CVE-2025-39913

Local system crash via unreverted socket allocation

Published Oct 1, 2025 · Updated Jun 11, 2026

Improper input validation in the Linux kernel allows local users to crash the system through a failed TCP BPF cork allocation. tcp_bpf_send_verdict silently leaves the sk_msg_alloc change to sk_forward_alloc unreverted when psock->cork allocation fails. Reaching the fault requires low local privileges, a sk_msg BPF program attached to a SOCKMAP, corked data, and an induced allocation failure.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the Linux kernel allows local users to crash the system through a failed TCP BPF cork allocation. tcp_bpf_send_verdict silently leaves the sk_msg_alloc change to sk_forward_alloc unreverted when psock->cork allocation fails. Reaching the fault requires low local privileges, a sk_msg BPF program attached to a SOCKMAP, corked data, and an induced allocation failure.

The record

CVE
CVE-2025-39913
Published
Oct 1, 2025
Updated
Jun 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 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=4.17
  2. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <05366527f44cf4b884f3d9462ae8009be9665856
  3. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <08f58d10f5abf11d297cc910754922498c921f91
  4. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <539920180c55f5e13a2488a2339f94e6b8cb69e0
  5. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <66bcb04a441fbf15d66834b7e3eefb313dd750c8
  6. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <7429b8b9bfbc276fd304fbaebc405f46b421fedf
  7. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <9c2a6456bdf9794474460d885c359b6c4522d6e3
  8. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <a3967baad4d533dc254c31e0d221e51c8d223d58
  9. Affected versionversion=4f738adba30a7cfc006f605707e7aee847ffefa0 <de89e58368f8f07df005ecc1c86ad94898a999f2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <05366527f44cf4b884f3d9462ae8009be9665856; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <08f58d10f5abf11d297cc910754922498c921f91; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <539920180c55f5e13a2488a2339f94e6b8cb69e0; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <66bcb04a441fbf15d66834b7e3eefb313dd750c8; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <7429b8b9bfbc276fd304fbaebc405f46b421fedf; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <9c2a6456bdf9794474460d885c359b6c4522d6e3; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <a3967baad4d533dc254c31e0d221e51c8d223d58; version=4f738adba30a7cfc006f605707e7aee847ffefa0 <de89e58368f8f07df005ecc1c86ad94898a999f2
Siemens · RUGGEDCOM RST2428Pversion=0 <V4.0

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

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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

CWE-20Improper Input Validation
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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