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CVE-2026-10640— Use-after-free reading `net_pkt` `iface` after send in IPv6 Neighbor Discovery (`ipv6_nbr.c`)

Quick assessment

Affected
zephyrproject zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 3.3.0及之前版本至4.4.0版本存在资源管理错误漏洞，该漏洞源于IPv6邻居发现发送路径中，在数据包已成功发送后仍调用net_pkt_iface(pkt)读取已释放的slab块中的iface指针，当启用CONFIG_NET_STATISTICS_PER_INTERFACE时该指针被解引用以递增统计计数器，导致释放后重用。任何未经验证的链路上节点通过发送ICM

CVSS 4.2 · Medium EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 3.3.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10640

Vulnerability Information
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Vulnerability Title
Use-after-free reading `net_pkt` `iface` after send in IPv6 Neighbor Discovery (`ipv6_nbr.c`)
Source: CVE Program / CVE List V5
Vulnerability Description
Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_nbr.c) updated the per-interface ICMP-sent statistics by calling net_pkt_iface(pkt) after net_send_data(pkt) had already returned successfully. On the success path the network stack owns and releases the packet's reference (the L2/driver send unrefs it, e.g. ethernet_send -> net_pkt_unref), so for a freshly allocated packet with refcount 1 the net_pkt slab block can be freed before the statistics line runs (synchronously when no TX queue thread is configured, or via a concurrent TX thread otherwise). The subsequent net_pkt_iface(pkt) reads pkt->iface from the freed slab block, and with CONFIG_NET_STATISTICS_PER_INTERFACE enabled that loaded pointer is dereferenced to increment iface->stats.icmp.sent, a use-after-free (CWE-416). If the slab block was reallocated in the meantime the read/increment targets unrelated or attacker-influenced memory, yielding corrupted statistics, a fault/crash (denial of service), or potential limited memory corruption. The vulnerable Neighbor Advertisement path is reachable by any unauthenticated on-link node simply by sending ICMPv6 Neighbor Solicitations to a Zephyr node with native IPv6 enabled (handle_ns_input -> net_ipv6_send_na). Affected from v3.3.0 through v4.4.0; the fix uses the already-available iface argument instead of touching the sent packet. Configurations without per-interface statistics dereference only a global counter and are not affected by the memory-safety aspect.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 3.3.0及之前版本至4.4.0版本存在资源管理错误漏洞，该漏洞源于IPv6邻居发现发送路径中，在数据包已成功发送后仍调用net_pkt_iface(pkt)读取已释放的slab块中的iface指针，当启用CONFIG_NET_STATISTICS_PER_INTERFACE时该指针被解引用以递增统计计数器，导致释放后重用。任何未经验证的链路上节点通过发送ICM
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 3.3.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10640

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III. Intelligence Information for CVE-2026-10640

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Patches & Fixes for CVE-2026-10640 (1)

Vendor Advisories for CVE-2026-10640 (1)

Same Patch Batch · zephyrproject · 2026-06-16 · 6 CVEs total

CVE-2026-10635 6.3 MEDIUM Dangling memory-domain pointer (use-after-free) in Xtensa MMU page-table code on memory-do
CVE-2026-10638 5.9 MEDIUM Use-after-free in Zephyr ICMPv6 RX path when updating statistics after sending an echo rep
CVE-2026-10637 5.9 MEDIUM Use-after-free of `net_pkt` in IPv6 MLD send path triggerable by a link-local MLD Query
CVE-2026-10639 4.8 MEDIUM Use-after-free reading `net_pkt_iface()` of a sent ICMPv4 echo-reply packet in `icmpv4_han
CVE-2026-10636 3.7 LOW Use-after-free in Zephyr IPv4 IGMP send path (`igmp_send`)

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-416

V. Comments for CVE-2026-10640

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