CVE-2026-93049Hinoki check available

Memory corruption via double-free during debugfs setup

Published Sep 17, 2026 · Updated Sep 17, 2026

Double-free in Linux mtdswap allows local users to corrupt kernel memory when debugfs setup fails after device registration. In mtdswap_add_mtd(), del_mtd_blktrans_dev() releases mbd_dev, but cleanup then passes the same pointer to kfree(). Reaching this path requires mtdswap initialization and a debugfs setup failure; the published assessment requires privileged local access, and no demonstrated exploitation outcome is disclosed.

CVSS severity4.7
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Double-free in Linux mtdswap allows local users to corrupt kernel memory when debugfs setup fails after device registration. In mtdswap_add_mtd(), del_mtd_blktrans_dev() releases mbd_dev, but cleanup then passes the same pointer to kfree(). Reaching this path requires mtdswap initialization and a debugfs setup failure; the published assessment requires privileged local access, and no demonstrated exploitation outcome is disclosed.

The record

CVE
CVE-2026-93049
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=4.14
  2. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
  3. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <37be7bc2c2d09c18e939da20224405864a0090b9
  4. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <5c349c533e72af2313c3be0f80a24d7407fa4777
  5. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <779aa4c66a96bf43d2d62982ea1a9096a9128d87
  6. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <a82d93fcfdfd26af17049c34319dfdd079cd1901
  7. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <d5086911d532b82ca070d944aa08ddde00baefe4
  8. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <ecadb9137aeaa0615183f8d23eabea2b45c862f1
  9. Affected versionversion=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <eec130fc9ffbbd08a5d5432683122b79aca2a726

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <0ce48c6ddea1a8e675a2eb0221b62a9950788f3c; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <37be7bc2c2d09c18e939da20224405864a0090b9; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <5c349c533e72af2313c3be0f80a24d7407fa4777; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <779aa4c66a96bf43d2d62982ea1a9096a9128d87; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <a82d93fcfdfd26af17049c34319dfdd079cd1901; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <d5086911d532b82ca070d944aa08ddde00baefe4; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <ecadb9137aeaa0615183f8d23eabea2b45c862f1; version=e8e3edb95ce6a146bc774b6cfad3553f4383edc8 <eec130fc9ffbbd08a5d5432683122b79aca2a726

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

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)
Vectorlocal
Privilegesadmin
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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