CVE-2026-93827

Kernel memory corruption via double-free during probe cleanup

Published Sep 24, 2026 · Updated Sep 24, 2026

A double-free in the Linux kernel virtio-fs driver allows attackers controlling a virtio-fs device to corrupt kernel memory during probe cleanup. The virtio_fs_setup_vqs() failure path frees fs->vqs and fs->mq_map but leaves both pointers live, so virtio_fs_ktype_release() frees them again. Triggering it requires a guest to probe a broken device that advertises more request queues than its transport provides.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double-free in the Linux kernel virtio-fs driver allows attackers controlling a virtio-fs device to corrupt kernel memory during probe cleanup. The virtio_fs_setup_vqs() failure path frees fs->vqs and fs->mq_map but leaves both pointers live, so virtio_fs_ktype_release() frees them again. Triggering it requires a guest to probe a broken device that advertises more request queues than its transport provides.

The record

CVE
CVE-2026-93827
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.12.111
  2. Affected versionversion=0 <6.18.53
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20ef4739b329bb09cff11dd2458795a50674658e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6af3330ec5d5fb8c06c04eb520a71cf73ea5a765

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.12.111; version=0 <6.18.53; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20ef4739b329bb09cff11dd2458795a50674658e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6af3330ec5d5fb8c06c04eb520a71cf73ea5a765

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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