CVE-2026-74313 (GCVE-0-2026-74313)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45
VLAI
Title
vduse: hold vduse_lock across IDR lookup in open path
Summary
In the Linux kernel, the following vulnerability has been resolved: vduse: hold vduse_lock across IDR lookup in open path vduse_dev_open() looks up struct vduse_dev through the IDR and then acquires dev->lock only after vduse_lock has been dropped. This leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the same object from the IDR and free it before the open path locks the device, leading to a use-after-free. Close this race by keeping vduse_lock held until dev->lock has been acquired in the open path, matching the lock ordering already used by the destroy path.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < 35483c5306e09b3190ff937089d404a78012695c (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < 5c1560be8aa6849356455af67518d35c551cbd95 (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < 93ed4692f2299a40346025979f40e4a9b7b33af7 (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < d94e2947203aead590fd63f667d316d4475d65af (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2 (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < 79e12c891940b0c4c75881b7fd82a8cbb8ac97be (git)
Affected: c8a6153b6c59d95c0e091f053f6f180952ade91e , < e440e077748939839d9f76e24383b76b785f80ce (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: hold vduse_lock across IDR lookup in open path\n\nvduse_dev_open() looks up struct vduse_dev through the IDR and then\nacquires dev-\u003elock only after vduse_lock has been dropped.\n\nThis leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the\nsame object from the IDR and free it before the open path locks the\ndevice, leading to a use-after-free.\n\nClose this race by keeping vduse_lock held until dev-\u003elock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The vulnerability is only reachable via local syscalls on VDUSE character devices: open(2) on /dev/vduse/$NAME racing with ioctl(VDUSE_DESTROY_DEV) on /dev/vduse/control. It is not triggered by remote network traffic, adjacent wireless protocols, or physical device attachment.\nAC:L - The attacker fully controls both sides of the race by creating a VDUSE device, then concurrently calling open() and VDUSE_DESTROY_DEV from their own threads. No timing or layout conditions outside attacker control are required beyond standard thread scheduling.\nPR:L - Neither the open nor destroy paths enforce capabilities beyond device-node access; only VIRTIO_ID_NET creation requires CAP_NET_ADMIN. VDUSE is designed so userspace dataplane operators with access to /dev/vduse nodes can create, open, and destroy block devices without full host admin rights.\nUI:N - Exploitation requires no victim interaction. The attacker creates their own VDUSE instance and triggers the open/destroy race from their process; no separate user must mount, configure, or open the device.\nS:C - On cloud and virtualization hosts where VDUSE is delegated to containers or NFV tenant workloads, kernel UAF exploitation crosses from the tenant/container security boundary to full host kernel compromise, comparable to a VM or sandbox escape.\nC:H - The race produces a use-after-free of kmalloc\u0027d struct vduse_dev. Locking and dereferencing the freed object, plus subsequent ioctl/read/write using dangling file-\u003eprivate_data, enables slab reuse and arbitrary kernel memory disclosure.\nI:H - UAF of vduse_dev allows heap grooming over mutexes, virtqueue pointers, and config buffers. Follow-on VDUSE ioctls (SET_CONFIG, VQ_SETUP, IOTLB) on the dangling fd provide exploitable arbitrary-write and control-flow hijack primitives.\nA:H - Use-after-free during mutex_lock on the freed device or later VDUSE operations can immediately corrupt kernel memory and trigger oops/panic, fully denying system availability even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:46.036Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
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        {
          "url": "https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce"
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      "title": "vduse: hold vduse_lock across IDR lookup in open path",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74313",
    "datePublished": "2026-08-15T05:58:12.058Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:45:46.036Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: hold vduse_lock across IDR lookup in open path\n\nvduse_dev_open() looks up struct vduse_dev through the IDR and then\nacquires dev-\u003elock only after vduse_lock has been dropped.\n\nThis leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the\nsame object from the IDR and free it before the open path locks the\ndevice, leading to a use-after-free.\n\nClose this race by keeping vduse_lock held until dev-\u003elock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path."
          }
        ],
        "id": "CVE-2026-74313",
        "lastModified": "2026-08-17T06:19:25.603",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
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              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:22:31.460",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T16:57:53+00:00",
      "cve": "CVE-2026-74313",
      "id": "CVE-2026-74313",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vduse: hold vduse_lock across IDR lookup in open path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74313.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-03T00:26:16Z",
      "cve": "CVE-2026-74313",
      "id": "CVE-2026-74313",
      "initial_release_date": "2026-08-27T00:22:46Z",
      "product_status:known_affected": "179",
      "product_status:known_not_affected": "185",
      "product_status:recommended": "145",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74313",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74313.json",
      "version": "6"
    }
  }
}



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