Vulnerability-Lookup

GHSA-3VRH-9V2M-F8XC

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 18:31

Details

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

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference.

Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode.

Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

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-2022-49989"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:26Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/privcmd: fix error exit of privcmd_ioctl_dm_op()\n\nThe error exit of privcmd_ioctl_dm_op() is calling unlock_pages()\npotentially with pages being NULL, leading to a NULL dereference.\n\nAdditionally lock_pages() doesn\u0027t check for pin_user_pages_fast()\nhaving been completely successful, resulting in potentially not\nlocking all pages into memory. This could result in sporadic failures\nwhen using the related memory in user mode.\n\nFix all of that by calling unlock_pages() always with the real number\nof pinned pages, which will be zero in case pages being NULL, and by\nchecking the number of pages pinned by pin_user_pages_fast() matching\nthe expected number of pages.",
  "id": "GHSA-3vrh-9v2m-f8xc",
  "modified": "2025-11-14T18:31:23Z",
  "published": "2025-06-18T12:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49989"
    },
    {
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      "url": "https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54"
    }
  ],
  "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-2022-49989 (GCVE-0-2022-49989)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-05-11 19:10

Title

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

Summary

In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmd_ioctl_dm_op() The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference. Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode. Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6de50db104af0dc92…
https://git.kernel.org/stable/c/c2b7bae7c90051fd6…
https://git.kernel.org/stable/c/45d47bd9b96e7874b…
https://git.kernel.org/stable/c/c5deb27895e017a02…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 6de50db104af0dc921f593fd95c55db86a52ceef (git) Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c2b7bae7c90051fd6a679d5dee00400d67ebbf4a (git) Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 (git) Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c5deb27895e017a0267de0a20d140ad5fcc55a54 (git)
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.140 , ≤ 5.10.* (semver) Unaffected: 5.15.64 , ≤ 5.15.* (semver) Unaffected: 5.19.6 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix)

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JSON

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{
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          "programFiles": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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