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NVD / CVE Program· CNA Linux

CVE-2026-68401: firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit()

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: 0.13% (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 00bef9d0f9e787f56ff4699d3b577983ff8b7f24, 27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1b, 3383ffb7ef937317361713ffcc21921a7848511a; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00bef9d0f9e787f56ff4699d3b577983ff8b7f24, 27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1b, 3383ffb7ef937317361713ffcc21921a7848511a; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes 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: firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit() Sashiko (locally) reports multiple out-of-bound issues in ffa_setup_and_transmit: 1) Writing ep_mem_access->reserved can write out of bounds for FFA versions < 1.2 as ffa_emad_size_get() returns 16 bytes in that case while reserved has an offset of 24. Instead of zeroing fields, memset the struct to zero first based on the FFA version. 2) Make sure there is enough size to write constituents. While at it, convert the only sizeof() in the driver that uses a type instead of variable.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 3th 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 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
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-2026-68401

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.

—

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

    • 28ebfb74fbf513e0c7cd2674d8c2400ee0220d18, b77ec23b6df41c48e88735230e11caec56163630, 6.4affected
    • 22157f74458106c5900dbd938eb44623c22d97a0 and later · before 500f92f398c717aa515afd23c7a38c0e7f4a1dc9affected · git
    • 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 and later · before d312a71b19bb83803c8d1372bc042bd36db657f7affected · git
    • 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 and later · before 00bef9d0f9e787f56ff4699d3b577983ff8b7f24affected · git
    • 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 and later · before cf5708c9d78c98214c62b1e5d049cd527a543b8eaffected · git
    • 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 and later · before 27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1baffected · git
    • 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 and later · before 3383ffb7ef937317361713ffcc21921a7848511aaffected · git
    • 6.1.31 and later · before 6.1.191affected · semver
    • 5.15.114 and later · before 5.16affected · semver
    • 6.3.5 and later · before 6.4affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
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-2026-68399Aug 10, 2026 · bpf: Fix UAF in sock clone early bailouts
    31Monitor
  • ← EarlierCVE-2026-68400Aug 10, 2026 · firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation
    31Monitor
  • Later →CVE-2026-68402Aug 10, 2026 · wifi: cfg80211: bound element ID read when checking non-inheritance
    28Monitor

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 Linux00bef9d0f9e787f56ff4699d3b577983ff8b7f24Vendor (CNA)
Linux Linux27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1bVendor (CNA)
Linux Linux3383ffb7ef937317361713ffcc21921a7848511aVendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux500f92f398c717aa515afd23c7a38c0e7f4a1dc9Vendor (CNA)
Linux Linux6.1.191Vendor (CNA)
Linux Linux6.4Vendor (CNA)
Linux Linuxcf5708c9d78c98214c62b1e5d049cd527a543b8eVendor (CNA)
Linux Linuxd312a71b19bb83803c8d1372bc042bd36db657f7Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux7.1.6-1 · Debian:14Package 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

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-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 (5 more)

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

All records