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CVE-2025-39796— net: lapbether: ignore ops-locked netdevs

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于未正确处理ops-locked网络设备，可能导致锁依赖问题。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 4c975fd700022c90e61a46326e3444e08317876e< 57a7ef338a2cd62a22a15a199ab9afd3d953df55 affected
4c975fd700022c90e61a46326e3444e08317876e< 628e233c1fefcc227fae9bdcff6be8ac92e1b4d2 affected
4c975fd700022c90e61a46326e3444e08317876e< 53898ebabe843bfa7baea9dae152797d5d0563c9 affected
6.15 affected
< 6.15 unaffected
6.15.11≤ 6.15.* unaffected
6.16.2≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39796

Vulnerability Information
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Vulnerability Title
net: lapbether: ignore ops-locked netdevs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: lapbether: ignore ops-locked netdevs Syzkaller managed to trigger lock dependency in xsk_notify via register_netdevice. As discussed in [0], using register_netdevice in the notifiers is problematic so skip adding lapbeth for ops-locked devices. xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1645 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] unregister_netdevice_many_notify+0xf9d/0x2700 net/core/dev.c:12077 unregister_netdevice_many net/core/dev.c:12140 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11984 register_netdevice+0x18f1/0x2270 net/core/dev.c:11149 lapbeth_new_device drivers/net/wan/lapbether.c:420 [inline] lapbeth_device_event+0x5b1/0xbe0 drivers/net/wan/lapbether.c:462 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9497 netif_change_flags+0x108/0x160 net/core/dev.c:9526 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200 inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001 0: https://lore.kernel.org/netdev/20250625140357.6203d0af@kernel.org/
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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，该漏洞源于未正确处理ops-locked网络设备，可能导致锁依赖问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4c975fd700022c90e61a46326e3444e08317876e ~ 57a7ef338a2cd62a22a15a199ab9afd3d953df55 -
Linux Linux 6.15 -

II. Public POCs for CVE-2025-39796

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III. Intelligence Information for CVE-2025-39796

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Same Patch Batch · Linux · 2025-09-12 · 7 CVEs total

CVE-2025-39792 7.8 HIGH dm: Always split write BIOs to zoned device limits
CVE-2025-39793 7.8 HIGH io_uring/memmap: cast nr_pages to size_t before shifting
CVE-2025-39798 7.3 HIGH NFS: Fix the setting of capabilities when automounting a new filesystem
CVE-2025-39794 ARM: tegra: Use I/O memcpy to write to IRAM
CVE-2025-39795 block: avoid possible overflow for chunk_sectors check in blk_stack_limits()
CVE-2025-39797 xfrm: Duplicate SPI Handling

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39796

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