Vulnerability-Lookup

GHSA-M274-MG38-F4WJ

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74313"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:31Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-m274-mg38-f4wj",
  "modified": "2026-08-17T06:33:37Z",
  "published": "2026-08-15T06:32:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74313"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35483c5306e09b3190ff937089d404a78012695c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c1560be8aa6849356455af67518d35c551cbd95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79e12c891940b0c4c75881b7fd82a8cbb8ac97be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93ed4692f2299a40346025979f40e4a9b7b33af7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d94e2947203aead590fd63f667d316d4475d65af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45

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

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/35483c5306e09b319…
https://git.kernel.org/stable/c/5c1560be8aa684935…
https://git.kernel.org/stable/c/93ed4692f2299a403…
https://git.kernel.org/stable/c/d94e2947203aead59…
https://git.kernel.org/stable/c/a2d0a57538fd0b3b3…
https://git.kernel.org/stable/c/79e12c891940b0c4c…
https://git.kernel.org/stable/c/e440e077748939839…

Impacted products

2 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)
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)

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{
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/vdpa_user/vduse_dev.c"
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              "versionType": "semver"
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              "versionType": "semver"
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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."
        }
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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"
          },
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              "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."
            }
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        "dateUpdated": "2026-08-17T05:45:46.036Z",
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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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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "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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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-M274-MG38-F4WJ

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

Tags

Sightings

Nomenclature