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CVE-2019-15794

Status Candidate

Overview

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.

Related Files

Kernel Live Patch Security Notice LSN-0061-1
Posted Jan 8, 2020
Authored by Benjamin M. Romer

It was discovered that a heap-based buffer overflow existed in the Marvell WiFi-Ex Driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that a heap-based buffer overflow existed in the Marvell Libertas WLAN Driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux
advisories | CVE-2019-14895, CVE-2019-14896, CVE-2019-14897, CVE-2019-14901, CVE-2019-15794
MD5 | 2404d344042300ad2596b5f12fd94aaa
Ubuntu Security Notice USN-4208-1
Posted Dec 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4208-1 - Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux kernel did not properly handle reference counting during memory mapping operations when used in conjunction with AUFS. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did not properly validate SSID lengths. A physically proximate attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-15794, CVE-2019-17075, CVE-2019-17133, CVE-2019-18810, CVE-2019-19048, CVE-2019-19065, CVE-2019-19067, CVE-2019-19069, CVE-2019-19075, CVE-2019-19083
MD5 | f54701b90a79c629aed1748d3b7462c2
Ubuntu Security Notice USN-4209-1
Posted Dec 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4209-1 - Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux kernel did not properly handle reference counting during memory mapping operations when used in conjunction with AUFS. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a buffer overflow existed in the 802.11 Wi-Fi configuration interface for the Linux kernel when handling beacon settings. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-15794, CVE-2019-16746, CVE-2019-19076
MD5 | 1c2085746e123492f42ae3e8716e4219
Ubuntu ubuntu-aufs-modified mmap_region() Refcounting Issue
Posted Nov 12, 2019
Authored by Jann Horn, Google Security Research

Ubuntu suffers from an issue where ubuntu-aufs-modified mmap_region() breaks refcounting in overlayfs/shiftfs error path.

tags | exploit
systems | linux, ubuntu
advisories | CVE-2019-15794
MD5 | dbc5f5b20329ede3b61e960c453e1e6a
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