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Use-after-return in `zsock_getaddrinfo()` when a timed-out DNS query is retried without cancellation

Type: advisorySource: Official CVE List1 source record

Zephyr's BSD-sockets getaddrinfo() implementation (subsys/net/lib/sockets/getaddrinfo.c) passes a pointer to a stack-allocated state object (struct getaddrinfo_state ai_state) as the user_data of an asynchronous DNS resolver query. The socket layer waits on a semaphore with a timeout deliberately set slightly longer than the resolver's own per-query timeout. When that semaphore wait nonetheless times out (-EAGAIN) - which can occur when the resolver's timeout work is delayed by workqueue contention, or in the documented multi-retry configuration where CONFIG_NET_SOCKETS_DNS_TIMEOUT exceeds CONFIG_NET_SOCKETS_DNS_BACKOFF_INTERVAL - the pre-fix code retries the query (goto again) without cancelling the previous one and without resetting the semaphore. The previous query slot remains active in the resolver with its callback and the stack pointer as user_data, and ai_state->dns_id is overwritten so the stale query can no longer be cancelled. A subsequent DNS response delivered over UDP and matched by its 16-bit transaction id (in dispatcher_cb()/dns_read()), or the resolver's own delayed query-timeout work, then invokes dns_resolve_cb() against the now out-of-scope stack frame, writing through the stale pointer (state->status, state->idx, state->ai_arr[], and k_sem_give()). Because the triggering response is network-delivered and its 16-bit id is spoofable/replayable by an on- or off-path attacker, this is a network-influenceable use-after-return that can corrupt reused stack mem

Announced Group revision 1
Original source ↗

CVE-2026-10646

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-2026-10646

zephyr

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.

[
  {
    "vendor": "zephyrproject",
    "product": "zephyr",
    "versions": [
      {
        "status": "affected",
        "version": "3.7.0",
        "lessThan": "4.3.1",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.4.0",
        "lessThan": "4.4.2",
        "versionType": "semver"
      }
    ],
    "packageName": "zephyr",
    "programFiles": [
      "include/zephyr/net/dns_resolve.h",
      "subsys/net/lib/sockets/getaddrinfo.c"
    ],
    "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-10646

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30756 · Revision 1
Added to Heist Feed
Publisher date
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