CVE-2022-50478

Kernel panic via unchecked superblock arithmetic

Published Oct 4, 2025 · Updated Oct 4, 2025

Out-of-bounds arithmetic in Linux kernel NILFS2 allows local users to crash the kernel by mounting a filesystem with a malformed superblock. The nilfs_sb2_bad_offset function shifts an unchecked block-size exponent and multiplies unbounded disk-layout parameters, causing an invalid shift or integer overflow. The crash requires mount access and panic_on_warn; otherwise the malformed metadata triggers a bounds warning rather than the documented panic.

CVSS severity7.1
High
EPSS probability0.17%
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 arithmetic in Linux kernel NILFS2 allows local users to crash the kernel by mounting a filesystem with a malformed superblock. The nilfs_sb2_bad_offset function shifts an unchecked block-size exponent and multiplies unbounded disk-layout parameters, causing an invalid shift or integer overflow. The crash requires mount access and panic_on_warn; otherwise the malformed metadata triggers a bounds warning rather than the documented panic.

The record

CVE
CVE-2022-50478
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1012ff77284e3bec0ec0a35a820b03ec43dec2cc
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <610a2a3d7d8be3537458a378ec69396a76c385b6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62d11ec205ef14d8acf172cfc9904fdbf200025a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0ea3df56cccd53398d0289f399f19d43136b2e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b3ba54025357440d6c4414c670984f628c6f6bf
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a6f89b10042baca218c8598d6db5a44c7e32625f
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b47f5c579c8186f7f5ab5e4254e0734ea5b7bf7a
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d464b035c0613856d012cf1704879d3ff3f057fb
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d706485dffbbbf848e681edda29c7a46ac55698c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1012ff77284e3bec0ec0a35a820b03ec43dec2cc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <610a2a3d7d8be3537458a378ec69396a76c385b6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62d11ec205ef14d8acf172cfc9904fdbf200025a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0ea3df56cccd53398d0289f399f19d43136b2e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b3ba54025357440d6c4414c670984f628c6f6bf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a6f89b10042baca218c8598d6db5a44c7e32625f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b47f5c579c8186f7f5ab5e4254e0734ea5b7bf7a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d464b035c0613856d012cf1704879d3ff3f057fb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d706485dffbbbf848e681edda29c7a46ac55698c

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

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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-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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