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CVE-2026-64280· NVD / CVE Program· CNA Linux

fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.16% (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 16381bda90b261a656ded0568630c1b857b2ebc8, 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc, 59070040fd12e0b78d7b4d341d9f9a183237c5ff.

Low priority for now. Upgrade to Linux Linux 16381bda90b261a656ded0568630c1b857b2ebc8, 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc, 59070040fd12e0b78d7b4d341d9f9a183237c5ff 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: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Aug 23, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-64280

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 kernel4.19 and later · before 6.6.148
  • linux linux kernel6.7 and later · before 6.12.101
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4

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

    • 4.19affected
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbcaffected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before d7e787eee2ea619b6dbb98890472ee73daf2e7fdaffected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before a6a3884ff500f04f3088d6d09eec803cd35331a2affected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before 16381bda90b261a656ded0568630c1b857b2ebc8affected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before b50e6cd2395cde615f59b624819998d28c0668d6affected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before 59070040fd12e0b78d7b4d341d9f9a183237c5ffaffected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231affected · git
    • fa8dda1edef9ebc3af467c644c5533ac97171e12 and later · before fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27affected · git
    • before 4.19not 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 7.1.4-17.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64275Jul 25, 2026 · Input: elan_i2c - prevent division by zero and arithmetic underflow
    22Monitor
  • ← EarlierCVE-2026-64278Jul 25, 2026 · i2c: imx-lpi2c: mark I2C adapter when hardware is powered down
    22Monitor
  • Later →CVE-2026-64281Jul 25, 2026 · svcrdma: wake sq waiters when the transport closes
    30Monitor

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 Linux16381bda90b261a656ded0568630c1b857b2ebc8Vendor (CNA)
Linux Linux5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbcVendor (CNA)
Linux Linux59070040fd12e0b78d7b4d341d9f9a183237c5ffVendor (CNA)
Linux Linuxa6a3884ff500f04f3088d6d09eec803cd35331a2Vendor (CNA)
Linux Linuxb50e6cd2395cde615f59b624819998d28c0668d6Vendor (CNA)
Linux Linuxd7e787eee2ea619b6dbb98890472ee73daf2e7fdVendor (CNA)
Linux Linuxfb2c0eab51ae5b02d2bae7d67c2cfbec39b57231Vendor (CNA)
Linux Linuxfc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27Vendor (CNA)
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).

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

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
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:C/C:H/I:H/A:H

nvd-secondary

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 (7 more)

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

All records