CVE-2025-39944— 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，该漏洞源于取消延迟工作项时未确保完全完成，可能导致释放后重用。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 2958d17a898416c6193431676f6130b68a2cb9fc< 2786879aebf363806a13d41e8d5f99202ddd23d9 |
affected |
2958d17a898416c6193431676f6130b68a2cb9fc< d2cfefa14ce8137b17f99683f968bebf134b6a48 |
affected | ||
2958d17a898416c6193431676f6130b68a2cb9fc< ff27e23b311fed4d25e3852e27ba693416d4c7b3 |
affected | ||
2958d17a898416c6193431676f6130b68a2cb9fc< 5ca20bb7b4bde72110c3ae78423cbfdd0157aa36 |
affected | ||
2958d17a898416c6193431676f6130b68a2cb9fc< f8b4687151021db61841af983f1cb7be6915d4ef |
affected | ||
6.1 |
affected | ||
< 6.1 |
unaffected | ||
6.1.154≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2025-39944 基础信息
漏洞信息
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Vulnerability Title
octeontx2-pf: Fix use-after-free bugs in otx2_sync_tstamp()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
octeontx2-pf: Fix use-after-free bugs in otx2_sync_tstamp()
The original code relies on cancel_delayed_work() in otx2_ptp_destroy(),
which does not ensure that the delayed work item synctstamp_work has fully
completed if it was already running. This leads to use-after-free scenarios
where otx2_ptp is deallocated by otx2_ptp_destroy(), while synctstamp_work
remains active and attempts to dereference otx2_ptp in otx2_sync_tstamp().
Furthermore, the synctstamp_work is cyclic, the likelihood of triggering
the bug is nonnegligible.
A typical race condition is illustrated below:
CPU 0 (cleanup) | CPU 1 (delayed work callback)
otx2_remove() |
otx2_ptp_destroy() | otx2_sync_tstamp()
cancel_delayed_work() |
kfree(ptp) |
| ptp = container_of(...); //UAF
| ptp-> //UAF
This is confirmed by a KASAN report:
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800aa09a18 by task bash/136
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? __pfx___run_timer_base.part.0+0x10/0x10
? __pfx_read_tsc+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
run_timer_softirq+0xd1/0x190
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 1:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
otx2_ptp_init+0xb1/0x860
otx2_probe+0x4eb/0xc30
local_pci_probe+0xdc/0x190
pci_device_probe+0x2fe/0x470
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__driver_attach+0xd2/0x310
bus_for_each_dev+0xed/0x170
bus_add_driver+0x208/0x500
driver_register+0x132/0x460
do_one_initcall+0x89/0x300
kernel_init_freeable+0x40d/0x720
kernel_init+0x1a/0x150
ret_from_fork+0x10c/0x1a0
ret_from_fork_asm+0x1a/0x30
Freed by task 136:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
otx2_ptp_destroy+0x38/0x80
otx2_remove+0x10d/0x4c0
pci_device_remove+0xa6/0x1d0
device_release_driver_internal+0xf8/0x210
pci_stop_bus_device+0x105/0x150
pci_stop_and_remove_bus_device_locked+0x15/0x30
remove_store+0xcc/0xe0
kernfs_fop_write_iter+0x2c3/0x440
vfs_write+0x871/0xd70
ksys_write+0xee/0x1c0
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the delayed work item is properly canceled before the otx2_ptp is
deallocated.
This bug was initially identified through static analysis. To reproduce
and test it, I simulated the OcteonTX2 PCI device in QEMU and introduced
artificial delays within the otx2_sync_tstamp() function to increase the
likelihood of triggering the bug.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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，该漏洞源于取消延迟工作项时未确保完全完成，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-2025-39944 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-39944 补丁与修复 (5)
同批安全公告 · Linux · 2025-10-04 · 共 144 条
| CVE-2025-39932 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39946 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39948 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39933 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39943 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53600 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53615 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39952 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53589 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53586 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50493 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53598 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53566 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53536 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53560 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53559 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53557 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53537 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53539 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53545 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 144 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-39944
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