CVE-2026-74619

Local service interruption via repeatable OverlayFS warning

Published Aug 22, 2026 · Updated Aug 22, 2026

Reachable assertion in the Linux kernel allows local users to flood logs or crash systems through cross-namespace OverlayFS setup. ovl_fill_super() applies a repeatable WARN_ON() when fsconfig(FSCONFIG_CMD_CREATE) completes an OverlayFS context created in a different user namespace. A local unprivileged user can pass the context file descriptor between ordinary namespaces; repetition taints the kernel and floods logs, while panic_on_warn=1 turns the warning into a system crash.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel allows local users to flood logs or crash systems through cross-namespace OverlayFS setup. ovl_fill_super() applies a repeatable WARN_ON() when fsconfig(FSCONFIG_CMD_CREATE) completes an OverlayFS context created in a different user namespace. A local unprivileged user can pass the context file descriptor between ordinary namespaces; repetition taints the kernel and floods logs, while panic_on_warn=1 turns the warning into a system crash.

The record

CVE
CVE-2026-74619
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <42d99fcd8006007e2f708bede6789f37f3910b30
  2. Affected versionversion=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <494346f2aab2489d379d43ff614aea447cf4e94d
  3. Affected versionversion=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <513478092966dc9818d96dd2b3ed613fd2f6e30e
  4. Affected versionversion=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <63981fc786daaa626cb14d9be1406f674d79f98f
  5. Affected versionversion=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <be161fa31e3e9cc828a3c1bd935edca461e8a7a1
  6. Affected versionversion=6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <42d99fcd8006007e2f708bede6789f37f3910b30; version=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <494346f2aab2489d379d43ff614aea447cf4e94d; version=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <513478092966dc9818d96dd2b3ed613fd2f6e30e; version=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <63981fc786daaa626cb14d9be1406f674d79f98f; version=1784fbc2ed9c888ea4e895f30a53207ed7ee8208 <be161fa31e3e9cc828a3c1bd935edca461e8a7a1; version=6.5

Published CVSS scores

5.5Red HatCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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