libslirp 4.0.0, as used in QEMU 4.1.0, has a use-after-free in ip_reass in ip_input.c.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://gitlab.freedesktop.org/slirp/libslirp/commit/c5927943 | third party advisory patch |
| http://www.openwall.com/lists/oss-security/2019/09/06/3 | patch mailing list third party advisory |
| https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html | mailing list |
| https://usn.ubuntu.com/4191-2/ | vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html | vendor advisory |
| https://usn.ubuntu.com/4191-1/ | vendor advisory |
| https://seclists.org/bugtraq/2020/Feb/0 | mailing list |
| https://www.debian.org/security/2020/dsa-4616 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2020:0775 | vendor advisory |