CVE-2025-40112

Kernel crash via faulty SPARC copy epilogue

Published Nov 12, 2025 · Updated Nov 12, 2025

Improper exception handling in Linux kernels using SPARC Niagara copy routines allows local users to crash the kernel via a faulting user pointer. In arch/sparc/lib/NGmemcpy.S, exception handlers miscalculate the remaining byte count and return without restoring the register window. An unprivileged local process can trigger the fault through ordinary system calls; the documented consequences are a kernel crash and incorrect copy return values.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Improper exception handling in Linux kernels using SPARC Niagara copy routines allows local users to crash the kernel via a faulting user pointer. In arch/sparc/lib/NGmemcpy.S, exception handlers miscalculate the remaining byte count and return without restoring the register window. An unprivileged local process can trigger the fault through ordinary system calls; the documented consequences are a kernel crash and incorrect copy return values.

The record

CVE
CVE-2025-40112
Published
Nov 12, 2025
Updated
Nov 12, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.9
  2. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <05440320ea3e249d5f984918f2bf51210c1a7c03
  3. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <088c5098ec6d6b0396edfbf3dad3e81de8469c1c
  4. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <0b67c8fc10b13a9090340c5f8a37d308f4e1571c
  5. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <37547d8e6eba87507279ee3dfddfd9dc46335454
  6. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <7823fc4d8ab5e57f8db7806ff2530c03c166c4bb
  7. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <8cdeb5e482d3fdce7e825444b6ca3865e24c0228
  8. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <a365ee556e45f780ee322b349a06efdad0c1458f
  9. Affected versionversion=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <a90ce516a73dbe087f9bf3dbf311301a58d125c6
  10. Affected versionversion=a15859f9d8396cce7c55ccdb7e75f70f14cbc349
  11. Affected versionversion=bfc8be6593097cb074d3912ba2f27565cfbb7d6e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <05440320ea3e249d5f984918f2bf51210c1a7c03; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <088c5098ec6d6b0396edfbf3dad3e81de8469c1c; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <0b67c8fc10b13a9090340c5f8a37d308f4e1571c; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <37547d8e6eba87507279ee3dfddfd9dc46335454; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <7823fc4d8ab5e57f8db7806ff2530c03c166c4bb; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <8cdeb5e482d3fdce7e825444b6ca3865e24c0228; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <a365ee556e45f780ee322b349a06efdad0c1458f; version=7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e <a90ce516a73dbe087f9bf3dbf311301a58d125c6; version=a15859f9d8396cce7c55ccdb7e75f70f14cbc349; version=bfc8be6593097cb074d3912ba2f27565cfbb7d6e

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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