github - ghsa-vm29-jh4p-x8cp

ghsa-vm29-jh4p-x8cp

Vulnerability from github

Published

2025-05-01 15:31

Modified

2025-05-01 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.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49895"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:14Z",
    "severity": null
  },
  "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": "2025-05-01T15:31:51Z",
  "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": []
}

cve-2022-49895

Vulnerability from cvelistv5

Published

2025-05-01 14:10

Modified

2025-05-04 08:47

Severity ?

Summary

cxl/region: Fix decoder allocation crash

References

▼	URL	Tags
	https://git.kernel.org/stable/c/c6813b5610ac53af73edd87a660d23a0511faa47
	https://git.kernel.org/stable/c/71ee71d7adcba648077997a29a91158d20c40b09

Impacted products

▼	Vendor	Product
	Linux	Linux
	Linux	Linux

Show details on NVD website

To clipboard

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    "datePublished": "2025-05-01T14:10:37.707Z",
    "dateReserved": "2025-05-01T14:05:17.243Z",
    "dateUpdated": "2025-05-04T08:47:59.142Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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