CVE-2026-10639

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Source

https://cve.org/CVERecord?id=CVE-2026-10639

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10639.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-10639

Aliases

GHSA-qhrf-w466-qmpw

Published

2026-06-16T13:22:23Z

Modified

2026-11-05T08:04:00Z

Severity

4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L CVSS Calculator

Summary

Use-after-free reading `net_pkt_iface()` of a sent ICMPv4 echo-reply packet in `icmpv4_handle_echo_request()`

Details

In Zephyr's native IPv4 stack, icmpv4_handle_echo_request() in subsys/net/ip/icmpv4.c builds an echo-reply packet (reply), hands it to net_try_send_data(), and then, on success, calls net_stats_update_icmp_sent(net_pkt_iface(reply)). net_try_send_data() transfers ownership of reply to the TX path (net_if_try_queue_tx -> net_if_tx -> L2/driver send, or the asynchronous net_if_tx_thread), which can unref it to refcount 0 and return the struct net_pkt to its slab (net_pkt_unref -> k_mem_slab_free) before the stats line runs. net_core.c documents this exact contract ('the pkt might contain garbage already ... do not use pkt after that call').

The post-send net_pkt_iface(reply) therefore reads reply->iface out of a freed (and possibly already reallocated) net_pkt, a use-after-free read; with CONFIG_NET_STATISTICS_PER_INTERFACE the stats macro additionally increments a counter through that value, i.e. a dereference/write through a stale or recycled-slot pointer.

The path is reached unauthenticated by any remote host that pings the device (net_icmpv4_input -> net_icmp_call_ipv4_handlers -> icmpv4_handle_echo_request) and is gated on CONFIG_NET_STATISTICS_ICMP. Impact is a probabilistic read of recycled packet memory plus a possible wild-pointer write under a timing race, leading most likely to corrupted interface statistics or a remotely triggerable crash (DoS).

The defect was introduced in 2019 (v1.14) and is present through v4.4.0. The companion change in net_icmpv4_send_error() is not a use-after-free because it reads net_pkt_iface(orig), the caller-owned received packet, which stays alive across the send. The fix caches the interface pointer from the live received packet before sending and uses it for the post-send stats updates.

Database specific

{
    "cna_assigner": "zephyr",
    "cwe_ids": [
        "CWE-416"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10639.json"
}

References

Affected packages

Git / github.com/zephyrproject-rtos/zephyr

Affected ranges

Type

GIT

Repo

https://github.com/zephyrproject-rtos/zephyr

Events

Introduced

413b789deb391d3a37d06b463288a5fe765ee57e

Fixed

75f67d766726351b30199f9a2bf55803d717a3be

Introduced

684c9e8f32e4373a21098559f748f06915f950c9

Fixed

1f6485eca25431b5ff27ce9a754218c9e559bbbb

Fixed

86e21665d4641f304dc3895bfb03b8f89db83291

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "4.2.0"
                },
                {
                    "fixed": "4.3.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "4.4.0"
                },
                {
                    "fixed": "4.4.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "86e21665d4641f304dc3895bfb03b8f89db83291"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v4.*

v4.2.0

v4.3.0

v4.3.0-rc1

v4.3.0-rc2

v4.3.0-rc3

v4.3.1-rc1

v4.4.0

v4.4.1-rc1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10639.json"

vanir_signatures

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vanir_signatures_modified

"2026-11-05T08:04:00Z"