patch within 90 days of being notified. Discovered by Project Zero researcher...

Google Discloses Unpatched 'High-Severity' Flaw in Apple macOS Kernel

Cybersecurity researcher at Google's Project Zero division has publicly disclosed details and proof-of-concept exploit of a high-severity security vulnerability in macOS operating system after Apple failed to release a patch within 90 days of being notified. Discovered by Project Zero researcher...

macOS XNU - Copy-on-Write Behavior #Bypass via Mount of User-Owned Filesystem Image Exploit

XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected against later modifications by the source process; otherwise, the source process might be...

macOS XNU - Copy-on-Write Behavior Bypass via Mount of User-Owned Filesystem Image

macOS XNU - Copy-on-Write Behavior Bypass via Mount of User-Owned Filesystem Image XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected agains...

macOS XNU - Copy-on-Write Behavior Bypass via Mount of User-Owned Filesystem Image

XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected against later modifications by the source process; otherwise, the source process might be...

macOS XNU - Copy-on-Write Behaviour Bypass via Partial-Page Truncation of File Exploit

/ XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected against later modifications by the source process; otherwise, the source process might ...

macOS XNU - Copy-on-Write Behaviour Bypass via Partial-Page Truncation of File

macOS XNU - Copy-on-Write Behaviour Bypass via Partial-Page Truncation of File / XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected against...

macOS XNU - Copy-on-Write Behaviour Bypass via Partial-Page Truncation of File

/ XNU has various interfaces that permit creating copy-on-write copies of data between processes, including out-of-line message descriptors in mach messages. It is important that the copied memory is protected against later modifications by the source process; otherwise, the source process might ...

Security Bulletin: IBM Security Guardium is affected by Linux kernel privesc: Dirty COW vulnerability (CVE-2016-5195)

Summary Linux Kernel could allow a local attacker to gain elevated privileges on the system, caused by a race condition when handling the copy-on-write COW breakage of private read-only memory mappings by the memory subsystem. IBM Security Guardium has provided a fix for this vulnerability...

kernel: pmd can become dirty without going through a COW cycle

A flaw was found in the patches used to fix the 'dirtycow' vulnerability CVE-2016-5195. An attacker, able to run local code, can exploit a race condition in transparent huge pages to modify usually read-only huge pages...

Ubuntu 16.04 LTS : Linux kernel regression (USN-3509-3)

The remote Ubuntu 16.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-3509-3 advisory. USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesyst...

USN-3509-3: Linux kernel regression

USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesystem from being used. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Mohamed Ghannam...

Ubuntu: Security Advisory (USN-3507-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2017 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...

USN-3507-2 linux-gcp vulnerabilities

Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem XFRM in the Linux kernel. A local attacker could use this to cause a denial of service system crash or possibly execute arbitrary code. CVE-2017-16939 It was discovered that the Linux kernel did not...