CVE-2026-98563— phylink 网络驱动 PHY 初始化逻辑缺陷
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在 Linux 内核中，以下漏洞已得到修复： net: phylink：仅在 PHY 初始化无法失败时才记录 PHY 函数在最后一个可能失败的步骤之前，就将 PHY 设备指针存储到了 中。对于实现了 LPI（低功耗空闲）的 MAC 控制器而言， 可能会因真实的 MDIO 错误而失败。此时，调用方会执行 进行回滚，但 并不知晓 的状态，导致一个指向已不再挂载的 PHY 的指针在连接失败后仍然存活。 该问题造成的后果取决于调用方是如何进入此代码路径的： 1. 路径：该函数会经过 ，而后者在 已设置时会拒绝再次挂载。这会
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 03abf2a7c65451e663b078b0ed1bfa648cd9380f< 4e7a4af364c2048bafb213bf0ef4a89dcbe1bfd4 |
affected |
03abf2a7c65451e663b078b0ed1bfa648cd9380f< 671a68654a9d319d7f0d53a6321db3d9b391bdef |
affected | ||
03abf2a7c65451e663b078b0ed1bfa648cd9380f< a940003f44e7e441c228151dd212642152700ec8 |
affected | ||
6.14 |
affected | ||
< 6.14 |
unaffected | ||
6.18.55≤ 6.18.* |
unaffected | ||
7.2.9≤ 7.2.* |
unaffected | ||
7.3-rc5≤ * |
unaffected |
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一、 漏洞 CVE-2026-98563 基础信息
漏洞信息
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Vulnerability Title
net: phylink: record the PHY only once bringup cannot fail
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: phylink: record the PHY only once bringup cannot fail
phylink_bringup_phy() stores the PHY in pl->phydev before its last
fallible step: on a MAC whose phylink ops implement LPI,
phy_eee_rx_clock_stop() can fail with a real MDIO error. The callers
unwind with phy_detach(), which knows nothing about pl->phydev, so a
pointer to a PHY that is no longer attached outlives the failed
connect.
What that costs depends on how the caller got here.
phylink_connect_phy() goes through phylink_attach_phy(), which refuses
to attach while pl->phydev is set, turning a transient MDIO error into
a permanent -EBUSY. The SFP path is worse than that: sfp_sm_probe_phy()
answers the failure with phy_device_remove() and phy_device_free(), and
it assigns sfp->mod_phy only past that error return, so nothing clears
pl->phydev and it is left pointing at a freed phy_device that
phylink_resolve() and the ethtool helpers go on reading.
phylink_fwnode_phy_connect() has no such check, so a later connect
overwrites the stale pointer and hides the problem. A disconnect does
not: phylink_disconnect_phy() hands that pointer to phy_disconnect(),
and the second phy_detach() on the same PHY drops references the first
one already released.
Found while making a DSA port survive a PHY whose driver arrives after
the switch probes: keeping the port across a failed connect and
retrying is what makes this window reachable.
Publish the pointer after the last call that can fail instead of
unwinding it afterwards. Nothing between the two points reads
pl->phydev, and the registration that follows cannot fail:
phy_request_interrupt() falls back to polling on its own. The PHY-side
state keeps the order it had, so no MDIO operation moves relative to
another.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-98563 的公开POC
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|---|
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CVE-2026-98563 补丁与修复 (3)
同批安全公告 · Linux · 2026-10-18 · 共 436 条
| CVE-2026-98583 | NFC nfcmrvl 驱动命令长度校验越界漏洞 | |
| CVE-2026-98570 | Linux IPv6 子网路由表项处理信息泄露漏洞 | |
| CVE-2026-98571 | stmmac 驱动 skb 构建失败后内存泄漏漏洞 | |
| CVE-2026-98572 | bpf MIPS32 JEQ/JNE 跳转指令逻辑漏洞 | |
| CVE-2026-98573 | Linux 内核 IPv6 校验和计算整数下溢漏洞 | |
| CVE-2026-98574 | bcmgenet 网络驱动 NAPI 停止前禁用队列漏洞 | |
| CVE-2026-98575 | pn533 NFC 驱动越界读取漏洞 | |
| CVE-2026-98576 | Linux NFC LLCP 服务名日志越界读漏洞 | |
| CVE-2026-98577 | NFC LLCP 模块 WKS SAP 劫持漏洞 | |
| CVE-2026-98578 | Linux st21nfca ISO15693 库存长度验证漏洞 | |
| CVE-2026-98579 | NFC LLCP SDreq TLV 列表泄露漏洞 | |
| CVE-2026-98580 | Linux NFC LLCP 接受队列生命周期竞态条件漏洞 | |
| CVE-2026-98581 | NFC LLCP nfc_llcp_recv_dm 列表损坏/引用计数不同步 | |
| CVE-2026-98582 | ST21NFCA NFC 驱动接收帧大小验证漏洞 | |
| CVE-2026-98594 | tg3 驱动 PHYLIB 资源清理漏洞 | |
| CVE-2026-98591 | bpf skb 动态指针越界漏洞 | |
| CVE-2026-98592 | Spacemit 网络驱动传输描述符处理漏洞 | |
| CVE-2026-98593 | Linux s390 调试功能空指针解引用漏洞 | |
| CVE-2026-98590 | bpf 上下文代码生成逻辑修复 | |
| CVE-2026-98595 | Linux 内核 UDP 4 元组哈希表移除漏洞 |
显示前 20 条，共 436 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98563
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