CVE-2021-47645

Local system crash via miscalculated buffer index

Published Feb 26, 2025 · Updated Aug 11, 2026

NULL pointer dereference in the Linux kernel's Zoran media driver allows local users to crash the system through video capture activity. In zoran_reap_stat_com, the tmp_dcim=1 path adds one to a parity-derived slot index, selects the wrong inuse buffer, and dereferences a NULL buffer. Reaching the flaw requires local access to the Zoran video-capture path; the documented impact is an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel's Zoran media driver allows local users to crash the system through video capture activity. In zoran_reap_stat_com, the tmp_dcim=1 path adds one to a parity-derived slot index, selects the wrong inuse buffer, and dereferences a NULL buffer. Reaching the flaw requires local access to the Zoran video-capture path; the documented impact is an availability-only kernel crash.

The record

CVE
CVE-2021-47645
Published
Feb 26, 2025
Updated
Aug 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 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=5.10
  2. Affected versionversion=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <20811bbe685ca3eddd34b0c750860427d7030910
  3. Affected versionversion=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <20db2ed1e2f9fcd417fa67853e5154f0c2537d6c
  4. Affected versionversion=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <7e76f3ed7ab2ae026c6ef9cc23096a7554af8c52
  5. Affected versionversion=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <8dce4b265a5357731058f69645840dabc718c687
  6. Affected versionversion=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <bafec1a6ba4b187a7fcdcfce0faebdc623d4ef8e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <20811bbe685ca3eddd34b0c750860427d7030910; version=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <20db2ed1e2f9fcd417fa67853e5154f0c2537d6c; version=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <7e76f3ed7ab2ae026c6ef9cc23096a7554af8c52; version=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <8dce4b265a5357731058f69645840dabc718c687; version=83f89a8bcbc3c520a889b5fc7c4b95669d712f65 <bafec1a6ba4b187a7fcdcfce0faebdc623d4ef8e

Published CVSS scores

5.5CISA-ADPCVSS: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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint 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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