CVE-2019-19448: Use After Free
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 trymergefreespace 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.180-1Fixed in 6.12.94-1Fixed in 6.12.107-1Fixed in 7.1.8-2Fixed in 7.1.12-1
Event History
Frequently Asked Questions
What is the severity of CVE-2019-19448?
CVE-2019-19448 has a moderate severity level due to the potential for data corruption and denial of service.
How do I fix CVE-2019-19448?
To fix CVE-2019-19448, upgrade your Linux kernel to versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
What versions of Linux kernel are affected by CVE-2019-19448?
CVE-2019-19448 affects Linux kernel versions 5.0.21 to 5.3.11 and several earlier versions up to 4.19.x.
Is CVE-2019-19448 a local or remote vulnerability?
CVE-2019-19448 is a local vulnerability that requires an attacker to have access to a system where the vulnerable kernel is running.
What type of vulnerability is CVE-2019-19448?
CVE-2019-19448 is a use-after-free vulnerability in the Linux kernel related to the btrfs filesystem.