Vulnerability-Lookup

CVE-2026-93196 (GCVE-0-2026-93196)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12

Title

nvdimm: virtio_pmem: refcount requests for token lifetime

Summary

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/be072a5d5e35f4bdf…
https://git.kernel.org/stable/c/b1e740b9156621afd…
https://git.kernel.org/stable/c/e57140944b5a47a7f…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 6e84200c0a2994b991259d19450eee561029bf70 , < be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491 (git) Affected: 6e84200c0a2994b991259d19450eee561029bf70 , < b1e740b9156621afd4c4aa66257f4dde8df1febe (git) Affected: 6e84200c0a2994b991259d19450eee561029bf70 , < e57140944b5a47a7fd5a142faab29a02af040bc8 (git)	guessed
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvdimm/nd_virtio.c",
            "drivers/nvdimm/virtio_pmem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            },
            {
              "lessThan": "b1e740b9156621afd4c4aa66257f4dde8df1febe",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            },
            {
              "lessThan": "e57140944b5a47a7fd5a142faab29a02af040bc8",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvdimm/nd_virtio.c",
            "drivers/nvdimm/virtio_pmem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm: virtio_pmem: refcount requests for token lifetime\n\nKASAN reports slab-use-after-free in __wake_up_common():\nBUG: KASAN: slab-use-after-free in __wake_up_common+0x114/0x160\nRead of size 8 at addr ffff88810fdcb710 by task swapper/0/0\n\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted\n6.19.0-next-20260220-00006-g1eae5f204ec3 #4 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux\n1.17.0-2-2 04/01/2014\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl+0x6d/0xb0\n print_report+0x170/0x4e2\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? __virt_addr_valid+0x1dc/0x380\n kasan_report+0xbc/0xf0\n ? __wake_up_common+0x114/0x160\n ? __wake_up_common+0x114/0x160\n __wake_up_common+0x114/0x160\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n __wake_up+0x36/0x60\n virtio_pmem_host_ack+0x11d/0x3b0\n ? sched_balance_domains+0x29f/0xb00\n ? __pfx_virtio_pmem_host_ack+0x10/0x10\n ? _raw_spin_lock_irqsave+0x98/0x100\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n vring_interrupt+0x1c9/0x5e0\n ? __pfx_vp_interrupt+0x10/0x10\n vp_vring_interrupt+0x87/0x100\n ? __pfx_vp_interrupt+0x10/0x10\n __handle_irq_event_percpu+0x17f/0x550\n ? __pfx__raw_spin_lock+0x10/0x10\n handle_irq_event+0xab/0x1c0\n handle_fasteoi_irq+0x276/0xae0\n __common_interrupt+0x65/0x130\n common_interrupt+0x78/0xa0\n \u003c/IRQ\u003e\n\nvirtio_pmem_host_ack() wakes a request that has already been freed by the\nsubmitter.\n\nThis happens when the request token is still reachable via the virtqueue,\nbut virtio_pmem_flush() returns and frees it.\n\nFix the token lifetime by refcounting struct virtio_pmem_request.\nvirtio_pmem_flush() holds a submitter reference, and the virtqueue holds an\nextra reference once the request is queued. The completion path drops the\nvirtqueue reference, and the submitter drops its reference before\nreturning."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:12:19.125Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe"
        },
        {
          "url": "https://git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8"
        }
      ],
      "title": "nvdimm: virtio_pmem: refcount requests for token lifetime",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93196",
    "datePublished": "2026-09-17T16:12:19.125Z",
    "dateReserved": "2026-09-17T16:02:15.092Z",
    "dateUpdated": "2026-09-17T16:12:19.125Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-93196\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-17T17:18:15.880\",\"lastModified\":\"2026-09-17T17:18:15.880\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvdimm: virtio_pmem: refcount requests for token lifetime\\n\\nKASAN reports slab-use-after-free in __wake_up_common():\\nBUG: KASAN: slab-use-after-free in __wake_up_common+0x114/0x160\\nRead of size 8 at addr ffff88810fdcb710 by task swapper/0/0\\n\\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted\\n6.19.0-next-20260220-00006-g1eae5f204ec3 #4 PREEMPT(full)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux\\n1.17.0-2-2 04/01/2014\\nCall Trace:\\n \u003cIRQ\u003e\\n dump_stack_lvl+0x6d/0xb0\\n print_report+0x170/0x4e2\\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n ? __virt_addr_valid+0x1dc/0x380\\n kasan_report+0xbc/0xf0\\n ? __wake_up_common+0x114/0x160\\n ? __wake_up_common+0x114/0x160\\n __wake_up_common+0x114/0x160\\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n __wake_up+0x36/0x60\\n virtio_pmem_host_ack+0x11d/0x3b0\\n ? sched_balance_domains+0x29f/0xb00\\n ? __pfx_virtio_pmem_host_ack+0x10/0x10\\n ? _raw_spin_lock_irqsave+0x98/0x100\\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n vring_interrupt+0x1c9/0x5e0\\n ? __pfx_vp_interrupt+0x10/0x10\\n vp_vring_interrupt+0x87/0x100\\n ? __pfx_vp_interrupt+0x10/0x10\\n __handle_irq_event_percpu+0x17f/0x550\\n ? __pfx__raw_spin_lock+0x10/0x10\\n handle_irq_event+0xab/0x1c0\\n handle_fasteoi_irq+0x276/0xae0\\n __common_interrupt+0x65/0x130\\n common_interrupt+0x78/0xa0\\n \u003c/IRQ\u003e\\n\\nvirtio_pmem_host_ack() wakes a request that has already been freed by the\\nsubmitter.\\n\\nThis happens when the request token is still reachable via the virtqueue,\\nbut virtio_pmem_flush() returns and frees it.\\n\\nFix the token lifetime by refcounting struct virtio_pmem_request.\\nvirtio_pmem_flush() holds a submitter reference, and the virtqueue holds an\\nextra reference once the request is queued. The completion path drops the\\nvirtqueue reference, and the submitter drops its reference before\\nreturning.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nvdimm/nd_virtio.c\",\"drivers/nvdimm/virtio_pmem.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6e84200c0a2994b991259d19450eee561029bf70\",\"lessThan\":\"be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e84200c0a2994b991259d19450eee561029bf70\",\"lessThan\":\"b1e740b9156621afd4c4aa66257f4dde8df1febe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e84200c0a2994b991259d19450eee561029bf70\",\"lessThan\":\"e57140944b5a47a7fd5a142faab29a02af040bc8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nvdimm/nd_virtio.c\",\"drivers/nvdimm/virtio_pmem.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:10:51Z",
      "cve": "CVE-2026-93196",
      "id": "CVE-2026-93196",
      "initial_release_date": "2026-09-18T00:10:51Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93196",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93196.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-93196

