CVE-2026-98302— fddi: skfp 设置 MAC 地址时空指针解引用漏洞
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，已修复以下漏洞： 网络子系统：fddi: skfp：在接口关闭状态下设置 MAC 地址时修复空指针解引用问题 无条件调用 ，而未检查 。 首先调用 ，将 设置为 ；随后调用 ，该函数遍历两个发送队列： 仅由 填充，而 通过 -> -> -> -> -> 这条路径被调用。私有区域由 分配并初始化为零。因此，对于从未被激活（bring up）的接口，两个队列指针仍然为 。 顶部的 测试未能捕获此问题，因为 刚刚设置了 状态；函数随后进入循环并尝试解引用 指针。虽然 自身也会调用 ，但这是在清空队
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 835903bea770ad96ab4322e18d98e00f8e0b39c3 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5fd0f401b3eee95c93daa35ef99cb03d676031f0 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 731db6110b3148331ed8d5d11a564bfd520721d9 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 822903ed991971780db1db1be31a4f00e2b13e30 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 616ba18b2cfb72b7bea214bdd72df2485b2e37dc |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d6f63fdb298d546a47790cb373db65462c264d04 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 438131e7ae847e907d345bf504d7e25585561b5c |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7c8810c2e69c3d9ca6df870b40ae9218e50b4fb1 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-98302 基础信息
漏洞信息
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Vulnerability Title
net: fddi: skfp: fix NULL deref when setting the MAC address while down
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: fddi: skfp: fix NULL deref when setting the MAC address while down
skfp_ctl_set_mac_address() calls ResetAdapter() unconditionally, without
checking netif_running(). ResetAdapter() first calls card_stop(), which
sets smc->hw.hw_state to STOPPED, and then mac_drv_clear_tx_queue(),
which walks the two transmit queues:
for (i = QUEUE_S; i <= QUEUE_A0; i++) {
queue = smc->hw.fp.tx[i] ;
...
t = queue->tx_curr_get ;
smc->hw.fp.tx[] is only populated by init_tx(), which is reached from
skfp_open() through init_smt() -> init_fddi_driver() -> init_fplus() ->
init_mac() -> init_tx(). The private area is allocated and zeroed by
alloc_fddidev(), so on an interface that has never been brought up both
queue pointers are still NULL. The hw_state test at the top of
mac_drv_clear_tx_queue() does not catch this, because card_stop() has
just set STOPPED; the function proceeds into the loop and dereferences
NULL. ResetAdapter() does call init_smt() itself, but only after the
queues have been cleared.
Setting the MAC address on a down interface therefore oopses:
ip link set dev fddi0 address 02:00:00:00:00:01
BUG: KASAN: null-ptr-deref in mac_drv_clear_tx_queue+0x68/0x2c0 [skfp]
Read of size 8 at addr 0000000000000010 by task ip/302
Call Trace:
<TASK>
mac_drv_clear_tx_queue+0x68/0x2c0 [skfp 6c01d4bab63c36978bd0a7d7e90837adb44cc37b]
ResetAdapter+0x29/0x100 [skfp 6c01d4bab63c36978bd0a7d7e90837adb44cc37b]
skfp_ctl_set_mac_address+0x57/0x80 [skfp 6c01d4bab63c36978bd0a7d7e90837adb44cc37b]
netif_set_mac_address+0x1e4/0x2c0
do_setlink+0x684/0x2680
</TASK>
Address 0x10 is the offset of tx_curr_get, the third pointer in
struct s_smt_tx_queue, on 64-bit. mac_drv_clear_rx_queue(), which
ResetAdapter() calls immediately afterwards, dereferences
smc->hw.fp.rx[QUEUE_R1] in the same way behind the same ineffective
hw_state test; the transmit queue merely crashes first. Both are
covered by the guard below.
