CVE-2022-50864

Kernel panic via oversized NILFS2 block exponent

Published Dec 30, 2025 · Updated Dec 30, 2025

Shift-out-of-bounds in Linux NILFS2 allows attackers to panic the kernel by mounting a filesystem with a corrupted superblock. The init_nilfs() and load_nilfs() paths shift a 32-bit integer by the unvalidated s_log_block_size exponent while deriving the filesystem block size. Triggering a panic requires mounting crafted NILFS2 media and enabling panic_on_warn; otherwise the operation emits a warning.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
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 NILFS2 allows attackers to panic the kernel by mounting a filesystem with a corrupted superblock. The init_nilfs() and load_nilfs() paths shift a 32-bit integer by the unvalidated s_log_block_size exponent while deriving the filesystem block size. Triggering a panic requires mounting crafted NILFS2 media and enabling panic_on_warn; otherwise the operation emits a warning.

The record

CVE
CVE-2022-50864
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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 <8b6ef451b5701b37d9a5905534595776a662edfc
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a16731fa1b96226c75bbf18e73513b14fc318360
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ddb6615a168f97b91175e00eda4c644741cf531c
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ebeccaaef67a4895d2496ab8d9c2fb8d89201211
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ec93b5430ec0f60877a5388bb023d60624f9ab9f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b6ef451b5701b37d9a5905534595776a662edfc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a16731fa1b96226c75bbf18e73513b14fc318360; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ddb6615a168f97b91175e00eda4c644741cf531c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ebeccaaef67a4895d2496ab8d9c2fb8d89201211; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ec93b5430ec0f60877a5388bb023d60624f9ab9f

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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