An issue was discovered in fs/gfs2/rgrp.c in the Linux kernel before 4.8. A use-after-free is caused by the functions gfs2_clear_rgrpd and read_rindex_entry.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=36e4ad0316c017d5b271378ed9a1c9a4b77fab5f | patch vendor advisory |
| https://lists.debian.org/debian-lts-announce/2019/09/msg00025.html | mailing list vendor advisory |
| https://usn.ubuntu.com/4145-1/ | vdb entry vendor advisory |
| https://support.f5.com/csp/article/K31332013 | vdb entry third party advisory |
| https://support.f5.com/csp/article/K31332013?utm_source=f5support&%3Butm_medium=RSS | |
| http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html | vdb entry third party advisory |
| https://seclists.org/bugtraq/2019/Nov/11 | third party advisory mailing list |
| http://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html | vdb entry third party advisory |