nvdimm: virtio_pmem: refcount requests for token lifetime
Summary
| CVE | CVE-2026-93196 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-17 17:18:15 UTC |
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| Updated | 2026-09-17 17:18:15 UTC |
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| 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 6e84200c0a2994b991259d19450eee561029bf70 be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491 git |
Not specified |
| CNA |
Linux |
Linux |
affected 6e84200c0a2994b991259d19450eee561029bf70 b1e740b9156621afd4c4aa66257f4dde8df1febe git |
Not specified |
| CNA |
Linux |
Linux |
affected 6e84200c0a2994b991259d19450eee561029bf70 e57140944b5a47a7fd5a142faab29a02af040bc8 git |
Not specified |
| CNA |
Linux |
Linux |
affected 5.3 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.3 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.52 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.6 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.