CVE-2026-110912DragonFlyBSD Vulnerability
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.
Published Oct 15, 2026 · Updated Oct 16, 2026 · Also known as EUVD-2026-101819, GHSA-r2jj-8gwv-75pj
Key Facts
Patch in the next maintenance window- CVE-2026-110912 is a high-severity vulnerability (CVSS 7.1 v4) affecting DragonFlyBSD.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 0.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including DragonFlyBSD 4bb22ffcf2e9fb44995fbfd9945194afc87fb182.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v4
7.1
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
EPSS (30-day exploit likelihood)
0.2%
Exploit maturity
Proof of concept
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
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
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DragonFlyBSDDragonflybsd | >= 984263bcb83ad82313113c6ac840d99124d8f90c | 4bb22ffcf2e9fb44995fbfd9945194afc87fb182 |
Patched Releases
DragonFlyBSD
4bb22ffcf2e9fb44995fbfd9945194afc87fb182
Timeline
Publicly disclosed
Oct 15, 2026
Last updated
Oct 16, 2026
Weakness Type
- CWE-130 Improper Handling of Length Parameter Inconsistency
References
- advisorycve.org · CVERecord
- advisorynvd.nist.gov · CVE-2026-110912
- othergithub.com · CVE-2026-110912
- othergithub.com · DragonFlyBSD
- othergithub.com · 4bb22ff
FAQ
Common Questions.
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.
Affected: DragonFlyBSD versions >= 984263bcb83ad82313113c6ac840d99124d8f90c. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including DragonFlyBSD 4bb22ffcf2e9fb44995fbfd9945194afc87fb182.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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