Kernel panic via unsynchronized VF namespace move
Published Sep 4, 2025 · Updated May 23, 2026
Missing synchronization in Linux hv_netvsc, including SIMATIC CN 4100 before V5.0, allows local users to trigger a kernel panic. During namespace cleanup, re-registering the netvsc NIC also moves its VF into the default namespace while default_device_exit_net() iterates the device list, causing the loop to miss its end and dereference NULL. Exploitation requires high-privilege namespace control on a Hyper-V guest with an hv_netvsc NIC and associated VF; the resulting panic interrupts the system.
Summary
What happened
Missing synchronization in Linux hv_netvsc, including SIMATIC CN 4100 before V5.0, allows local users to trigger a kernel panic. During namespace cleanup, re-registering the netvsc NIC also moves its VF into the default namespace while default_device_exit_net() iterates the device list, causing the loop to miss its end and dereference NULL. Exploitation requires high-privilege namespace control on a Hyper-V guest with an hv_netvsc NIC and associated VF; the resulting panic interrupts the system.
The record
- CVE
- CVE-2025-38683
- Published
- Sep 4, 2025
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-820
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Sep 4, 2025CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=04d748d4bd2d86739b159563f257e3dc5492c88d
- Affected versionversion=31a38a908c98aebc7a1104dab5f1ba199f234b7b
- Affected versionversion=3eb6aa870057da9f1304db660f68b9c2eb7e856d <3ca41ab55d23a0aa71661a5a56a8f06c11db90dc
- Affected versionversion=4.19.323 <4.20
- Affected versionversion=4c262801ea60c518b5bebc22a09f5b78b3147da2 <33caa208dba6fa639e8a92fd0c8320b652e5550c
- Affected versionversion=4c262801ea60c518b5bebc22a09f5b78b3147da2 <4293f6c5ccf735b26afeb6825def14d830e0367b
- Affected versionversion=4c262801ea60c518b5bebc22a09f5b78b3147da2 <5276896e6923ebe8c68573779d784aaf7d987cce
- Affected versionversion=4c262801ea60c518b5bebc22a09f5b78b3147da2 <d036104947176d030bec64792d54e1b4f4c7f318
- Affected versionversion=4faa6e3e66b3251eb4bf5761d2f3f0f14095aaca <4eff1e57a8ef98d70451b94e8437e458b27dd234
- Affected versionversion=5.10.229 <5.10.241
- Affected versionversion=5.15.170 <5.15.190
- Affected versionversion=5.4.285 <5.5
- Affected versionversion=6.1.115 <6.1.149
- Affected versionversion=6.11.6 <6.12
- Affected versionversion=6.12
- Affected versionversion=62c85b9a0dd7471a362170323e1211ad98ff7b4b <2a70cbd1aef8b8be39992ab7b776ce1390091774
- Affected versionversion=6.6.59 <6.6.103
- Affected versionversion=7abd221a55a61b6b2bf0e80f850bfc0ae75c7e01
- Affected versionversion=b7a396f76ada277d049558db648389456458af65 <3467c4ebb334658c6fcf3eabb64a6e8b2135e010
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Attacks
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