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🛡️ CVE-2026-31695 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-31695 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.12)
  • linux-kernel

Timeline and source

Published on 1 May 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31695 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-01
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.12
linux-kernel — —

Similar Threats

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