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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 0f19d54e2524f0bf183b82f365ae4e49b4a2f788, 1cd4e9b7967dab48c9f79a00b06ffff7208c0993, 2dd0298905e97795a9c5ec30cf5b41975f821632; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0f19d54e2524f0bf183b82f365ae4e49b4a2f788, 1cd4e9b7967dab48c9f79a00b06ffff7208c0993, 2dd0298905e97795a9c5ec30cf5b41975f821632; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: set have_execfd only once the interpreter is opened load_misc_binary() raises bprm->have_execfd as soon as it sees the 'O' (or 'C') flag. This happens well before it opens the interpreter. If that open fails the flag stays set on the bprm. binfmt_misc is at the head of the format list so an interpreter open failure that returns -ENOEXEC lets the search fall through to a later format. This means it runs the matched binary directly having never staged an interpreter. So bprm->executable is NULL while have_execfd falsely claims a descriptor is present. Consequently, begin_new_exec() dereferences the missing executable: would_dump(bprm, bprm->executable); and NULL derefs. Had it not, the hand-off later in the same function would have failed anyway. FD_ADD(0, bprm->executable) rejects a NULL file with -ENOMEM. Both sites are past the point of no return so the exec cannot be unwound either way. This can be reached by unprivileged users as binfmt_misc can be mounted in user namespaces. So a user can register an 'O' entry whose interpreter lives on a FUSE mount, have the FUSE server fail the open with -ENOEXEC and execute a native ELF file that matches the entry. have_execfd only means anything alongside the executable it describes which is not set until the interpreter has been opened and staged. So lets raise it there, next to execfd_creds, which is already set at that point. An open failure now leaves it clear, so the fallback format derives credentials from the binary and emits no AT_EXECFD, as it would for any native exec. The argv rewrite load_misc_binary() performs before the open is still not undone. This means the binary sees the interpreter path in argv[0] and its own path in argv[1] but that predates this change and only became observable once the exec stopped faulting.

—No exploit Fix available
Published
Aug 10, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.8affected
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before a8e9e9450df44e9dd529ec5beff283f48f4f4b97affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before a261dc49d99681c9c71f38d16e31812dc3e30412affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before 40c09b7a1d4e0a4866042c87c2bd911bb57566c8affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before 0f19d54e2524f0bf183b82f365ae4e49b4a2f788affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before 2dd0298905e97795a9c5ec30cf5b41975f821632affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before 1cd4e9b7967dab48c9f79a00b06ffff7208c0993affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before 5ccc99d58f94fad258c9c375715b3974e48620e8affected · git
    • bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 and later · before bbf5f639918dc011aaf60aab8480218758ee68c5affected · git
    • before 5.8not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68184Aug 10, 2026 · cdrom: fix stack out-of-bounds read in CDROMVOLCTRL
    0Monitor
  • ← EarlierCVE-2026-68185Aug 10, 2026 · LoongArch: Move jump_label_init() before parse_early_param()
    0Monitor
  • Later →CVE-2026-68187Aug 10, 2026 · exec: fix unsigned loop counter wrap in transfer_args_to_stack()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0f19d54e2524f0bf183b82f365ae4e49b4a2f788Vendor (CNA)
Linux Linux1cd4e9b7967dab48c9f79a00b06ffff7208c0993Vendor (CNA)
Linux Linux2dd0298905e97795a9c5ec30cf5b41975f821632Vendor (CNA)
Linux Linux40c09b7a1d4e0a4866042c87c2bd911bb57566c8Vendor (CNA)
Linux Linux5ccc99d58f94fad258c9c375715b3974e48620e8Vendor (CNA)
Linux Linuxa261dc49d99681c9c71f38d16e31812dc3e30412Vendor (CNA)
Linux Linuxa8e9e9450df44e9dd529ec5beff283f48f4f4b97Vendor (CNA)
Linux Linuxbbf5f639918dc011aaf60aab8480218758ee68c5Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records