# CVE-2026-31601: vfio/xe: Reorganize the init to decouple migration from reset

CVE-2026-31601 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31601 (version 6.19.14-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-31601
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31601

## Description

In the Linux kernel, the following vulnerability has been resolved:  vfio/xe: Reorganize the init to decouple migration from reset  Attempting to issue reset on VF devices that don't support migration leads to the following:    BUG: unable to handle page fault for address: 00000000000011f8   #PF: supervisor read access in kernel mode   #PF: error_code(0x0000) - not-present page   PGD 0 P4D 0   Oops: Oops: 0000 [#1] SMP NOPTI   CPU: 2 UID: 0 PID: 7443 Comm: xe_sriov_flr Tainted: G S   U              7.0.0-rc1-lgci-xe-xe-4588-cec43d5c2696af219-nodebug+ #1 PREEMPT(lazy)   Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER   Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-P DDR4 RVP, BIOS RPLPFWI1.R00.4035.A00.2301200723 01/20/2023   RIP: 0010:xe_sriov_vfio_wait_flr_done+0xc/0x80 [xe]   Code: ff c3 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 41 54 53 <83> bf f8 11 00 00 02 75 61 41 89 f4 85 f6 74 52 48 8b 47 08 48 89   RSP: 0018:ffffc9000f7c39b8 EFLAGS: 00010202   RAX: ffffffffa04d8660 RBX: ffff88813e3e4000 RCX: 0000000000000000   RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000   RBP: ffffc9000f7c39c8 R08: 0000000000000000 R09: 0000000000000000   R10: 0000000000000000 R11: 0000000000000000 R12: ffff888101a48800   R13: ffff88813e3e4150 R14: ffff888130d0d008 R15: ffff88813e3e40d0   FS:  00007877d3d0d940(0000) GS:ffff88890b6d3000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 00000000000011f8 CR3: 000000015a762000 CR4: 0000000000f52ef0   PKRU: 55555554   Call Trace:    <TASK>    xe_vfio_pci_reset_done+0x49/0x120 [xe_vfio_pci]    pci_dev_restore+0x3b/0x80    pci_reset_function+0x109/0x140    reset_store+0x5c/0xb0    dev_attr_store+0x17/0x40    sysfs_kf_write+0x72/0x90    kernfs_fop_write_iter+0x161/0x1f0    vfs_write+0x261/0x440    ksys_write+0x69/0xf0    __x64_sys_write+0x19/0x30    x64_sys_call+0x259/0x26e0    do_syscall_64+0xcb/0x1500    ? __fput+0x1a2/0x2d0    ? fput_close_sync+0x3d/0xa0    ? __x64_sys_close+0x3e/0x90    ? x64_sys_call+0x1b7c/0x26e0    ? do_syscall_64+0x109/0x1500    ? __task_pid_nr_ns+0x68/0x100    ? __do_sys_getpid+0x1d/0x30    ? x64_sys_call+0x10b5/0x26e0    ? do_syscall_64+0x109/0x1500    ? putname+0x41/0x90    ? do_faccessat+0x1e8/0x300    ? __x64_sys_access+0x1c/0x30    ? x64_sys_call+0x1822/0x26e0    ? do_syscall_64+0x109/0x1500    ? tick_program_event+0x43/0xa0    ? hrtimer_interrupt+0x126/0x260    ? irqentry_exit+0xb2/0x710    entry_SYSCALL_64_after_hwframe+0x76/0x7e   RIP: 0033:0x7877d5f1c5a4   Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d a5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89   RSP: 002b:00007fff48e5f908 EFLAGS: 00000202 ORIG_RAX: 0000000000000001   RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007877d5f1c5a4   RDX: 0000000000000001 RSI: 00007877d621b0c9 RDI: 0000000000000009   RBP: 0000000000000001 R08: 00005fb49113b010 R09: 0000000000000007   R10: 0000000000000000 R11: 0000000000000202 R12: 00007877d621b0c9   R13: 0000000000000009 R14: 00007fff48e5fac0 R15: 00007fff48e5fac0    </TASK>  This is caused by the fact that some of the xe_vfio_pci_core_device members needed for handling reset are only initialized as part of migration init.  Fix the problem by reorganizing the code to decouple VF init from migration init.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-31601](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31601.md) | May 15, 2026 |

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