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CVE-2026-13212— Zephyr virtio driver calls an arbitrary function pointer from an out-of-range used-ring descriptor id

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.

Zephyr 系统中的 virtio 驱动程序未对 virtio 设备写入使用环（used ring）的描述符链头 ID 进行验证。在 函数（位于 ）中，设备写入的 被直接用作 和 数组的索引，而这两个数组均仅分配了恰好 个条目。 中存储的是包含回调函数指针和不透明参数（opaque）的 回调条目，随后通过索引获取回调指针并以 的形式进行调用。 由于该 ID 被作为 16 位无符号整数直接消费且未进行边界检查，恶意或已遭控制的 virtio 后端（例如不受信任的 hypervisor，或通过 PCI 或 MMIO

CVSS 8.8 · High
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I. Basic Information for CVE-2026-13212

Vulnerability Information
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Vulnerability Title
Zephyr virtio driver calls an arbitrary function pointer from an out-of-range used-ring descriptor id
Source: CVE Program / CVE List V5
Vulnerability Description
The Zephyr virtio driver does not validate the descriptor-chain head id that the virtio device writes into the used ring. In virtio_isr() (drivers/virtio/virtio_common.c), the device-written vq->used->ring[idx].id is used directly as an index into vq->recv_cbs[] and vq->desc[], which are both allocated with exactly vq->num entries. recv_cbs[] holds {cb, opaque} callback entries, and the indexed callback pointer is then invoked as cbe.cb(cbe.opaque, used_len). Because the id is consumed as a 16-bit value with no bound check, a malicious or compromised virtio backend (an untrusted hypervisor, or an untrusted hardware/peer-processor virtio device on a PCI or MMIO transport) can supply an id far beyond vq->num. This causes an out-of-bounds read of a {function pointer, argument} pair from heap memory beyond recv_cbs[], after which the driver calls that attacker-shaped pointer in the guest's interrupt context. No guest privileges or user interaction are required; the backend triggers it by writing the shared used ring and raising the queue interrupt. The result is an arbitrary / attacker-influenced function-pointer call in the Zephyr guest, i.e. a control-flow-hijack primitive that can lead to code execution or, at minimum, a reliable crash. The fix rejects any used-ring id >= vq->num before indexing recv_cbs[]/desc[] or invoking the callback. This affects builds using CONFIG_VIRTIO with the PCI or MMIO transport.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 4.2.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-13212

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III. Intelligence Information for CVE-2026-13212

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Patches & Fixes for CVE-2026-13212 (1)

Vendor Advisories for CVE-2026-13212 (1)

Same Patch Batch · zephyrproject · 2026-08-24 · 4 CVEs total

CVE-2026-9728 6.4 MEDIUM TOCTOU race in mbox_send syscall verifier allows userspace to leak kernel memory
CVE-2026-13343 5.3 MEDIUM Uninitialised stack memory disclosure in the MIDI 2.0 UMP Stream responder
CVE-2026-13213 5.3 MEDIUM Bluetooth HAS: NULL-pointer dereference DoS when a bonded peer reconnects before bt_has_re

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-129

V. Comments for CVE-2026-13212

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