CVE-2025-68724

Kernel memory corruption via oversized certificate fields

Published Dec 24, 2025 · Updated Dec 24, 2025

A buffer overflow in the Linux asymmetric-key subsystem allows local users to corrupt kernel memory via crafted X.509 certificate fields. asymmetric_key_generate_id adds two attacker-controlled blob lengths and a structure size without overflow checks, allowing an undersized allocation before memcpy operations. Local access is required to submit certificate data for kernel processing, and no reliable privilege-escalation or code-execution outcome is documented.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in the Linux asymmetric-key subsystem allows local users to corrupt kernel memory via crafted X.509 certificate fields. asymmetric_key_generate_id adds two attacker-controlled blob lengths and a structure size without overflow checks, allowing an undersized allocation before memcpy operations. Local access is required to submit certificate data for kernel processing, and no reliable privilege-escalation or code-execution outcome is documented.

The record

CVE
CVE-2025-68724
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=3.18
  2. Affected versionversion=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <6af753ac5205115e6c310c8c4236c01b59a1c44f
  3. Affected versionversion=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <b7090a5c153105b9fd221a5a81459ee8cd5babd6
  4. Affected versionversion=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <c73be4f51eed98fa0c7c189db8f279e1c86bfbf7
  5. Affected versionversion=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <df0845cf447ae1556c3440b8b155de0926cbaa56

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <6af753ac5205115e6c310c8c4236c01b59a1c44f; version=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <b7090a5c153105b9fd221a5a81459ee8cd5babd6; version=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <c73be4f51eed98fa0c7c189db8f279e1c86bfbf7; version=7901c1a8effbe5f89673bfc09d6e37b8f334f1a7 <df0845cf447ae1556c3440b8b155de0926cbaa56

Published CVSS scores

7.8Linux kernel CNACVSS: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

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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