🔴 严重 | CVE-2026-53247 — In the Linux kernel, the following vulnerability has be
🔴 《严重安全漏洞：CVE-2026-53247》
CVSS 评分: 严重（9.8） CVE ID: CVE-2026-53247
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst
with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, a use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.
| 字段 | 值 |
|---|---|
| CVE ID | CVE-2026-53247 |
| CVSS 评分 | 9.8 |
| 严重程度 | 严重 |
| 发布时间 | 2026-06-25 |
| 状态 | Received |
数据来源: NVD | 获取时间: 2026-06-28 18:14