Skip to main content
VulnerabilityPublished Updated

CVE-2026-68186: Linux kernel · binfmt_misc: set have_execfd only once the interpreter is opened

Affects Linux kernelSource CVE Database V5

0
Compare

Not known to be exploited · fixed in bbf5f639918dc011aaf60aab8480218758ee68c5 : patch Linux kernel soon.

Data as of 6 Nov 2026, 17:19 UTC

Severity
High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in bbf5f639918dc011aaf60aab8480218758ee68c5, a261dc49d99681c9c71f38d16e31812dc3e30412, a8e9e9450df44e9dd529ec5beff283f48f4f4b97 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < bbf5f639918dc011aaf60aab8480218758ee68c5
Fixed in
  • bbf5f639918dc011aaf60aab8480218758ee68c5
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < a261dc49d99681c9c71f38d16e31812dc3e30412
Fixed in
  • a261dc49d99681c9c71f38d16e31812dc3e30412
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < a8e9e9450df44e9dd529ec5beff283f48f4f4b97
Fixed in
  • a8e9e9450df44e9dd529ec5beff283f48f4f4b97
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < 40c09b7a1d4e0a4866042c87c2bd911bb57566c8
Fixed in
  • 40c09b7a1d4e0a4866042c87c2bd911bb57566c8
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < 5ccc99d58f94fad258c9c375715b3974e48620e8
Fixed in
  • 5ccc99d58f94fad258c9c375715b3974e48620e8
LinuxLinuxAffected
  • ≥ bc2bf338d54b7aadaed49bb45b9e10d4592b2a46, < 2dd0298905e97795a9c5ec30cf5b41975f821632
Fixed in
  • 2dd0298905e97795a9c5ec30cf5b41975f821632

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in multiple Linux kernel commits. Users should update their Linux kernel to a version including these fixes to remediate the issue. No additional mitigation is required if the system is updated.

Description

A vulnerability in the Linux kernel's binfmt_misc subsystem allows unprivileged users to cause a NULL pointer dereference during binary execution. This occurs because the have_execfd flag is set prematurely before the interpreter is successfully opened, leading to inconsistent state and a crash in begin_new_exec(). The flaw can be triggered by mounting binfmt_misc in user namespaces and registering a crafted 'O' entry with an interpreter on a FUSE mount that fails to open. The issue is fixed in several Linux kernel commits.

References

Community reviews

Loading reviews…