Vulnerability-Lookup

GHSA-VM29-JH4P-X8CP

Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-05-07 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

cxl/region: Fix decoder allocation crash

When an intermediate port's decoders have been exhausted by existing regions, and creating a new region with the port in question in it's hierarchical path is attempted, cxl_port_attach_region() fails to find a port decoder (as would be expected), and drops into the failure / cleanup path.

However, during cleanup of the region reference, a sanity check attempts to dereference the decoder, which in the above case didn't exist. This causes a NULL pointer dereference BUG.

To fix this, refactor the decoder allocation and de-allocation into helper routines, and in this 'free' routine, check that the decoder, @cxld, is valid before attempting any operations on it.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fix decoder allocation crash\n\nWhen an intermediate port\u0027s decoders have been exhausted by existing\nregions, and creating a new region with the port in question in it\u0027s\nhierarchical path is attempted, cxl_port_attach_region() fails to find a\nport decoder (as would be expected), and drops into the failure / cleanup\npath.\n\nHowever, during cleanup of the region reference, a sanity check attempts\nto dereference the decoder, which in the above case didn\u0027t exist. This\ncauses a NULL pointer dereference BUG.\n\nTo fix this, refactor the decoder allocation and de-allocation into\nhelper routines, and in this \u0027free\u0027 routine, check that the decoder,\n@cxld, is valid before attempting any operations on it.",
  "id": "GHSA-vm29-jh4p-x8cp",
  "modified": "2025-05-07T15:31:26Z",
  "published": "2025-05-01T15:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49895"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71ee71d7adcba648077997a29a91158d20c40b09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6813b5610ac53af73edd87a660d23a0511faa47"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49895 (GCVE-0-2022-49895)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2025-10-01 16:02

Title

cxl/region: Fix decoder allocation crash

Summary

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix decoder allocation crash When an intermediate port's decoders have been exhausted by existing regions, and creating a new region with the port in question in it's hierarchical path is attempted, cxl_port_attach_region() fails to find a port decoder (as would be expected), and drops into the failure / cleanup path. However, during cleanup of the region reference, a sanity check attempts to dereference the decoder, which in the above case didn't exist. This causes a NULL pointer dereference BUG. To fix this, refactor the decoder allocation and de-allocation into helper routines, and in this 'free' routine, check that the decoder, @cxld, is valid before attempting any operations on it.

Severity ?

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-476 - NULL Pointer Dereference

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/c6813b5610ac53af7…
	https://git.kernel.org/stable/c/71ee71d7adcba6480…

Impacted products

Vendor

Product

Version

Linux

Affected: 384e624bb211b406db40edc900bb51af8bb267d0 , < c6813b5610ac53af73edd87a660d23a0511faa47 (git)
Affected: 384e624bb211b406db40edc900bb51af8bb267d0 , < 71ee71d7adcba648077997a29a91158d20c40b09 (git)

Linux

Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.0.8 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "content": {
                "id": "CVE-2022-49895",
                "options": [
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                "timestamp": "2025-10-01T16:02:07.580579Z",
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        "problemTypes": [
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    "datePublished": "2025-05-01T14:10:37.707Z",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VM29-JH4P-X8CP

CVE-2022-49895 (GCVE-0-2022-49895)

Tags

Sightings

Nomenclature