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NVD / CVE Program· CNA Linux

CVE-2026-74487: binfmt_misc: restore write access when removing an entry

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 13efc628fdf641d901bdba07caa1c558e1bed046, 3b522487a3a9162b1b519eefde7998d103e3e07b, 7873f987213695e3564c8c259e6db283e4739472; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 13efc628fdf641d901bdba07caa1c558e1bed046, 3b522487a3a9162b1b519eefde7998d103e3e07b, 7873f987213695e3564c8c259e6db283e4739472; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: restore write access when removing an entry Registering an entry with the MISC_FMT_OPEN_FILE flag opens the interpreter via open_exec() which denies write access to it for as long as the entry exists. Removing the entry closes the interpreter file via filp_close() but never restores write access, leaving the inode's i_writecount permanently negative. Opening the interpreter for writing keeps failing with ETXTBSY long after the entry is gone until the inode is evicted from the inode cache. Commit 90f601b497d7 ("binfmt_misc: restore write access before closing files opened by open_exec()") fixed the same imbalance in the error path of bm_register_write() but the actual removal path has been leaking the write denial since the introduction of the flag. Restore write access in put_binfmt_handler() before closing the interpreter file.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 23, 2026
EPSS
0.1% · 7th 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 · 0.1%

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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

    • 4.8affected
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before 7873f987213695e3564c8c259e6db283e4739472affected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before 13efc628fdf641d901bdba07caa1c558e1bed046affected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before f1cf67f6be0babc73afa4ee0e27bdedffeeeb095affected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3caffected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8affected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before fdc1d702bf3001586221fa07e598e876a0a854c5affected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before 3b522487a3a9162b1b519eefde7998d103e3e07baffected · git
    • 948b701a607f123df92ed29084413e5dd8cda2ed and later · before db1856ea9196cf6e015d12199a34c0b9313c7bfaaffected · git
    • before 4.8not 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 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

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-2026-74484Aug 15, 2026 · binfmt_misc: don't let an 'F' entry pin its own instance
    0Monitor
  • ← EarlierCVE-2026-74486Aug 15, 2026 · binfmt_misc: use exe_file_deny_write_access() for the interpreter clone
    0Monitor
  • Later →CVE-2026-74491Aug 15, 2026 · of/address: Fix NULL bus dereference in of_pci_range_parser_one()
    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 Linux13efc628fdf641d901bdba07caa1c558e1bed046Vendor (CNA)
Linux Linux3b522487a3a9162b1b519eefde7998d103e3e07bVendor (CNA)
Linux Linux7873f987213695e3564c8c259e6db283e4739472Vendor (CNA)
Linux Linuxa50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8Vendor (CNA)
Linux Linuxdb1856ea9196cf6e015d12199a34c0b9313c7bfaVendor (CNA)
Linux Linuxdd9ba32169e73a3c3ba595cf1de1f4c69ceafb3cVendor (CNA)
Linux Linuxf1cf67f6be0babc73afa4ee0e27bdedffeeeb095Vendor (CNA)
Linux Linuxfdc1d702bf3001586221fa07e598e876a0a854c5Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~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. Fix✗ → ✓

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References

Show all references (7 more)

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

All records