CVE-2026-64188

Kernel compromise via RMNET endpoint use-after-free

Published Jul 20, 2026 · Updated Jul 20, 2026

Use-after-free in the Linux Kernel RMNET driver allows local users to corrupt kernel memory via concurrent packet injection and link deletion. rmnet_dellink() removes an endpoint with hlist_del_init_rcu() but frees it immediately with kfree(), so RCU receive-path readers can dereference the stale ep->egress_dev pointer. A low-privilege user can obtain CAP_NET_ADMIN in a private user and network namespace, race crafted TUN frames against RMNET link deletion, and crash the kernel or corrupt memory for privilege escalation.

CVSS severity7.8
High
EPSS probability0.12%
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 Kernel RMNET driver allows local users to corrupt kernel memory via concurrent packet injection and link deletion. rmnet_dellink() removes an endpoint with hlist_del_init_rcu() but frees it immediately with kfree(), so RCU receive-path readers can dereference the stale ep->egress_dev pointer. A low-privilege user can obtain CAP_NET_ADMIN in a private user and network namespace, race crafted TUN frames against RMNET link deletion, and crash the kernel or corrupt memory for privilege escalation.

The record

CVE
CVE-2026-64188
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record 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=4.14
  2. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <1078ae8175777e80c9637996fb4a46c55f0ce576
  3. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <310b93246bfec7d4452507e0c15477377ed9f025
  4. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <41e06fcc5df0774d212e70c5b503fc769492bce3
  5. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <8b17adf6d4fb6bf61fa4c3f58366a7c082799a71
  6. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <9918698cf3aee4032e12bb42fd5a951dc465339b
  7. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <c4e676c3505c5058922dc1a6f1ded795f6758135
  8. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <d00c953a8f69921f484b629801766da68f27f658
  9. Affected versionversion=ceed73a2cf4aff2921802aa3d21d45280677547d <f193e38cb257d033060b63f1cfd94af076b3a2ab

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14; version=ceed73a2cf4aff2921802aa3d21d45280677547d <1078ae8175777e80c9637996fb4a46c55f0ce576; version=ceed73a2cf4aff2921802aa3d21d45280677547d <310b93246bfec7d4452507e0c15477377ed9f025; version=ceed73a2cf4aff2921802aa3d21d45280677547d <41e06fcc5df0774d212e70c5b503fc769492bce3; version=ceed73a2cf4aff2921802aa3d21d45280677547d <8b17adf6d4fb6bf61fa4c3f58366a7c082799a71; version=ceed73a2cf4aff2921802aa3d21d45280677547d <9918698cf3aee4032e12bb42fd5a951dc465339b; version=ceed73a2cf4aff2921802aa3d21d45280677547d <c4e676c3505c5058922dc1a6f1ded795f6758135; version=ceed73a2cf4aff2921802aa3d21d45280677547d <d00c953a8f69921f484b629801766da68f27f658; version=ceed73a2cf4aff2921802aa3d21d45280677547d <f193e38cb257d033060b63f1cfd94af076b3a2ab

Published CVSS scores

7.8Linux kernel.orgCVSS: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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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