The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.
The product calls free() twice on the same memory address.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Glibc | Gnu | 2.29 (including) | 2.33 (including) |
| Red Hat Enterprise Linux 8 | RedHat | glibc-0:2.28-164.el8 | * |
| Red Hat Enterprise Linux 8 | RedHat | glibc-0:2.28-164.el8 | * |
| Eglibc | Ubuntu | trusty | * |
| Glibc | Ubuntu | esm-infra/focal | * |
| Glibc | Ubuntu | focal | * |
| Glibc | Ubuntu | groovy | * |
| Glibc | Ubuntu | trusty | * |
| Glibc | Ubuntu | xenial | * |