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NVD / CVE Program· CNA Linux

CVE-2025-40364: io_uring: fix io_req_prep_async with provided buffers

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.28% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 233b210a678bddf8b49b02a070074a52b87e6d43, 35ae7910c349fb3c60439992e2e0e79061e95382, a1b17713b32c75a90132ea2f92b1257f3bbc20f3.

Low priority for now. Upgrade to Linux Linux 233b210a678bddf8b49b02a070074a52b87e6d43, 35ae7910c349fb3c60439992e2e0e79061e95382, a1b17713b32c75a90132ea2f92b1257f3bbc20f3 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: io_uring: fix io_req_prep_async with provided buffers io_req_prep_async() can import provided buffers, commit the ring state by giving up on that before, it'll be reimported later if needed.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Apr 18, 2025
Updated
Aug 5, 2026
EPSS
0.2% · 21th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • 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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.19 and later · before 6.1.129
  • linux linux kernel6.2 and later · before 6.6.78
  • linux linux kernel6.7 and later · before 6.12.14
  • linux linux kernel6.13 and later · before 6.13.3

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

    • 5.19affected
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before 233b210a678bddf8b49b02a070074a52b87e6d43affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before a1b17713b32c75a90132ea2f92b1257f3bbc20f3affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before b86f1d51731e621e83305dc9564ae14c9ef752bfaffected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before a94592ec30ff67dc36c424327f1e0a9ceeeb9bd3affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before 35ae7910c349fb3c60439992e2e0e79061e95382affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before f0ef94553868d07c1b14d7743a7e2553e5a831a3affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before d63b0e8a628e62ca85a0f7915230186bb92f8bb4affected · git
    • before 5.19not affected · semver
    • 6.1.129 and later · up to and including 6.1.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.129-16.1.129-1
Debian:13linuxbefore 6.12.15-16.12.15-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-39989Apr 18, 2025 · x86/mce: use is_copy_from_user() to determine copy-from-user context
    22Monitor
  • ← EarlierCVE-2025-40325Apr 18, 2025 · md/raid10: wait barrier before returning discard request with REQ_NOWAIT
    22Monitor
  • Later →CVE-2025-37838Apr 18, 2025 · HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition
    31Monitor

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 Linux233b210a678bddf8b49b02a070074a52b87e6d43Vendor (CNA)
Linux Linux35ae7910c349fb3c60439992e2e0e79061e95382Vendor (CNA)
Linux Linuxa1b17713b32c75a90132ea2f92b1257f3bbc20f3Vendor (CNA)
Linux Linuxa94592ec30ff67dc36c424327f1e0a9ceeeb9bd3Vendor (CNA)
Linux Linuxb86f1d51731e621e83305dc9564ae14c9ef752bfVendor (CNA)
Linux Linuxd63b0e8a628e62ca85a0f7915230186bb92f8bb4Vendor (CNA)
Linux Linuxf0ef94553868d07c1b14d7743a7e2553e5a831a3Vendor (CNA)
debian:linux6.1.129-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

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✗ → ✓

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

References

Show all references (6 more)

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

All records