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvdimm/nd_virtio.c",
            "drivers/nvdimm/virtio_pmem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            },
            {
              "lessThan": "b1e740b9156621afd4c4aa66257f4dde8df1febe",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            },
            {
              "lessThan": "e57140944b5a47a7fd5a142faab29a02af040bc8",
              "status": "affected",
              "version": "6e84200c0a2994b991259d19450eee561029bf70",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvdimm/nd_virtio.c",
            "drivers/nvdimm/virtio_pmem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm: virtio_pmem: refcount requests for token lifetime\n\nKASAN reports slab-use-after-free in __wake_up_common():\nBUG: KASAN: slab-use-after-free in __wake_up_common+0x114/0x160\nRead of size 8 at addr ffff88810fdcb710 by task swapper/0/0\n\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted\n6.19.0-next-20260220-00006-g1eae5f204ec3 #4 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux\n1.17.0-2-2 04/01/2014\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl+0x6d/0xb0\n print_report+0x170/0x4e2\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? __virt_addr_valid+0x1dc/0x380\n kasan_report+0xbc/0xf0\n ? __wake_up_common+0x114/0x160\n ? __wake_up_common+0x114/0x160\n __wake_up_common+0x114/0x160\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n __wake_up+0x36/0x60\n virtio_pmem_host_ack+0x11d/0x3b0\n ? sched_balance_domains+0x29f/0xb00\n ? __pfx_virtio_pmem_host_ack+0x10/0x10\n ? _raw_spin_lock_irqsave+0x98/0x100\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n vring_interrupt+0x1c9/0x5e0\n ? __pfx_vp_interrupt+0x10/0x10\n vp_vring_interrupt+0x87/0x100\n ? __pfx_vp_interrupt+0x10/0x10\n __handle_irq_event_percpu+0x17f/0x550\n ? __pfx__raw_spin_lock+0x10/0x10\n handle_irq_event+0xab/0x1c0\n handle_fasteoi_irq+0x276/0xae0\n __common_interrupt+0x65/0x130\n common_interrupt+0x78/0xa0\n \u003c/IRQ\u003e\n\nvirtio_pmem_host_ack() wakes a request that has already been freed by the\nsubmitter.\n\nThis happens when the request token is still reachable via the virtqueue,\nbut virtio_pmem_flush() returns and frees it.\n\nFix the token lifetime by refcounting struct virtio_pmem_request.\nvirtio_pmem_flush() holds a submitter reference, and the virtqueue holds an\nextra reference once the request is queued. The completion path drops the\nvirtqueue reference, and the submitter drops its reference before\nreturning."
    }
  ],
  "id": "CVE-2026-93196",
  "lastModified": "2026-09-17T17:18:15.880",
  "metrics": {},
  "published": "2026-09-17T17:18:15.880",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-8M98-GQRC-3MR3

