CVE-2022-50755

Local host compromise via double buffer release

Published Dec 24, 2025 · Updated Dec 24, 2025

Improper buffer release in the Linux kernel UDF filesystem allows local users to crash or compromise the host through a crafted rename. When udf_find_entry() returns NULL, it releases both ofibh.sbh and ofibh.ebh, but udf_rename() releases the same buffer heads again and unbalances b_count. Exploitation requires local rename access on a mounted, attacker-crafted UDF filesystem; the resulting use-after-free enables kernel memory disclosure, corruption, or panic.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper buffer release in the Linux kernel UDF filesystem allows local users to crash or compromise the host through a crafted rename. When udf_find_entry() returns NULL, it releases both ofibh.sbh and ofibh.ebh, but udf_rename() releases the same buffer heads again and unbalances b_count. Exploitation requires local rename access on a mounted, attacker-crafted UDF filesystem; the resulting use-after-free enables kernel memory disclosure, corruption, or panic.

The record

CVE
CVE-2022-50755
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <090bf49833c51da297ec74f98ad2bf44daea9311
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <156d440dea97deada629bb51cb17887abd862605
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40dba68d418237b1ae2beaa06d46a94dd946278e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fca09045509f5bde8fc28e68fbca38cb4bdcf2e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78eba2778ae10fb2a9d450e14d26eb6f6bf1f906
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9d2cad69547abea961fa80426d600b861de1952b
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c791730f2554a9ebb8f18df9368dc27d4ebc38c2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6da7ec0f94f5208c848e0e94b70f54a0bd9c587
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7a6a53c871460727be09f4414ccb29fb8697526

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <090bf49833c51da297ec74f98ad2bf44daea9311; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <156d440dea97deada629bb51cb17887abd862605; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40dba68d418237b1ae2beaa06d46a94dd946278e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fca09045509f5bde8fc28e68fbca38cb4bdcf2e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78eba2778ae10fb2a9d450e14d26eb6f6bf1f906; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9d2cad69547abea961fa80426d600b861de1952b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c791730f2554a9ebb8f18df9368dc27d4ebc38c2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6da7ec0f94f5208c848e0e94b70f54a0bd9c587; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7a6a53c871460727be09f4414ccb29fb8697526

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

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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