CVE-2022-49846

Kernel heap corruption via undersized UDF name buffer

Published May 1, 2025 · Updated Aug 5, 2026

Out-of-bounds write in the Linux kernel UDF filesystem allows local users to corrupt kernel heap memory through a crafted UDF image. udf_find_entry() allocates copy_name for a 254-byte UDF name, but memcpy can copy a 255-byte file identifier assembled across blocks, writing past the slab object. A local low-privileged user must mount the image and trigger a VFS lookup; successful exploitation can crash the host or corrupt kernel data.

CVSS severityUnavailable
Unscored
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 write in the Linux kernel UDF filesystem allows local users to corrupt kernel heap memory through a crafted UDF image. udf_find_entry() allocates copy_name for a 254-byte UDF name, but memcpy can copy a 255-byte file identifier assembled across blocks, writing past the slab object. A local low-privileged user must mount the image and trigger a VFS lookup; successful exploitation can crash the host or corrupt kernel data.

The record

CVE
CVE-2022-49846
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <03f9582a6a2ebd25a440896475c968428c4b63e7
  2. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <583fdd98d94acba1e7225e5cc29063aef0741030
  3. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <7a6051d734f1ed0031e2216f9a538621235c11a4
  4. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <ac79001b8e603226fab17240a79cb9ef679d3cd9
  5. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <c736ed8541605e3a25075bb1cbf8f38cb3083238
  6. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <c8af247de385ce49afabc3bf1cf4fd455c94bfe8
  7. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <d8971f410739a864c537e0ac29344a7b6c450232
  8. Affected versionversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <f1517721c408631f09d54c743aa70cb07fd3eebd
  9. Affected versionversion=4.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <03f9582a6a2ebd25a440896475c968428c4b63e7; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <583fdd98d94acba1e7225e5cc29063aef0741030; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <7a6051d734f1ed0031e2216f9a538621235c11a4; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <ac79001b8e603226fab17240a79cb9ef679d3cd9; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <c736ed8541605e3a25075bb1cbf8f38cb3083238; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <c8af247de385ce49afabc3bf1cf4fd455c94bfe8; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <d8971f410739a864c537e0ac29344a7b6c450232; version=066b9cded00b8e3212df74a417bb074f3f3a1fe0 <f1517721c408631f09d54c743aa70cb07fd3eebd; version=4.6

Published CVSS scores

No CVSS assessment is available in this record.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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