CVE-2026-110912
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.
CVE-2026-110912
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-110912
DragonFlyBSD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/DragonFlyBSD/DragonFlyBSD",
"vendor": "DragonFlyBSD",
"modules": [
"IPv4 ARP (sys/netinet)"
],
"product": "DragonFlyBSD",
"versions": [
{
"status": "affected",
"version": "984263bcb83ad82313113c6ac840d99124d8f90c",
"lessThan": "4bb22ffcf2e9fb44995fbfd9945194afc87fb182",
"versionType": "git"
}
],
"programFiles": [
"sys/netinet/if_ether.c"
],
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "arpintr()"
},
{
"name": "in_arpinput()"
},
{
"name": "in_arpreply()"
}
]
}
]- Related CVEs
- CVE-2026-110912
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #32296 · Revision 1
- Added to Heist Feed
- Publisher date