PT-2019-4696 · Linux+3 · Linux Kernel+3

Published 2019-06-21 · Updated 2025-09-29 · CVE-2019-19318

Positive Technologies (AI Summary)

CVSS v2.0

4.9

Medium

Base vector

AV:L/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel version 5.3.11

Description The issue is related to a use-after-free in the rwsem down write slowpath function, specifically in the rwsem can spin on owner function within kernel/locking/rwsem.c. This occurs when mounting a crafted btrfs image twice, causing rwsem owner flags to return an already freed pointer. The exploitation of this issue may allow an attacker to cause a denial of service.

Recommendations For Linux kernel version 5.3.11, consider applying a patch that fixes the use-after-free issue in the rwsem down write slowpath function as a permanent solution. As a temporary workaround, restrict the mounting of crafted btrfs images to minimize the risk of exploitation.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2025_12746

ALSA-2025_12752

ALSA-2025_12753

ALSA-2025_16880

ALT-PU-2019-2120

ALT-PU-2019-2311

ALT-PU-2019-3180

ALT-PU-2019-3268

BDU:2020-01077

CVE-2019-19318

DLA-2586-1

OPENSUSE-SU-2020:0336-1

OPENSUSE-SU-2020_0336-1

SUSE-SU-2020:0511-1

SUSE-SU-2020:0558-1

SUSE-SU-2020:0559-1

SUSE-SU-2020:0560-1

SUSE-SU-2020:0580-1

SUSE-SU-2020:0584-1

SUSE-SU-2020:0599-1

SUSE-SU-2020:0605-1

SUSE-SU-2020:0613-1

SUSE-SU-2020:1663-1

SUSE-SU-2020_1663-1

USN-4414-1

Affected Products

Alt Linux

Linux Kernel

Suse

Ubuntu

References · 548

• 🔥 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19318 · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2020:0580-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4414-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-19318 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:0511-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-19039 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-19318 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2020:0558-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-10711 · Vendor Advisory
• https://usn.ubuntu.com/4414-1 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-16089 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-01077 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2020:0599-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-12380 · Vendor Advisory