CVE-2025-38683

hv_netvsc: Fix panic during namespace deletion with VF

State: Published
Severity: Not scored
Published: Sep 4, 2025
Updated: May 23, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

hv_netvsc: Fix panic during namespace deletion with VF

The existing code move the VF NIC to new namespace when NETDEV_REGISTER is received on netvsc NIC. During deletion of the namespace, default_device_exit_batch() >> default_device_exit_net() is called. When netvsc NIC is moved back and registered to the default namespace, it automatically brings VF NIC back to the default namespace. This will cause the default_device_exit_net() >> for_each_netdev_safe loop unable to detect the list end, and hit NULL ptr:

[ 231.449420] mana 7870:00:00.0 enP30832s1: Moved VF to namespace with: eth0 [ 231.449656] BUG: kernel NULL pointer dereference, address: 0000000000000010 [ 231.450246] #PF: supervisor read access in kernel mode [ 231.450579] #PF: error_code(0x0000) - not-present page [ 231.450916] PGD 17b8a8067 P4D 0 [ 231.451163] Oops: Oops: 0000 [#1] SMP NOPTI [ 231.451450] CPU: 82 UID: 0 PID: 1394 Comm: kworker/u768:1 Not tainted 6.16.0-rc4+ #3 VOLUNTARY [ 231.452042] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/21/2024 [ 231.452692] Workqueue: netns cleanup_net [ 231.452947] RIP: 0010:default_device_exit_batch+0x16c/0x3f0 [ 231.453326] Code: c0 0c f5 b3 e8 d5 db fe ff 48 85 c0 74 15 48 c7 c2 f8 fd ca b2 be 10 00 00 00 48 8d 7d c0 e8 7b 77 25 00 49 8b 86 28 01 00 00 <48> 8b 50 10 4c 8b 2a 4c 8d 62 f0 49 83 ed 10 4c 39 e0 0f 84 d6 00 [ 231.454294] RSP: 0018:ff75fc7c9bf9fd00 EFLAGS: 00010246 [ 231.454610] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 61c8864680b583eb [ 231.455094] RDX: ff1fa9f71462d800 RSI: ff75fc7c9bf9fd38 RDI: 0000000030766564 [ 231.455686] RBP: ff75fc7c9bf9fd78 R08: 0000000000000000 R09: 0000000000000000 [ 231.456126] R10: 0000000000000001 R11: 0000000000000004 R12: ff1fa9f70088e340 [ 231.456621] R13: ff1fa9f70088e340 R14: ffffffffb3f50c20 R15: ff1fa9f7103e6340 [ 231.457161] FS: 0000000000000000(0000) GS:ff1faa6783a08000(0000) knlGS:0000000000000000 [ 231.457707] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 231.458031] CR2: 0000000000000010 CR3: 0000000179ab2006 CR4: 0000000000b73ef0 [ 231.458434] Call Trace: [ 231.458600] <TASK> [ 231.458777] ops_undo_list+0x100/0x220 [ 231.459015] cleanup_net+0x1b8/0x300 [ 231.459285] process_one_work+0x184/0x340

To fix it, move the ns change to a workqueue, and take rtnl_lock to avoid changing the netdev list when default_device_exit_net() is using it.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3eb6aa870057da9f1304db660f68b9c2eb7e856d to before 3ca41ab55d23a0aa71661a5a56a8f06c11db90dcAffected b7a396f76ada277d049558db648389456458af65 to before 3467c4ebb334658c6fcf3eabb64a6e8b2135e010Affected 4faa6e3e66b3251eb4bf5761d2f3f0f14095aaca to before 4eff1e57a8ef98d70451b94e8437e458b27dd234Affected 62c85b9a0dd7471a362170323e1211ad98ff7b4b to before 2a70cbd1aef8b8be39992ab7b776ce1390091774Affected 4c262801ea60c518b5bebc22a09f5b78b3147da2 to before d036104947176d030bec64792d54e1b4f4c7f318Affected 4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 5276896e6923ebe8c68573779d784aaf7d987cceAffected 4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 4293f6c5ccf735b26afeb6825def14d830e0367bAffected 4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 33caa208dba6fa639e8a92fd0c8320b652e5550cAffected 7abd221a55a61b6b2bf0e80f850bfc0ae75c7e01Affected 31a38a908c98aebc7a1104dab5f1ba199f234b7bAffected 04d748d4bd2d86739b159563f257e3dc5492c88dAffected 5.10.229 to before 5.10.241Affected 5.15.170 to before 5.15.190Affected 6.1.115 to before 6.1.149Affected 6.6.59 to before 6.6.103Affected 4.19.323 to before 4.20Affected 5.4.285 to before 5.5Affected 6.11.6 to before 6.12Affected
LinuxLinux	6.12Affected before 6.12Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.43 through 6.12.Not affected 6.15.11 through 6.15.Not affected 6.16.2 through 6.16.*Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

3eb6aa870057da9f1304db660f68b9c2eb7e856d to before 3ca41ab55d23a0aa71661a5a56a8f06c11db90dcAffected
b7a396f76ada277d049558db648389456458af65 to before 3467c4ebb334658c6fcf3eabb64a6e8b2135e010Affected
4faa6e3e66b3251eb4bf5761d2f3f0f14095aaca to before 4eff1e57a8ef98d70451b94e8437e458b27dd234Affected
62c85b9a0dd7471a362170323e1211ad98ff7b4b to before 2a70cbd1aef8b8be39992ab7b776ce1390091774Affected
4c262801ea60c518b5bebc22a09f5b78b3147da2 to before d036104947176d030bec64792d54e1b4f4c7f318Affected
4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 5276896e6923ebe8c68573779d784aaf7d987cceAffected
4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 4293f6c5ccf735b26afeb6825def14d830e0367bAffected
4c262801ea60c518b5bebc22a09f5b78b3147da2 to before 33caa208dba6fa639e8a92fd0c8320b652e5550cAffected
7abd221a55a61b6b2bf0e80f850bfc0ae75c7e01Affected
31a38a908c98aebc7a1104dab5f1ba199f234b7bAffected
04d748d4bd2d86739b159563f257e3dc5492c88dAffected
5.10.229 to before 5.10.241Affected
5.15.170 to before 5.15.190Affected
6.1.115 to before 6.1.149Affected
6.6.59 to before 6.6.103Affected
4.19.323 to before 4.20Affected
5.4.285 to before 5.5Affected
6.11.6 to before 6.12Affected

LinuxLinux

6.12Affected
before 6.12Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.43 through 6.12.*Not affected
6.15.11 through 6.15.*Not affected
6.16.2 through 6.16.*Not affected
6.17 and laterNot affected

References

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