CVE-2023-52440

highpriority · attend · 49EPSS 0.223 · 98 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

22.3% (98th) EPSS

CVSS 7.8 · high

Is it mine?

24 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.4–10

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.110criticalAV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.17.4highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USprimaryCWE-119USCWE-120USCWE-190US

exploits (1)

Public proof-of-concept and weaponised exploit code.

BitsByWill/ksmbd-n-dayAuthenticated 0-click RCE against Linux 6.1.45 for CVE-2023-52440 and CVE-2023-4130PoC · poc_in_github

affected products (24)

Products and version ranges known to be affected.

Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Linux Linuxall versionsenisa_euvdEU
Linux Linux≤ 5.17enisa_euvdEU
Linux Linux< 6.1.52enisa_euvdEU
Linux Linux< 6.4.15enisa_euvdEU
Linux Linux< 6.5.2enisa_euvdEU
Linux Linux< 6.6enisa_euvdEU
Linux Linuxc5049d2d73b2… → bd554ed4fdc3…enisa_euvdEU
Linux Linuxf9929ef6a2a5… → 30fd6521b2fb…enisa_euvdEU
Linux Linuxf9929ef6a2a5… → 4b081ce0d830…enisa_euvdEU
Linux Linuxf9929ef6a2a5… → 7f1d6cb0eb6a…enisa_euvdEU
Linux Linuxf9929ef6a2a5… → ecd7e1c562cb…enisa_euvdEU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.14fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 12fstec_bduRU
Сообщество свободного программного обеспечения Linux5.15.0 → 5.15.144fstec_bduRU
Сообщество свободного программного обеспечения Linux5.16 → 6.1.51fstec_bduRU
Сообщество свободного программного обеспечения Linux6.2 → 6.4.14fstec_bduRU

showing 20 of 24

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0431Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten AngriffDeutsch2024-02-20csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2024-02-21modified 2026-08-15

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Related entries.

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+21023 more

references (17)

External citations — patches, advisories, analysis.

scry

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