There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14311
Reference (s):
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
- URL: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
- GENTOO:GLSA-202104-05
- URL: https://security.gentoo.org/glsa/202104-05
- MLIST:[oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros list