CVE-2026-104115 Stack buffer overflow in illumos reparsed nfs-basic plugin allows local users to crash the daemon
A local attacker can crash the illumos reparse daemon by sending an overlong NFS reparse string, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104115?
CVE-2026-104115 is a medium-severity memory corruption vulnerability in OmniOS, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack-based buffer overflow in the illumos reparse point daemon (reparsed) allows a local user to crash the daemon. get_fs_locations() in usr/src/cmd/fs.d/nfs/rp_basic/libnfs_basic.c, part of the nfs-basic reparse plugin, copies the host and path components of a reparse string into a fixed 1024-byte stack buffer without checking their length. The reparsed door at /var/run/reparsed_door is readable by all users and the door server does not check the caller's credentials, so an unprivileged local user can send an nfs-basic request with an overlong host or path component to overflow the buffer. On systems built with stack protection, which is the default, this causes reparsed to abort; repeated requests place the svc:/system/filesystem/reparse service into maintenance. The service is disabled by default. The flaw has existed since 2009 (illumos-gate commit 2f172c55), and affects any illumos distribution prior to illumos-gate commit 6a2df4aa.
Weakness: CWE-121
Which versions are affected by CVE-2026-104115?
How do I fix CVE-2026-104115?
No fix has been published for CVE-2026-104115 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-104115 being exploited?
There is no known exploitation of CVE-2026-104115 in the wild and no public exploit code.
Sources
Also known as GHSA-gwf6-7hwv-r7vq.