CVE-2026-53210

Local denial of service via leaked TEE memory

Published Jun 25, 2026 · Updated Jun 25, 2026

Memory exhaustion in affected Linux Kernel releases allows local users to degrade availability through a zero-length TEE shared-memory registration. In register_shm_helper(), a zero return from iov_iter_npages() follows err_ctx_put after allocating shm, so the allocation is never freed. Reachability requires local access to TEE_IOC_SHM_REGISTER and a zero length; repeated calls consume kernel memory until service is interrupted.

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

What happened

Memory exhaustion in affected Linux Kernel releases allows local users to degrade availability through a zero-length TEE shared-memory registration. In register_shm_helper(), a zero return from iov_iter_npages() follows err_ctx_put after allocating shm, so the allocation is never freed. Reachability requires local access to TEE_IOC_SHM_REGISTER and a zero length; repeated calls consume kernel memory until service is interrupted.

The record

CVE
CVE-2026-53210
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=6.8
  2. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <26682f5efc276e3ad96d102019472bfbf03833b2
  3. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <4277759906b44d923a38c8f59f5576501b187b0d
  4. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <c10c9c48b2903f41ed4c532043b0576e86228236
  5. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <dbf779db927414f5b37c1f666013e9b48a88cfde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.8; version=7bdee41575919773818e525ea19e54eb817770af <26682f5efc276e3ad96d102019472bfbf03833b2; version=7bdee41575919773818e525ea19e54eb817770af <4277759906b44d923a38c8f59f5576501b187b0d; version=7bdee41575919773818e525ea19e54eb817770af <c10c9c48b2903f41ed4c532043b0576e86228236; version=7bdee41575919773818e525ea19e54eb817770af <dbf779db927414f5b37c1f666013e9b48a88cfde

Published CVSS scores

5.5NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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