CVE-2025-68263Network attack vector

Kernel memory corruption via unlocked IPC response race

Published Dec 16, 2025 · Updated Dec 16, 2025

Use-after-free in the Linux ksmbd IPC path allows remote attackers to write freed kernel memory by racing concurrent netlink replies. ipc_msg_send_request validates and frees entry->response without ipc_msg_table_lock while handle_response copies reply data into that buffer under the lock. High concurrency is required; the corruption occurs in kernel context, while the published record documents neither reliable code execution nor a repeatable service crash.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux ksmbd IPC path allows remote attackers to write freed kernel memory by racing concurrent netlink replies. ipc_msg_send_request validates and frees entry->response without ipc_msg_table_lock while handle_response copies reply data into that buffer under the lock. High concurrency is required; the corruption occurs in kernel context, while the published record documents neither reliable code execution nor a repeatable service crash.

The record

CVE
CVE-2025-68263
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

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?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1fab1fa091f5aa97265648b53ea031deedd26235
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <759c8c30cfa8706c518e56f67971b1f0932f4b9b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8229c6ca50cea701e25a7ee25f48441b582ec5fa

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1fab1fa091f5aa97265648b53ea031deedd26235; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <759c8c30cfa8706c518e56f67971b1f0932f4b9b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8229c6ca50cea701e25a7ee25f48441b582ec5fa

Published CVSS scores

9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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