CVE-2019-15792: Type confusion in shiftfs
First published: Tue Nov 12 2019(Updated: )
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() calls fdget(oldfd), then without further checks passes the resulting file* into shiftfs_real_fdget(), which casts file->private_data, a void* that points to a filesystem-dependent type, to a "struct shiftfs_file_info *". As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | =5.0 | |
| Linux Linux kernel | =5.3 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =19.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=5df147c8140efc71ac0879ae3b0057f577226d4c
- https://usn.ubuntu.com/usn/usn-4183-1
- https://usn.ubuntu.com/usn/usn-4184-1
- https://launchpad.net/bugs/cve/CVE-2019-15792
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1850867
- https://security-tracker.debian.org/tracker/CVE-2019-15792
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15792
- https://nvd.nist.gov/vuln/detail/CVE-2019-15792
- https://ubuntu.com/security/CVE-2019-15792
Frequently Asked Questions
What is CVE-2019-15792?
CVE-2019-15792 is a vulnerability in the shiftfs module of the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series.
How does CVE-2019-15792 affect Ubuntu?
CVE-2019-15792 affects Ubuntu versions with the Linux kernel 5.0 and 5.3 series.
What is the severity of CVE-2019-15792?
The severity of CVE-2019-15792 is not specified.
How do I fix CVE-2019-15792?
To fix CVE-2019-15792, update your Ubuntu kernel to the fixed version provided by Ubuntu.
Where can I find more information about CVE-2019-15792?
You can find more information about CVE-2019-15792 on the Ubuntu security advisory for USN-4183-1 and USN-4184-1.
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