Vulnerability · Published Oct 15, 2026 · Assigned by mitre
CVE-2026-110912
High 7.1
In plain English
A high-severity security flaw in DragonFlyBSD from DragonFlyBSD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
In DragonFly BSD through 6.4.2 before 4bb22ff, the ARP input handlers arpintr() and in_arpinput() (sys/netinet/if_ether.c) do not validate the hardware address length (ar_hln) and protocol address length (ar_pln) fields of incoming ARP packets. in_arpreply() then uses these attacker-controlled values as memcpy lengths when copying from kernel buffers that are only 6 and 4 bytes long, resulting in an out-of-bounds read of kernel heap and stack memory that is copied into the ARP reply sent back to the requester. An unauthenticated attacker on the adjacent network can use a single crafted ARP request to disclose up to roughly 250 bytes of each type of kernel memory, including kernel pointers. This is expected to be fixed in the 6.6 stable release when that is available.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DragonFlyBSD | DragonFlyBSD | 984263bcb83ad82313113c6ac840d99124d8f90c – before 4bb22ffcf2e9fb44995fbfd9945194afc87fb182 |
Weakness: CWE-130 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N