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Linux Kernel CVE-2026-31695

| EUVD-2026-26504 HIGH
Use After Free (CWE-416)
2026-05-01 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Use After Free Memory Corruption Red Hat Suse
7.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

7
Analysis Generated
May 03, 2026 - 07:22 vuln.today
CVSS changed
May 03, 2026 - 07:22 NVD
7.8 (HIGH)
Patch released
May 03, 2026 - 07:16 nvd
Patch available
Patch available
May 01, 2026 - 15:02 EUVD
EUVD ID Assigned
May 01, 2026 - 14:22 euvd
EUVD-2026-26504
Analysis Generated
May 01, 2026 - 14:22 vuln.today
CVE Published
May 01, 2026 - 14:16 nvd
HIGH 7.8

DescriptionNVD

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

wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

Currently we execute SET_NETDEV_DEV(dev, &priv->lowerdev->dev) for the virt_wifi net devices. However, unregistering a virt_wifi device in netdev_run_todo() can happen together with the device referenced by SET_NETDEV_DEV().

It can result in use-after-free during the ethtool operations performed on a virt_wifi device that is currently being unregistered. Such a net device can have the dev.parent field pointing to the freed memory, but ethnl_ops_begin() calls pm_runtime_get_sync(dev->dev.parent).

Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this:

============== BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0 Read of size 2 at addr ffff88810cfc46f8 by task pm/606

Call Trace: <TASK> dump_stack_lvl+0x4d/0x70 print_report+0x170/0x4f3 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 kasan_report+0xda/0x110 ? __pm_runtime_resume+0xe2/0xf0 ? __pm_runtime_resume+0xe2/0xf0 __pm_runtime_resume+0xe2/0xf0 ethnl_ops_begin+0x49/0x270 ethnl_set_features+0x23c/0xab0 ? __pfx_ethnl_set_features+0x10/0x10 ? kvm_sched_clock_read+0x11/0x20 ? local_clock_noinstr+0xf/0xf0 ? local_clock+0x10/0x30 ? kasan_save_track+0x25/0x60 ? __kasan_kmalloc+0x7f/0x90 ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0 genl_family_rcv_msg_doit+0x1e7/0x2c0 ? __pfx_genl_family_rcv_msg_doit+0x10/0x10 ? __pfx_cred_has_capability.isra.0+0x10/0x10 ? stack_trace_save+0x8e/0xc0 genl_rcv_msg+0x411/0x660 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_ethnl_set_features+0x10/0x10 netlink_rcv_skb+0x121/0x380 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_netlink_rcv_skb+0x10/0x10 ? __pfx_down_read+0x10/0x10 genl_rcv+0x23/0x30 netlink_unicast+0x60f/0x830 ? __pfx_netlink_unicast+0x10/0x10 ? __pfx___alloc_skb+0x10/0x10 netlink_sendmsg+0x6ea/0xbc0 ? __pfx_netlink_sendmsg+0x10/0x10 ? __futex_queue+0x10b/0x1f0 ____sys_sendmsg+0x7a2/0x950 ? copy_msghdr_from_user+0x26b/0x430 ? __pfx_____sys_sendmsg+0x10/0x10 ? __pfx_copy_msghdr_from_user+0x10/0x10 ___sys_sendmsg+0xf8/0x180 ? __pfx____sys_sendmsg+0x10/0x10 ? __pfx_futex_wait+0x10/0x10 ? fdget+0x2e4/0x4a0 __sys_sendmsg+0x11f/0x1c0 ? __pfx___sys_sendmsg+0x10/0x10 do_syscall_64+0xe2/0x570 ? exc_page_fault+0x66/0xb0 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK>

This fix may be combined with another one in the ethtool subsystem: https://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u

AnalysisAI

Use-after-free in Linux kernel virt_wifi driver allows local authenticated users to trigger memory corruption during ethtool operations on virtual WiFi devices being unregistered. The vulnerability stems from improper device parent reference handling via SET_NETDEV_DEV, where ethnl_ops_begin() calls pm_runtime_get_sync() on already-freed memory when a virt_wifi device unregisters concurrently with ethtool operations. …

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RemediationAI

Within 24 hours: Identify systems running vulnerable Linux kernel versions (5.15.x, 6.1.x, 6.6.x, 6.12.x, 6.18.x, 6.19.x, 7.0.x) via inventory or patch management tools and assess virt_wifi device usage. Within 7 days: Apply vendor-released patches to move to patched versions (5.15.203 or later, 6.1.168 or later, 6.6.134 or later, 6.12.81 or later, 6.18.22 or later, 6.19.12 or later, 7.0 or later) and schedule controlled kernel updates. …

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CVE-2026-31695 vulnerability details – vuln.today
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