PatchTheCVECVE-2026-10637: subsys/net/ip/ipv6_mld.c:mld_send() read the packet interface via net_pkt_iface(pkt) after net_send_data(pkt)
CVE-2026-10637 is a medium-severity flaw (CVSS 5.9) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
subsys/net/ip/ipv6_mld.c:mld_send() read the packet interface via net_pkt_iface(pkt) after net_send_data(pkt) returned successfully. Per the network stack's ownership contract (include/zephyr/net/net_core.h, and the explicit warning in subsys/net/ip/net_core.c:453-460 'do not use pkt after that call'), a successful send transfers ownership of the net_pkt and the L2 driver frees it (e.g. ethernet_send() unrefs the packet on success, subsys/net/l2/
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Adjacent network |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2026-06-16 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-10637?
zephyr: upgrade to 4.5.0. Exact commands for each OS are on this page.
Is CVE-2026-10637 being exploited?
CVE-2026-10637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-10637 affect?
CVE-2026-10637 affects zephyr. Severity is medium (CVSS 5.9). subsys/net/ip/ipv6_mld.c:mld_send() read the packet interface via net_pkt_iface(pkt) after net_send_data(pkt) returned successfully. Per the network stack's ownership contract (include/zephyr/net/net_core.h, and the explicit warning in subs
How urgent is CVE-2026-10637?
Priority 31/100. Public exploit reference
Related CVEs
- CVE-2026-10638 MEDIUM 5.9 UPGRADE subsys/net/ip/icmpv6.c reads the network interface from a net_pkt after that packet has been handed to net_try
- CVE-2026-10641 HIGH 7.1 UPGRADE Zephyr's Bluetooth Classic Hands-Free Profile (HFP) Hands-Free role parser (subsys/bluetooth/host/classic/hfp_
- CVE-2026-10651 HIGH 7.1 UPGRADE bt_sdp_parse_attribute() in subsys/bluetooth/host/classic/sdp.c validated only that the SDP record buffer held
- CVE-2026-10639 MEDIUM 4.8 UPGRADE In Zephyr's native IPv4 stack, icmpv4_handle_echo_request() in subsys/net/ip/icmpv4.c builds an echo-reply pac
- CVE-2026-10658 HIGH 7.1 UPGRADE bt_iso_recv() in subsys/bluetooth/host/iso.c pulled the ISO SDU header (4 bytes) or, when the timestamp flag i