CVE-2022-50752

Kernel memory corruption via duplicate bio release

Published Dec 24, 2025 · Updated Dec 24, 2025

Double-free in the Linux kernel md/raid5 subsystem allows local users to corrupt kernel memory through reads from RAID5/6 arrays with bad blocks. In raid5_read_one_chunk(), the is_badblock() error path calls bio_put() on raid_bio before the common I/O completion path releases the same bio again. Reachability requires an affected kernel and an accessible, non-degraded md RAID5/6 array containing a bad block; triggering the path can crash the kernel or enable heap corruption.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in the Linux kernel md/raid5 subsystem allows local users to corrupt kernel memory through reads from RAID5/6 arrays with bad blocks. In raid5_read_one_chunk(), the is_badblock() error path calls bio_put() on raid_bio before the common I/O completion path releases the same bio again. Reachability requires an affected kernel and an accessible, non-degraded md RAID5/6 array containing a bad block; triggering the path can crash the kernel or enable heap corruption.

The record

CVE
CVE-2022-50752
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=5.14
  2. Affected versionversion=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <21a9c7354aa59e97e26ece5f0a609c8bfa43020d
  3. Affected versionversion=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <7a37c58ee72e1fadd22c4ee990cb74c2ca2280e7
  4. Affected versionversion=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <c0fd5d4d8fd7b1a50306d7a23c720cf808f41fdf
  5. Affected versionversion=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <c66a6f41e09ad386fd2cce22b9cded837bbbc704

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <21a9c7354aa59e97e26ece5f0a609c8bfa43020d; version=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <7a37c58ee72e1fadd22c4ee990cb74c2ca2280e7; version=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <c0fd5d4d8fd7b1a50306d7a23c720cf808f41fdf; version=c82aa1b76787c34fd02374e519b6f52cdeb2f54b <c66a6f41e09ad386fd2cce22b9cded837bbbc704

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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.

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Technologies

Your stack

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Your stack

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