CVE-2023-52507Public exploit

Kernel fault via unchecked NFC protocol shift

Published Mar 2, 2024 · Updated May 11, 2026

Out-of-bounds shift in Linux kernel NFC NCI 3.2 through 6.5.7 allows local users to trigger a kernel fault via an invalid protocol value. The nci_activate_target function uses the unvalidated protocol as the shift count in a supported_protocols bitmask before confirming that it is below NFC_PROTO_MAX. Reachability requires local access to an NCI target and the NFC generic-netlink activation path; the public reproducer demonstrates a UBSAN fault, not code execution.

CVSS severity7.1
High
EPSS probability0.24%
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 shift in Linux kernel NFC NCI 3.2 through 6.5.7 allows local users to trigger a kernel fault via an invalid protocol value. The nci_activate_target function uses the unvalidated protocol as the shift count in a supported_protocols bitmask before confirming that it is below NFC_PROTO_MAX. Reachability requires local access to an NCI target and the NFC generic-netlink activation path; the public reproducer demonstrates a UBSAN fault, not code execution.

The record

CVE
CVE-2023-52507
Published
Mar 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.2
  2. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <25dd54b95abfdca423b65a4ee620a774777d8213
  3. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <2c231a247a1d1628e41fa1eefd1a5307c41c5f53
  4. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <354a6e707e29cb0c007176ee5b8db8be7bd2dee0
  5. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <6584eba7688dcf999542778b07f63828c21521da
  6. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <853dda54ba59ea70d5580a298b7ede4707826848
  7. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <95733ea130e35ef9ec5949a5908dde3feaba92cb
  8. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <a424807d860ba816aaafc3064b46b456361c0802
  9. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <a686f84101680b8442181a8846fbd3c934653729

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <25dd54b95abfdca423b65a4ee620a774777d8213; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <2c231a247a1d1628e41fa1eefd1a5307c41c5f53; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <354a6e707e29cb0c007176ee5b8db8be7bd2dee0; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <6584eba7688dcf999542778b07f63828c21521da; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <853dda54ba59ea70d5580a298b7ede4707826848; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <95733ea130e35ef9ec5949a5908dde3feaba92cb; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <a424807d860ba816aaafc3064b46b456361c0802; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <a686f84101680b8442181a8846fbd3c934653729

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

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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