CVE-2025-68219

Kernel memory consumption via leaked mount-source strings

Published Dec 16, 2025 · Updated Dec 16, 2025

Memory leak in the Linux kernel CIFS client allows local users to consume kernel memory through a failing source mount option. When smb3_fs_context_parse_param allocates ctx->source and duplicates it into fc->source, a later error jumps to cifs_parse_mount_err without freeing either string. Reaching the path requires CAP_SYS_ADMIN to submit CIFS mount options; repeated failures retain allocations and reduce available kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel CIFS client allows local users to consume kernel memory through a failing source mount option. When smb3_fs_context_parse_param allocates ctx->source and duplicates it into fc->source, a later error jumps to cifs_parse_mount_err without freeing either string. Reaching the path requires CAP_SYS_ADMIN to submit CIFS mount options; repeated failures retain allocations and reduce available kernel memory.

The record

CVE
CVE-2025-68219
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 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?

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  1. Affected versionversion=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <37010021d7e0341bb241ca00bcbae31f2c50b23f
  2. Affected versionversion=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <48d69290270891f988e72edddd9688c20515421d
  3. Affected versionversion=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <7627864dc3121f39e220f5253a227edf472de59e
  4. Affected versionversion=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5
  5. Affected versionversion=5.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <37010021d7e0341bb241ca00bcbae31f2c50b23f; version=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <48d69290270891f988e72edddd9688c20515421d; version=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <7627864dc3121f39e220f5253a227edf472de59e; version=24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f <7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5; version=5.11

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

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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