CVE-2025-37757Network attack vector

Kernel memory exhaustion via unpurged TIPC buffers

Published May 1, 2025 · Updated Aug 5, 2026

A memory leak in TIPC in Linux 4.11 and affected later branches allows remote attackers to exhaust kernel memory via TIPC traffic. When backlog overload makes tipc_link_xmit return -ENOBUFS, net/tipc/link.c leaves the skb list unpurged and permanently orphans buffers. An unauthenticated peer reaching a configured TIPC UDP or Ethernet bearer can force allocation failures, OOM pressure, and lost TIPC connectivity.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in TIPC in Linux 4.11 and affected later branches allows remote attackers to exhaust kernel memory via TIPC traffic. When backlog overload makes tipc_link_xmit return -ENOBUFS, net/tipc/link.c leaves the skb list unpurged and permanently orphans buffers. An unauthenticated peer reaching a configured TIPC UDP or Ethernet bearer can force allocation failures, OOM pressure, and lost TIPC connectivity.

The record

CVE
CVE-2025-37757
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=365ad353c2564bba8835290061308ba825166b3a <09c2dcda2c551bba30710c33f6ac678ae7395389
  2. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb
  3. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <69ae94725f4fc9e75219d2d69022029c5b24bc9a
  4. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <7c5957f7905b4aede9d7a559d271438f3ca9e852
  5. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <84895f5ce3829d9fc030e5ec2d8729da4c0c9d08
  6. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <a40cbfbb8f95c325430f017883da669b2aa927d4
  7. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <d0e02d3d27a0b4dcb13f954f537ca1dd8f282dcf
  8. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <d4d40e437adb376be16b3a12dd5c63f0fa768247
  9. Affected versionversion=365ad353c2564bba8835290061308ba825166b3a <ed06675d3b8cd37120b447646d53f7cd3e6fcd63
  10. Affected versionversion=4.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=365ad353c2564bba8835290061308ba825166b3a <09c2dcda2c551bba30710c33f6ac678ae7395389; version=365ad353c2564bba8835290061308ba825166b3a <24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb; version=365ad353c2564bba8835290061308ba825166b3a <69ae94725f4fc9e75219d2d69022029c5b24bc9a; version=365ad353c2564bba8835290061308ba825166b3a <7c5957f7905b4aede9d7a559d271438f3ca9e852; version=365ad353c2564bba8835290061308ba825166b3a <84895f5ce3829d9fc030e5ec2d8729da4c0c9d08; version=365ad353c2564bba8835290061308ba825166b3a <a40cbfbb8f95c325430f017883da669b2aa927d4; version=365ad353c2564bba8835290061308ba825166b3a <d0e02d3d27a0b4dcb13f954f537ca1dd8f282dcf; version=365ad353c2564bba8835290061308ba825166b3a <d4d40e437adb376be16b3a12dd5c63f0fa768247; version=365ad353c2564bba8835290061308ba825166b3a <ed06675d3b8cd37120b447646d53f7cd3e6fcd63; version=4.11

Published CVSS scores

7.5Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.1Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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