CVE-2026-53395Network attack vector

Service interruption via nfsd ACL object leak

Published Jul 19, 2026 · Updated Jul 19, 2026

Memory leak in nfsd in Linux Kernel 7.0 through 7.1.2 allows remote attackers to exhaust kernel memory through NFSv4 CREATE requests. nfsd4_create tests already-cleared ACL source pointers, so nfsd4_acl_to_attr overwrites the transferred POSIX ACL pointers without releasing two slab objects. A reachable NFSv4 server that accepts crafted CREATE attributes is required; repeated requests exhaust kernel slab memory and interrupt the NFS service or host.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in nfsd in Linux Kernel 7.0 through 7.1.2 allows remote attackers to exhaust kernel memory through NFSv4 CREATE requests. nfsd4_create tests already-cleared ACL source pointers, so nfsd4_acl_to_attr overwrites the transferred POSIX ACL pointers without releasing two slab objects. A reachable NFSv4 server that accepts crafted CREATE attributes is required; repeated requests exhaust kernel slab memory and interrupt the NFS service or host.

The record

CVE
CVE-2026-53395
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-674, T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=7.0
  2. Affected versionversion=d2ca50606f5f0235d7780c1cd73b6614a5d07620 <8371cc5c0a2cc2a71b3dcfd47ff1f7fcfc526a5e
  3. Affected versionversion=d2ca50606f5f0235d7780c1cd73b6614a5d07620 <a60f25a800846ab8e5a13f8a9d05111f2aee55a7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=7.0; version=d2ca50606f5f0235d7780c1cd73b6614a5d07620 <8371cc5c0a2cc2a71b3dcfd47ff1f7fcfc526a5e; version=d2ca50606f5f0235d7780c1cd73b6614a5d07620 <a60f25a800846ab8e5a13f8a9d05111f2aee55a7

Published CVSS scores

7.5Linux kernel CVE team (kernel.org)CVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
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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