CVE-2026-93196High· 8.4▾ Twilight

In the Linux kernel, the following vulnerability has been resolved: nvdimm: virtio_pmem: refcount requests for token lifetime KASAN reports slab-use-after-free in __wake_up_common(): BUG: KASAN: slab-use-after-free in __wake_up_common+…

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score46/ 100 · Moderate

impact 46.2 · likelihood 0 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.

…

Published

Sep 17, 2026

Updated

Oct 3, 2026

CVSS

8.4

Vendor

Linux

Product

Linux

CWE

—

Depth score

46 · Moderate

EPSS

0.17% · p6

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Sep 18.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

6 events · 17 days

Sep 17, 2026Published
Disclosed via NVD
Sep 18, 2026EPSS first tracked
0.2%
Sep 18, 2026CVSS changed
— → 8.4
Sep 18, 2026Severity changed
none → high
Oct 3, 2026Record revised
Last analysed / modified upstream
Oct 4, 2026EPSS peak
0.2% → 0.2%

Linux #nvd #cve.org

Affected

Linux >= 6e84200c0a2994b991259d19450eee561029bf70 < 4691c137e9cbe76137d730a26d663d900ac7279b
Linux >= 6e84200c0a2994b991259d19450eee561029bf70 < be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491
Linux >= 6e84200c0a2994b991259d19450eee561029bf70 < b1e740b9156621afd4c4aa66257f4dde8df1febe
Linux >= 6e84200c0a2994b991259d19450eee561029bf70 < e57140944b5a47a7fd5a142faab29a02af040bc8
Linux 5.3

Full technical detail▾

Overview

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

nvdimm: virtio_pmem: refcount requests for token lifetime

KASAN reports slab-use-after-free in __wake_up_common(): BUG: KASAN: slab-use-after-free in __wake_up_common+0x114/0x160 Read of size 8 at addr ffff88810fdcb710 by task swapper/0/0

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.19.0-next-20260220-00006-g1eae5f204ec3 #4 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.17.0-2-2 04/01/2014 Call Trace: <IRQ> dump_stack_lvl+0x6d/0xb0 print_report+0x170/0x4e2 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 ? __virt_addr_valid+0x1dc/0x380 kasan_report+0xbc/0xf0 ? __wake_up_common+0x114/0x160 ? __wake_up_common+0x114/0x160 __wake_up_common+0x114/0x160 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 __wake_up+0x36/0x60 virtio_pmem_host_ack+0x11d/0x3b0 ? sched_balance_domains+0x29f/0xb00 ? __pfx_virtio_pmem_host_ack+0x10/0x10 ? _raw_spin_lock_irqsave+0x98/0x100 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 vring_interrupt+0x1c9/0x5e0 ? __pfx_vp_interrupt+0x10/0x10 vp_vring_interrupt+0x87/0x100 ? __pfx_vp_interrupt+0x10/0x10 __handle_irq_event_percpu+0x17f/0x550 ? __pfx__raw_spin_lock+0x10/0x10 handle_irq_event+0xab/0x1c0 handle_fasteoi_irq+0x276/0xae0 __common_interrupt+0x65/0x130 common_interrupt+0x78/0xa0 </IRQ>

virtio_pmem_host_ack() wakes a request that has already been freed by the submitter.

This happens when the request token is still reachable via the virtqueue, but virtio_pmem_flush() returns and frees it.

Fix the token lifetime by refcounting struct virtio_pmem_request. virtio_pmem_flush() holds a submitter reference, and the virtqueue holds an extra reference once the request is queued. The completion path drops the virtqueue reference, and the submitter drops its reference before returning.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Sep 18, 2026CVSS — → 8.4
Sep 18, 2026Severity none → high

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org