CVE-2019-19448 Use after free in n/a

What is CVE-2019-19448?

CVE-2019-19448 is a high-severity use after free vulnerability in Canonical Ubuntu Linux, published on 8 Dec 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

In the Linux kernel 5.0.21 and 5.3.11, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

Weakness: CWE-416

Which versions are affected by CVE-2019-19448?

It affects 18 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Netapp A700s Firmware, Netapp Active Iq Unified Manager, Netapp Aff 8300 Firmware and 12 more.

How do I fix CVE-2019-19448?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2019-19448 being exploited?

There is no known exploitation of CVE-2019-19448 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-19448, GHSA-55vw-8vf8-x898, UBUNTU-CVE-2019-19448.