CVE-2022-50381

Kernel crash via premature bio release

Published Sep 18, 2025 · Updated Sep 18, 2025

NULL pointer dereference in Linux kernel md allows local users to crash the kernel during concurrent RAID metadata flushes. In super_written and md_end_flush, pending-I/O counters are decremented before bio_put releases the bio, allowing a waiter to destroy the bioset before mempool_free uses it. The race requires local access and concurrent md RAID flush completion; the demonstrated consequence is a kernel crash, not data disclosure or code execution.

CVSS severity5.5
Medium
EPSS probability0.16%
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 Linux kernel md allows local users to crash the kernel during concurrent RAID metadata flushes. In super_written and md_end_flush, pending-I/O counters are decremented before bio_put releases the bio, allowing a waiter to destroy the bioset before mempool_free uses it. The race requires local access and concurrent md RAID flush completion; the demonstrated consequence is a kernel crash, not data disclosure or code execution.

The record

CVE
CVE-2022-50381
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <341097ee53573e06ab9fc675d96a052385b851fa
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384ef33d37cefb2ac539d44597d03f06c9b8975c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <842f222fc42a9239831e15b1fd49a51c546902cb
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91bd504128a51776472445070e11a3b0f9348c90
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97ce99984be12b9acb49ddce0f5d8ebb037adbb6
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae7793027766491c5f8635b12d15a5940d3b8698
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5be563b4356b3089b3245d024cae3f248ba7090
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf06b162f5b6337b688072a1a47941280b8f7110

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <341097ee53573e06ab9fc675d96a052385b851fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384ef33d37cefb2ac539d44597d03f06c9b8975c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <842f222fc42a9239831e15b1fd49a51c546902cb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91bd504128a51776472445070e11a3b0f9348c90; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97ce99984be12b9acb49ddce0f5d8ebb037adbb6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae7793027766491c5f8635b12d15a5940d3b8698; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5be563b4356b3089b3245d024cae3f248ba7090; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf06b162f5b6337b688072a1a47941280b8f7110

Published CVSS scores

5.5CISA ADP VulnrichmentCVSS: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.

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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-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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