CVE-2022-49731

Local kernel crash via NULL port-info entry

Published Feb 26, 2025 · Updated May 11, 2026

NULL pointer dereference in affected Linux kernel branches starting at 2.6.22 allows local users to crash the kernel during ATA host allocation. When the ppi array begins with a NULL entry, ata_host_alloc_pinfo leaves pi as NULL instead of selecting ata_dummy_port_info and later dereferences it. Public sources do not establish how a local user can make a kernel caller supply this malformed array, so practical reachability remains undisclosed.

CVSS severity5.5
Medium
EPSS probability0.28%
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 affected Linux kernel branches starting at 2.6.22 allows local users to crash the kernel during ATA host allocation. When the ppi array begins with a NULL entry, ata_host_alloc_pinfo leaves pi as NULL instead of selecting ata_dummy_port_info and later dereferences it. Public sources do not establish how a local user can make a kernel caller supply this malformed array, so practical reachability remains undisclosed.

The record

CVE
CVE-2022-49731
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=2.6.22
  2. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <07cbdb4807d369fbda73062a91b570c4dc5ec429
  3. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <1ac5efee33f29e704226506d429b84575a5d66f8
  4. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <253334f84c81bc6a43af489f108c0bddad989eef
  5. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <36cd19e7d4e5571d77a2ed20c5b6ef50cf57734a
  6. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <a810bd5af06977a847d1f202b22d7defd5c62497
  7. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <bf476fe22aa1851bab4728e0c49025a6a0bea307
  8. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <ca4693e6e06e4fd2b240c0fec47aa2498c94848e
  9. Affected versionversion=f5cda257296fbd3683b1f568f2d94d3caaacf74d <ff128fbea720bf763fa345680dda5f050bc24a47

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.22; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <07cbdb4807d369fbda73062a91b570c4dc5ec429; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <1ac5efee33f29e704226506d429b84575a5d66f8; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <253334f84c81bc6a43af489f108c0bddad989eef; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <36cd19e7d4e5571d77a2ed20c5b6ef50cf57734a; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <a810bd5af06977a847d1f202b22d7defd5c62497; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <bf476fe22aa1851bab4728e0c49025a6a0bea307; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <ca4693e6e06e4fd2b240c0fec47aa2498c94848e; version=f5cda257296fbd3683b1f568f2d94d3caaacf74d <ff128fbea720bf763fa345680dda5f050bc24a47

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Application 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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