CVE-2026-72034

System panic via detached mount race

Published Aug 15, 2026 · Updated Aug 15, 2026

NULL pointer dereference in affected Linux kernel releases allows local users to panic the system through a detached mount race. capable_wrt_mount() assumes mount->mnt_ns remains non-NULL after may_decode_fh() checks it, but concurrent mount dissolution can clear the pointer before mnt_ns->user_ns is dereferenced. Exploitation requires local low-privileged access and winning the race between open_by_handle_at() and mount teardown; a successful trigger crashes the host.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel releases allows local users to panic the system through a detached mount race. capable_wrt_mount() assumes mount->mnt_ns remains non-NULL after may_decode_fh() checks it, but concurrent mount dissolution can clear the pointer before mnt_ns->user_ns is dereferenced. Exploitation requires local low-privileged access and winning the race between open_by_handle_at() and mount teardown; a successful trigger crashes the host.

The record

CVE
CVE-2026-72034
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.11
  2. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <15104234c267ebe04b9f9a73e5c2179cc265ff60
  3. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <6c52226072a3c61337b1eec1799bb987748884fa
  4. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <6c732471740bc2ac9b0946134f9f551dc75f4369
  5. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <6ee183d89261bf1d1cf9f06d80a40dab8f36ee55

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <15104234c267ebe04b9f9a73e5c2179cc265ff60; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <6c52226072a3c61337b1eec1799bb987748884fa; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <6c732471740bc2ac9b0946134f9f551dc75f4369; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <6ee183d89261bf1d1cf9f06d80a40dab8f36ee55

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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