CVE-2025-68785

Kernel-memory disclosure and crash via unchecked NSH attribute

Published Jan 13, 2026 · Updated Jan 13, 2026

Out-of-bounds read in the Linux kernel Open vSwitch subsystem allows local users to disclose kernel memory or crash the system. validate_push_nsh() unwraps an unchecked middle attribute twice without verifying its OVS_KEY_ATTR_NSH type or size, so later execution copies beyond the exactly sized action buffer. Exploitation requires low-privilege local access and the ability to submit an NSH push action through the Open vSwitch Generic Netlink packet-execute path.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel Open vSwitch subsystem allows local users to disclose kernel memory or crash the system. validate_push_nsh() unwraps an unchecked middle attribute twice without verifying its OVS_KEY_ATTR_NSH type or size, so later execution copies beyond the exactly sized action buffer. Exploitation requires low-privilege local access and the ability to submit an NSH push action through the Open vSwitch Generic Netlink packet-execute path.

The record

CVE
CVE-2025-68785
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.15
  2. Affected versionversion=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <10ffc558246f2c75619aedda0921906095e46702
  3. Affected versionversion=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <1b569db9c2f28b599e40050524aae5f7332bc294
  4. Affected versionversion=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <2ecfc4433acdb149eafd7fb22d7fd4adf90b25e9
  5. Affected versionversion=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <5ace7ef87f059d68b5f50837ef3e8a1a4870c36e
  6. Affected versionversion=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <c999153bfb2d1d9b295b7010d920f2a7c6d7595f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <10ffc558246f2c75619aedda0921906095e46702; version=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <1b569db9c2f28b599e40050524aae5f7332bc294; version=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <2ecfc4433acdb149eafd7fb22d7fd4adf90b25e9; version=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <5ace7ef87f059d68b5f50837ef3e8a1a4870c36e; version=b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 <c999153bfb2d1d9b295b7010d920f2a7c6d7595f

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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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