CVE-2023-53083Network attack vector

Remote kernel corruption via duplicate splice page insertion

Published May 2, 2025 · Updated Aug 5, 2026

Out-of-bounds write in Linux kernel 5.19 and affected commits allows remote attackers to corrupt memory via NFS READ requests. During a partial-page splice continuation, nfsd_splice_actor inserts the same page into rq_pages twice until rq_next_page overruns the array and overwrites adjacent pointers. Any host permitted by a typical AUTH_SYS export can trigger the flaw without server-verified credentials, enabling kernel memory disclosure, control-flow hijacking, or a server crash.

CVSS severity9.8
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel 5.19 and affected commits allows remote attackers to corrupt memory via NFS READ requests. During a partial-page splice continuation, nfsd_splice_actor inserts the same page into rq_pages twice until rq_next_page overruns the array and overwrites adjacent pointers. Any host permitted by a typical AUTH_SYS export can trigger the flaw without server-verified credentials, enabling kernel memory disclosure, control-flow hijacking, or a server crash.

The record

CVE
CVE-2023-53083
Published
May 2, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 2, 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

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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=5.19
  2. Affected versionversion=56bc7e3821e847a6cc8027ddaba32e9a440225a5 <12eca509234acb6b666802edf77408bb70d7bfca
  3. Affected versionversion=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <0101067f376eb7b9afd00279270f25d5111a091d
  4. Affected versionversion=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <27c934dd8832dd40fd34776f916dc201e18b319b
  5. Affected versionversion=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <51ddb84baff6f09ad62b5999ece3ec172e4e3568
  6. Affected versionversion=bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361 <8235cd619db6e67f1d7d26c55f1f3e4e575c947d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=56bc7e3821e847a6cc8027ddaba32e9a440225a5 <12eca509234acb6b666802edf77408bb70d7bfca; version=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <0101067f376eb7b9afd00279270f25d5111a091d; version=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <27c934dd8832dd40fd34776f916dc201e18b319b; version=91e23b1c39820bfed642119ff6b6ef9f43cf09ce <51ddb84baff6f09ad62b5999ece3ec172e4e3568; version=bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361 <8235cd619db6e67f1d7d26c55f1f3e4e575c947d

Published CVSS scores

9.8Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

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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

T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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