CVE-2026-58088 Race condition in ELF core dump segment counting
A race condition in FreeBSD's ELF core dump allows local attackers to trigger a kernel heap overflow, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58088?
CVE-2026-58088 is a high-severity vulnerability in Freebsd Freebsd, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding program headers, then iterated over the map a second time to populate them. A process sharing the address space via rfork(2) can mutate the map between the two passes, causing the second pass to write program headers past the end of the buffer.
An unprivileged local user sharing an address space with a process that dumps core can trigger an out-of-bounds write on the kernel heap, potentially leading to privilege escalation.
Which versions are affected by CVE-2026-58088?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-58088?
No fix has been published for CVE-2026-58088 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-58088 being exploited?
There is no known exploitation of CVE-2026-58088 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-7h55-5jqw-fvcq.