An issue was discovered in the Linux kernel through 4.17.10. There is a NULL pointer dereference and panic in hfsplus_lookup() in fs/hfsplus/dir.c when opening a file (that is purportedly a hard link) in an hfs+ filesystem that has malformed catalog data, and is mounted read-only without a metadata directory.
http://www.securityfocus.com/bid/104917
https://bugzilla.kernel.org/show_bug.cgi?id=200297
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://usn.ubuntu.com/3821-1/
https://usn.ubuntu.com/3821-2/
https://usn.ubuntu.com/4094-1/
https://usn.ubuntu.com/4118-1/
Source: MITRE
Published: 2018-07-27
Updated: 2019-08-13
Type: CWE-476
Base Score: 7.1
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C
Impact Score: 6.9
Exploitability Score: 8.6
Severity: HIGH
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1.8
Severity: MEDIUM