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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: 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

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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{
  "affected": [],
  "aliases": [
    "CVE-2026-93196"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm: virtio_pmem: refcount requests for token lifetime\n\nKASAN reports slab-use-after-free in __wake_up_common():\nBUG: KASAN: slab-use-after-free in __wake_up_common+0x114/0x160\nRead of size 8 at addr ffff88810fdcb710 by task swapper/0/0\n\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted\n6.19.0-next-20260220-00006-g1eae5f204ec3 #4 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux\n1.17.0-2-2 04/01/2014\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl+0x6d/0xb0\n print_report+0x170/0x4e2\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? __virt_addr_valid+0x1dc/0x380\n kasan_report+0xbc/0xf0\n ? __wake_up_common+0x114/0x160\n ? __wake_up_common+0x114/0x160\n __wake_up_common+0x114/0x160\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n __wake_up+0x36/0x60\n virtio_pmem_host_ack+0x11d/0x3b0\n ? sched_balance_domains+0x29f/0xb00\n ? __pfx_virtio_pmem_host_ack+0x10/0x10\n ? _raw_spin_lock_irqsave+0x98/0x100\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n vring_interrupt+0x1c9/0x5e0\n ? __pfx_vp_interrupt+0x10/0x10\n vp_vring_interrupt+0x87/0x100\n ? __pfx_vp_interrupt+0x10/0x10\n __handle_irq_event_percpu+0x17f/0x550\n ? __pfx__raw_spin_lock+0x10/0x10\n handle_irq_event+0xab/0x1c0\n handle_fasteoi_irq+0x276/0xae0\n __common_interrupt+0x65/0x130\n common_interrupt+0x78/0xa0\n \u003c/IRQ\u003e\n\nvirtio_pmem_host_ack() wakes a request that has already been freed by the\nsubmitter.\n\nThis happens when the request token is still reachable via the virtqueue,\nbut virtio_pmem_flush() returns and frees it.\n\nFix the token lifetime by refcounting struct virtio_pmem_request.\nvirtio_pmem_flush() holds a submitter reference, and the virtqueue holds an\nextra reference once the request is queued. The completion path drops the\nvirtqueue reference, and the submitter drops its reference before\nreturning.",
  "id": "GHSA-8m98-gqrc-3mr3",
  "modified": "2026-09-17T18:32:13Z",
  "published": "2026-09-17T18:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93196"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1e740b9156621afd4c4aa66257f4dde8df1febe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be072a5d5e35f4bdf2da22f600b5d6dc6c5ff491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e57140944b5a47a7fd5a142faab29a02af040bc8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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Action not permitted

CVE-2026-93196 (GCVE-0-2026-93196)

FKIE_CVE-2026-93196

GHSA-8M98-GQRC-3MR3

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