CVE-2025-21883: ice: Fix deinitializing VF in error path
First published: Thu Mar 27 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ice: Fix deinitializing VF in error path If ice_ena_vfs() fails after calling ice_create_vf_entries(), it frees all VFs without removing them from snapshot PF-VF mailbox list, leading to list corruption. Reproducer: devlink dev eswitch set $PF1_PCI mode switchdev ip l s $PF1 up ip l s $PF1 promisc on sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs Trace (minimized): list_add corruption. next->prev should be prev (ffff8882e241c6f0), but was 0000000000000000. (next=ffff888455da1330). kernel BUG at lib/list_debug.c:29! RIP: 0010:__list_add_valid_or_report+0xa6/0x100 ice_mbx_init_vf_info+0xa7/0x180 [ice] ice_initialize_vf_entry+0x1fa/0x250 [ice] ice_sriov_configure+0x8d7/0x1520 [ice] ? __percpu_ref_switch_mode+0x1b1/0x5d0 ? __pfx_ice_sriov_configure+0x10/0x10 [ice] Sometimes a KASAN report can be seen instead with a similar stack trace: BUG: KASAN: use-after-free in __list_add_valid_or_report+0xf1/0x100 VFs are added to this list in ice_mbx_init_vf_info(), but only removed in ice_free_vfs(). Move the removing to ice_free_vf_entries(), which is also being called in other places where VFs are being removed (including ice_free_vfs() itself).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Frequently Asked Questions
What is the severity of CVE-2025-21883?
CVE-2025-21883 has a moderate severity level due to its potential for disrupting virtual function operations in the Linux kernel.
How do I fix CVE-2025-21883?
Fix CVE-2025-21883 by updating the Linux kernel to the latest version that contains the patch for this vulnerability.
What components are affected by CVE-2025-21883?
CVE-2025-21883 affects the ice driver in the Linux kernel, particularly in configurations utilizing virtual functions.
Is exploitation of CVE-2025-21883 easy?
Exploitation of CVE-2025-21883 requires a specific setup and occurs in scenarios where errors are mishandled during virtual function initialization.
What are the consequences of CVE-2025-21883 if exploited?
If CVE-2025-21883 is exploited, it could lead to system instability and possible data corruption due to list corruption in the PF-VF mailbox.
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