CVE-2026-43232— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FarSync T系列卡分离时任务处理程序仍在运行，可能导致释放后重用。
影响版本矩阵 31
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 51e2d1b84acac39f79cacb60e6e154ce00a9d308< cac048ebfbb92d91d719f74b59177cb70a7633b8 |
affected |
998b4e54f517961d3d75144c088a24423e003005< 086131807d119238cd464e5b0845e48d938dfd79 |
affected | ||
bb1715a6bfb0c57a68524732a376498a2569f016< ae894e47e1cd5a6bf8a0423d888c45df8b2b02dc |
affected | ||
2f623aaf9f31de968dea6169849706a2f9be444c< 337d7b4112a47984ee319171b75b73bab47e7924 |
affected | ||
2f623aaf9f31de968dea6169849706a2f9be444c< 200bdb8d367ca9b478f9c56ebe56411604d55c81 |
affected | ||
2f623aaf9f31de968dea6169849706a2f9be444c< 21d341fe514fd07e345ed264c9eee21cb2061ca2 |
affected | ||
2f623aaf9f31de968dea6169849706a2f9be444c< 04edfdfdfcdefc02408ab670607261b0a0a9a02e |
affected | ||
2f623aaf9f31de968dea6169849706a2f9be444c< bae8a5d2e759da2e0cba33ab2080deee96a09373 |
affected | ||
| … +23 条更多 | |||
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一、 漏洞 CVE-2026-43232 基础信息
漏洞信息
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Vulnerability Title
net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
When the FarSync T-series card is being detached, the fst_card_info is
deallocated in fst_remove_one(). However, the fst_tx_task or fst_int_task
may still be running or pending, leading to use-after-free bugs when the
already freed fst_card_info is accessed in fst_process_tx_work_q() or
fst_process_int_work_q().
A typical race condition is depicted below:
CPU 0 (cleanup) | CPU 1 (tasklet)
| fst_start_xmit()
fst_remove_one() | tasklet_schedule()
unregister_hdlc_device()|
| fst_process_tx_work_q() //handler
kfree(card) //free | do_bottom_half_tx()
| card-> //use
The following KASAN trace was captured:
==================================================================
BUG: KASAN: slab-use-after-free in do_bottom_half_tx+0xb88/0xd00
Read of size 4 at addr ffff88800aad101c by task ksoftirqd/3/32
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcb/0x5d0
? do_bottom_half_tx+0xb88/0xd00
kasan_report+0xb8/0xf0
? do_bottom_half_tx+0xb88/0xd00
do_bottom_half_tx+0xb88/0xd00
? _raw_spin_lock_irqsave+0x85/0xe0
? __pfx__raw_spin_lock_irqsave+0x10/0x10
? __pfx___hrtimer_run_queues+0x10/0x10
fst_process_tx_work_q+0x67/0x90
tasklet_action_common+0x1fa/0x720
? hrtimer_interrupt+0x31f/0x780
handle_softirqs+0x176/0x530
__irq_exit_rcu+0xab/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
...
Allocated by task 41 on cpu 3 at 72.330843s:
kasan_save_stack+0x24/0x50
kasan_save_track+0x17/0x60
__kasan_kmalloc+0x7f/0x90
fst_add_one+0x1a5/0x1cd0
local_pci_probe+0xdd/0x190
pci_device_probe+0x341/0x480
really_probe+0x1c6/0x6a0
__driver_probe_device+0x248/0x310
driver_probe_device+0x48/0x210
__device_attach_driver+0x160/0x320
bus_for_each_drv+0x101/0x190
__device_attach+0x198/0x3a0
device_initial_probe+0x78/0xa0
pci_bus_add_device+0x81/0xc0
pci_bus_add_devices+0x7e/0x190
enable_slot+0x9b9/0x1130
acpiphp_check_bridge.part.0+0x2e1/0x460
acpiphp_hotplug_notify+0x36c/0x3c0
acpi_device_hotplug+0x203/0xb10
acpi_hotplug_work_fn+0x59/0x80
...
Freed by task 41 on cpu 1 at 75.138639s:
kasan_save_stack+0x24/0x50
kasan_save_track+0x17/0x60
kasan_save_free_info+0x3b/0x60
__kasan_slab_free+0x43/0x70
kfree+0x135/0x410
fst_remove_one+0x2ca/0x540
pci_device_remove+0xa6/0x1d0
device_release_driver_internal+0x364/0x530
pci_stop_bus_device+0x105/0x150
pci_stop_and_remove_bus_device+0xd/0x20
disable_slot+0x116/0x260
acpiphp_disable_and_eject_slot+0x4b/0x190
acpiphp_hotplug_notify+0x230/0x3c0
acpi_device_hotplug+0x203/0xb10
acpi_hotplug_work_fn+0x59/0x80
...
The buggy address belongs to the object at ffff88800aad1000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 28 bytes inside of
freed 1024-byte region
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xaad0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0100000000000003 ffffea00002ab401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800aad0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88800aad0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88800aad1000: fa fb
---truncated---
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FarSync T系列卡分离时任务处理程序仍在运行，可能导致释放后重用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-43232 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-43232 补丁与修复 (8)
同批安全公告 · Linux · 2026-05-06 · 共 224 条
| CVE-2026-43208 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43125 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43185 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43186 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43198 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43114 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43117 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43197 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43083 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43112 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43215 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43158 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43283 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43176 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43110 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43113 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43172 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43249 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43239 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43187 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 224 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-43232
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