CVE-2026-93054

Kernel memory compromise via raced UIO teardown

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in affected Linux UIO core releases allows local users to read or modify kernel memory through a raced device open. After device_add() exposes /dev/uioX, __uio_register_device() can fail without clearing idev->info, so later file operations dereference a caller-freed uio_info structure. A low-privileged account must access the UIO node and win a high-complexity race during a later setup failure; successful abuse can crash the kernel or compromise kernel memory.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux UIO core releases allows local users to read or modify kernel memory through a raced device open. After device_add() exposes /dev/uioX, __uio_register_device() can fail without clearing idev->info, so later file operations dereference a caller-freed uio_info structure. A low-privileged account must access the UIO node and win a high-complexity race during a later setup failure; successful abuse can crash the kernel or compromise kernel memory.

The record

CVE
CVE-2026-93054
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=085d735c858934e5d5bfaedb1fc98bd9135e6ff1
  2. Affected versionversion=4.14.100 <4.15
  3. Affected versionversion=4.18
  4. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <15340b00e665af805523b08515294a1aa1778151
  5. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <16695e9059d80ea6661e8399064b0c01f641dd8c
  6. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac
  7. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <506b43dde5f9ac0068b1360e6b5dbee07fda59fb
  8. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <63eaa7663335d482a8825c231213e312cacea567
  9. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <67b6fc084b034a91c3ec7907a3fed89a2450f30b
  10. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <df4faf65194ec6c315a59be4c6749eaeb3009243
  11. Affected versionversion=a93e7b331568227500186a465fee3c2cb5dffd1f <ec5bd6731183eb6f619140c9bef2ee11ed818c20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=085d735c858934e5d5bfaedb1fc98bd9135e6ff1; version=4.14.100 <4.15; version=4.18; version=a93e7b331568227500186a465fee3c2cb5dffd1f <15340b00e665af805523b08515294a1aa1778151; version=a93e7b331568227500186a465fee3c2cb5dffd1f <16695e9059d80ea6661e8399064b0c01f641dd8c; version=a93e7b331568227500186a465fee3c2cb5dffd1f <234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac; version=a93e7b331568227500186a465fee3c2cb5dffd1f <506b43dde5f9ac0068b1360e6b5dbee07fda59fb; version=a93e7b331568227500186a465fee3c2cb5dffd1f <63eaa7663335d482a8825c231213e312cacea567; version=a93e7b331568227500186a465fee3c2cb5dffd1f <67b6fc084b034a91c3ec7907a3fed89a2450f30b; version=a93e7b331568227500186a465fee3c2cb5dffd1f <df4faf65194ec6c315a59be4c6749eaeb3009243; version=a93e7b331568227500186a465fee3c2cb5dffd1f <ec5bd6731183eb6f619140c9bef2ee11ed818c20

Published CVSS scores

7.0Linux CNACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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