PT-2026-53093 · Undefined · Undefined
Publicado
2026-06-28
·
Atualizado
2026-06-28
·
CVE-2026-10646
CVSS v3.1
7.4
Alta
| Vetor | AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H |
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 memory, leading to crashes/denial of service or memory corruption. The fix cancels the timed-out query by name and type before retrying and resets the local semaphore, eliminating the stale callback path. Affected: Zephyr v4.0.0 through v4.4.0.
Correção
Use After Free
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