CVE-2023-53360

Kernel crash via READ_PLUS scratch double-free

Published Sep 17, 2025 · Updated Sep 17, 2025

Double-free in Linux NFSv4.2 READ_PLUS handling allows local users to crash the kernel through reads on mounted shares. The page I/O path can reuse one nfs_pgio_header for multiple requests, while nfs4_proc_read_setup() initializes scratch storage only once; cleanup then frees the same scratch buffer twice or leaves a NULL buffer with a nonzero length. An NFSv4.2 client must process READ_PLUS replies, especially hole segments; the resulting kernel oops interrupts the affected host.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in Linux NFSv4.2 READ_PLUS handling allows local users to crash the kernel through reads on mounted shares. The page I/O path can reuse one nfs_pgio_header for multiple requests, while nfs4_proc_read_setup() initializes scratch storage only once; cleanup then frees the same scratch buffer twice or leaves a NULL buffer with a nonzero length. An NFSv4.2 client must process READ_PLUS replies, especially hole segments; the resulting kernel oops interrupts the affected host.

The record

CVE
CVE-2023-53360
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2025Record 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=6.4
  2. Affected versionversion=886959f425b6a936a30b82a297ae3aecb3b8230f <adac9f0ddd2b291c7ce41f549fdb27a13616cff5
  3. Affected versionversion=fbd2a05f29a95d5b42b294bf47e55a711424965b <303a78052091c81e9003915c521fdca1c7e117af
  4. Affected versionversion=fbd2a05f29a95d5b42b294bf47e55a711424965b <a2f4cb206bd94b3f4a7bb05fcdce9525283b5681
  5. Affected versionversion=fbd2a05f29a95d5b42b294bf47e55a711424965b <ae5d5672f1db711e91db6f52df5cb16ecd8f5692

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=886959f425b6a936a30b82a297ae3aecb3b8230f <adac9f0ddd2b291c7ce41f549fdb27a13616cff5; version=fbd2a05f29a95d5b42b294bf47e55a711424965b <303a78052091c81e9003915c521fdca1c7e117af; version=fbd2a05f29a95d5b42b294bf47e55a711424965b <a2f4cb206bd94b3f4a7bb05fcdce9525283b5681; version=fbd2a05f29a95d5b42b294bf47e55a711424965b <ae5d5672f1db711e91db6f52df5cb16ecd8f5692

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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.

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-415Double Free
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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