GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Patch | Gnu | * | 2.7.6 (including) |
| Patch | Ubuntu | bionic | * |
| Patch | Ubuntu | eoan | * |
| Patch | Ubuntu | focal | * |
| Patch | Ubuntu | groovy | * |
| Patch | Ubuntu | hirsute | * |
| Patch | Ubuntu | impish | * |
| Patch | Ubuntu | kinetic | * |
| Patch | Ubuntu | lunar | * |
| Patch | Ubuntu | mantic | * |
| Patch | Ubuntu | oracular | * |
| Patch | Ubuntu | plucky | * |
| Patch | Ubuntu | precise/esm | * |
| Patch | Ubuntu | trusty | * |
| Patch | Ubuntu | trusty/esm | * |
| Patch | Ubuntu | xenial | * |