Skip the adapter reset when the interface is down. dev_addr_set() is
left unconditional, so the new address is still recorded in
dev->dev_addr. Nothing is lost by not resetting the adapter here:
skfp_open() deliberately re-reads the factory address on every open,
read_address(smc, NULL);
eth_hw_addr_set(dev, smc->hw.fddi_canon_addr.a);
and the comment above it states this is done to discard exactly such an
address override across a close/open cycle. An address set while the
interface is down could not have survived the following open even
before this change, so the guard removes no working behaviour. Guarding
the hardware side of ndo_set_mac_address() with netif_running() is
established practice; skge_set_mac_address() has done so since commit
2eb3e621c4e0 ("skge: set mac address bonding fix").
Guarding the reset as a whole, rather than NULL-checking the queues, is
also what the rest of the driver expects. After a previous open/close
the queue pointers are stale but non-NULL, so there is no crash, yet
ResetAdapter() goes on to call smt_online() and STI_FBI() ("Enable
Board Interrupts") while skfp_close() has already called free_irq() -
the adapter would be brought back online with no handler installed. The
only other ResetAdapter() caller is skfp_interrupt(), which by
construction runs only while the device is open.
Found by automated driver testing against an emulated SysKonnect FDDI
adapter under a KASAN-enabled 7.0.0 kernel. Triggering it requires
CAP_NET_ADMIN.
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-2026-98302 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-98302 补丁与修复 (8)
同批安全公告 · Linux · 2026-10-06 · 共 208 条
| CVE-2026-98323 | 9.8 CRITICAL | RDMA/siw 分片头拷贝边界漏洞 |
| CVE-2026-98365 | 9.8 CRITICAL | RDMA/rxe mr_check_range() 整数溢出导致越界访问漏洞 |
| CVE-2026-98282 | 8.8 HIGH | PowerPC IOMMU iommu_tce_check_ioba 溢出验证修复 |
| CVE-2026-98283 | 8.8 HIGH | KVM: PPC Book3S HV tlbie_all_lpid 使用后释放漏洞 |
| CVE-2026-98339 | 8.8 HIGH | cfg80211 移除过时条目时过滤BSS类型漏洞 |
| CVE-2026-98171 | 8.8 HIGH | smb 客户端修复复合 PDU 中 next_buffer UAF 及 NextCommand 越界漏洞 |
| CVE-2026-98261 | 8.1 HIGH | CIFS 服务器 cifs_chan_skip_or_disable() 函数中的使用后释放漏洞 |
| CVE-2026-98357 | 8.1 HIGH | IB/isert 释放连接前等待控制PDU完成漏洞 |
| CVE-2026-98239 | 8.1 HIGH | lan743x 网卡 RX 校验和使用后释放漏洞 |
| CVE-2026-98305 | 7.8 HIGH | mxl862xx 网络驱动在 teardown 时禁用统计轮询 |
| CVE-2026-98341 | 7.8 HIGH | WiFi: cfg80211驱动扫描请求释放漏洞 |
| CVE-2026-98320 | 7.8 HIGH | netfilter flowtable 在流释放前持有 ct 引用漏洞 |
| CVE-2026-98228 | 7.8 HIGH | MIPS EQE4 系统内核配置错误 |
| CVE-2026-98229 | 7.8 HIGH | Linux内核xfrm安全路径重置前保存输入状态数据 |
| CVE-2026-98318 | 7.8 HIGH | SMB客户端修复相对原生符号链接目标验证漏洞 |
| CVE-2026-98315 | 7.8 HIGH | NTFS运行列表更新缺少锁保护 |
| CVE-2026-98260 | 7.8 HIGH | exec 清理 POSIX 定时器漏洞 |
| CVE-2026-98256 | 7.8 HIGH | Signal 执行函数竞争条件漏洞 |
| CVE-2026-98258 | 7.8 HIGH | Linux内核posix-cpu-timers释放过期列表定时器漏洞 |
| CVE-2026-98254 | 7.8 HIGH | swiotlb 高内存页查找使用调整后的地址 |
显示前 20 条，共 208 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98302
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