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.
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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
|
||||||||||||||||||
| Linux | Linux | affected |
|
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Fixes
Solution
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Workaround
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References
History
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | nvdimm: virtio_pmem: refcount requests for token lifetime | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:12:19.125Z
Reserved: 2026-09-17T16:02:15.092Z
Link: CVE-2026-93196
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:18:15.880
Modified: 2026-09-17T17:18:15.880
Link: CVE-2026-93196
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.