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CVE-2020-10690

Status Candidate

Overview

There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.

Related Files

Ubuntu Security Notice USN-4419-1
Posted Jul 8, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4419-1 - It was discovered that a race condition existed in the Precision Time Protocol implementation in the Linux kernel, leading to a use-after- free vulnerability. A local attacker could possibly use this to cause a denial of service or possibly execute arbitrary code. Matthew Sheets discovered that the SELinux network label handling implementation in the Linux kernel could be coerced into de-referencing a NULL pointer. A remote attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2020-10690, CVE-2020-10711, CVE-2020-12770, CVE-2020-13143, CVE-2020-8992
MD5 | 1a43296b82c72fbb0f52cc4e8828d2f4
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