CVE-2023-52764Public exploit

Kernel undefined behavior via unchecked exposure gain

Published May 21, 2024 · Updated May 11, 2026

Shift-out-of-bounds in Linux kernel 2.6.34 and later allows local users to trigger undefined behavior through CPiA camera controls. The cpia1 set_flicker function left-shifts currentexp by the unchecked sd->params.exposure.gain value, so gains above 31 exceed the width of an int. Reachability requires the gspca cpia1 media driver and access to its V4L2 control path; published testing observed a UBSAN kernel fault, not a demonstrated privilege gain.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Shift-out-of-bounds in Linux kernel 2.6.34 and later allows local users to trigger undefined behavior through CPiA camera controls. The cpia1 set_flicker function left-shifts currentexp by the unchecked sd->params.exposure.gain value, so gains above 31 exceed the width of an int. Reachability requires the gspca cpia1 media driver and access to its V4L2 control path; published testing observed a UBSAN kernel fault, not a demonstrated privilege gain.

The record

CVE
CVE-2023-52764
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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

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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=2.6.34
  2. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <099be1822d1f095433f4b08af9cc9d6308ec1953
  3. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <09cd8b561aa9796903710a1046957f2b112c8f26
  4. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <2eee8edfff90e22980a6b22079d238c3c9d323bb
  5. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <69bba62600bd91d6b7c1e8ca181faf8ac64f7060
  6. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <8f83c85ee88225319c52680792320c02158c2a9b
  7. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <93bddd6529f187f510eec759f37d0569243c9809
  8. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <a647f27a7426d2fe1b40da7c8fa2b81354a51177
  9. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <c6b6b8692218da73b33b310d7c1df90f115bdd9a
  10. Affected versionversion=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <e2d7149b913d14352c82624e723ce1c211ca06d3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <099be1822d1f095433f4b08af9cc9d6308ec1953; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <09cd8b561aa9796903710a1046957f2b112c8f26; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <2eee8edfff90e22980a6b22079d238c3c9d323bb; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <69bba62600bd91d6b7c1e8ca181faf8ac64f7060; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <8f83c85ee88225319c52680792320c02158c2a9b; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <93bddd6529f187f510eec759f37d0569243c9809; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <a647f27a7426d2fe1b40da7c8fa2b81354a51177; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <c6b6b8692218da73b33b310d7c1df90f115bdd9a; version=54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 <e2d7149b913d14352c82624e723ce1c211ca06d3

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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-787Out-of-bounds Write

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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