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NVD / CVE Program· CNA Linux

CVE-2025-68786: ksmbd: skip lock-range check on equal size to avoid size==0 underflow

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 52fcbb92e0d3acfd1448b2a43b6595d540da5295, 571204e4758a528fbd67330bd4b0dfbdafb33dd8, 5d510ac31626ed157d2182149559430350cf2104.

Low priority for now. Upgrade to Linux Linux 52fcbb92e0d3acfd1448b2a43b6595d540da5295, 571204e4758a528fbd67330bd4b0dfbdafb33dd8, 5d510ac31626ed157d2182149559430350cf2104 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: ksmbd: skip lock-range check on equal size to avoid size==0 underflow When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1` and can underflow for size==0. Skip the equal case.

—No exploit Fix available
Published
Jan 13, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 10th 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%

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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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  • when exploit code appears or is weaponized
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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

    • 5.15affected
    • f44158485826c076335d6860d35872271a83791d and later · before 52fcbb92e0d3acfd1448b2a43b6595d540da5295affected · git
    • f44158485826c076335d6860d35872271a83791d and later · before da29cd197246c85c0473259f1cad897d9d28faeaaffected · git
    • f44158485826c076335d6860d35872271a83791d and later · before a6f4cfa3783804336491e0edcb250c25f9b59d33affected · git
    • f44158485826c076335d6860d35872271a83791d and later · before 571204e4758a528fbd67330bd4b0dfbdafb33dd8affected · git
    • f44158485826c076335d6860d35872271a83791d and later · before 5d510ac31626ed157d2182149559430350cf2104affected · git
    • before 5.15not affected · semver
    • 6.1.160 and later · up to and including 6.1.*not affected · semver
    • 6.6.120 and later · up to and including 6.6.*not affected · semver
    • 6.12.64 and later · up to and including 6.12.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.3-16.18.3-1

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-2025-68783Jan 13, 2026 · ALSA: usb-mixer: us16x08: validate meter packet indices
    0Monitor
  • ← EarlierCVE-2025-68784Jan 13, 2026 · xfs: fix a UAF problem in xattr repair
    0Monitor
  • Later →CVE-2025-68790Jan 13, 2026 · net/mlx5: Fix double unregister of HCA_PORTS component
    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 Linux52fcbb92e0d3acfd1448b2a43b6595d540da5295Vendor (CNA)
Linux Linux571204e4758a528fbd67330bd4b0dfbdafb33dd8Vendor (CNA)
Linux Linux5d510ac31626ed157d2182149559430350cf2104Vendor (CNA)
Linux Linuxa6f4cfa3783804336491e0edcb250c25f9b59d33Vendor (CNA)
Linux Linuxda29cd197246c85c0473259f1cad897d9d28faeaVendor (CNA)
debian:linux6.1.162-1 · 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.

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

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✗ → ✓

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

References

Show all references (4 more)

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

All records