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NVD / CVE Program· CNA Linux

CVE-2025-40126: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC

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: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 0bf3dc3a2156f1c5ddaba4b85d09767874634114, 4.5, 4.9.

Low priority for now. Upgrade to Linux Linux 0bf3dc3a2156f1c5ddaba4b85d09767874634114, 4.5, 4.9 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: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.

—No exploit Fix available
Published
Nov 12, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 13th 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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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

    • 1731d90d8a558ecb20cdee0c2c001ae8e15c251d, b0580eadc19ff3a617a7d07cfaf2a985153c114e, 4.9affected
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 0bf3dc3a2156f1c5ddaba4b85d09767874634114affected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 41c18baee66134e6ef786eb075c1b6adb22432b0affected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 59424dc0d0e044b2eb007686a4724ddd91d57db5affected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 9b137f277cc3297044aabd950f589e505d30104caffected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 674ff598148a28bae0b5372339de56f2abf0b1d1affected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 7de3a75bbc8465d816336c74d50109e73501efabaffected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 57c278500fce3cd4e1c540700c0b05426a958393affected · git
    • cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada and later · before 4fba1713001195e59cfc001ff1f2837dab877efbaffected · git
    • 4.4.34 and later · before 4.5affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

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-2025-40124Nov 12, 2025 · sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III
    31Monitor
  • ← EarlierCVE-2025-40125Nov 12, 2025 · blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx
    0Monitor
  • Later →CVE-2025-40127Nov 12, 2025 · hwrng: ks-sa - fix division by zero in ks_sa_rng_init
    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 Linux0bf3dc3a2156f1c5ddaba4b85d09767874634114Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux4.9Vendor (CNA)
Linux Linux41c18baee66134e6ef786eb075c1b6adb22432b0Vendor (CNA)
Linux Linux4fba1713001195e59cfc001ff1f2837dab877efbVendor (CNA)
Linux Linux57c278500fce3cd4e1c540700c0b05426a958393Vendor (CNA)
Linux Linux59424dc0d0e044b2eb007686a4724ddd91d57db5Vendor (CNA)
Linux Linux674ff598148a28bae0b5372339de56f2abf0b1d1Vendor (CNA)
Linux Linux7de3a75bbc8465d816336c74d50109e73501efabVendor (CNA)
Linux Linux9b137f277cc3297044aabd950f589e505d30104cVendor (CNA)
debian:linux6.1.158-1 · 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

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 (7 more)

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

All records