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Message-ID: <2025090446-CVE-2025-38683-573c@gregkh> Date: Thu, 4 Sep 2025 17:32:48 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38683: hv_netvsc: Fix panic during namespace deletion with VF From: Greg Kroah-Hartman <gregkh@...nel.org> 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. The Linux kernel CVE team has assigned CVE-2025-38683 to this issue. Affected and fixed versions =========================== Issue introduced in 5.10.229 with commit 3eb6aa870057da9f1304db660f68b9c2eb7e856d and fixed in 5.10.241 with commit 3ca41ab55d23a0aa71661a5a56a8f06c11db90dc Issue introduced in 5.15.170 with commit b7a396f76ada277d049558db648389456458af65 and fixed in 5.15.190 with commit 3467c4ebb334658c6fcf3eabb64a6e8b2135e010 Issue introduced in 6.1.115 with commit 4faa6e3e66b3251eb4bf5761d2f3f0f14095aaca and fixed in 6.1.149 with commit 4eff1e57a8ef98d70451b94e8437e458b27dd234 Issue introduced in 6.6.59 with commit 62c85b9a0dd7471a362170323e1211ad98ff7b4b and fixed in 6.6.103 with commit 2a70cbd1aef8b8be39992ab7b776ce1390091774 Issue introduced in 6.12 with commit 4c262801ea60c518b5bebc22a09f5b78b3147da2 and fixed in 6.12.43 with commit d036104947176d030bec64792d54e1b4f4c7f318 Issue introduced in 6.12 with commit 4c262801ea60c518b5bebc22a09f5b78b3147da2 and fixed in 6.15.11 with commit 5276896e6923ebe8c68573779d784aaf7d987cce Issue introduced in 6.12 with commit 4c262801ea60c518b5bebc22a09f5b78b3147da2 and fixed in 6.16.2 with commit 4293f6c5ccf735b26afeb6825def14d830e0367b Issue introduced in 6.12 with commit 4c262801ea60c518b5bebc22a09f5b78b3147da2 and fixed in 6.17-rc2 with commit 33caa208dba6fa639e8a92fd0c8320b652e5550c Issue introduced in 4.19.323 with commit 7abd221a55a61b6b2bf0e80f850bfc0ae75c7e01 Issue introduced in 5.4.285 with commit 31a38a908c98aebc7a1104dab5f1ba199f234b7b Issue introduced in 6.11.6 with commit 04d748d4bd2d86739b159563f257e3dc5492c88d Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-38683 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/hyperv/hyperv_net.h drivers/net/hyperv/netvsc_drv.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/3ca41ab55d23a0aa71661a5a56a8f06c11db90dc https://git.kernel.org/stable/c/3467c4ebb334658c6fcf3eabb64a6e8b2135e010 https://git.kernel.org/stable/c/4eff1e57a8ef98d70451b94e8437e458b27dd234 https://git.kernel.org/stable/c/2a70cbd1aef8b8be39992ab7b776ce1390091774 https://git.kernel.org/stable/c/d036104947176d030bec64792d54e1b4f4c7f318 https://git.kernel.org/stable/c/5276896e6923ebe8c68573779d784aaf7d987cce https://git.kernel.org/stable/c/4293f6c5ccf735b26afeb6825def14d830e0367b https://git.kernel.org/stable/c/33caa208dba6fa639e8a92fd0c8320b652e5550c
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