Vulnerability-Lookup

GHSA-WV76-PJMF-RXJC

Vulnerability from github – Published: 2025-10-22 18:30 – Updated: 2025-10-22 18:30

Details

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

zsmalloc: fix races between asynchronous zspage free and page migration

The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races.

It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process).

Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.

Severity ?

4.7 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49554"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:31Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nzsmalloc: fix races between asynchronous zspage free and page migration\n\nThe asynchronous zspage free worker tries to lock a zspage\u0027s entire page\nlist without defending against page migration.  Since pages which haven\u0027t\nyet been locked can concurrently migrate off the zspage page list while\nlock_zspage() churns away, lock_zspage() can suffer from a few different\nlethal races.\n\nIt can lock a page which no longer belongs to the zspage and unsafely\ndereference page_private(), it can unsafely dereference a torn pointer to\nthe next page (since there\u0027s a data race), and it can observe a spurious\nNULL pointer to the next page and thus not lock all of the zspage\u0027s pages\n(since a single page migration will reconstruct the entire page list, and\ncreate_page_chain() unconditionally zeroes out each list pointer in the\nprocess).\n\nFix the races by using migrate_read_lock() in lock_zspage() to synchronize\nwith page migration.",
  "id": "GHSA-wv76-pjmf-rxjc",
  "modified": "2025-10-22T18:30:32Z",
  "published": "2025-10-22T18:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49554"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49554 (GCVE-0-2022-49554)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:14 – Updated: 2025-05-04 08:40

Title

zsmalloc: fix races between asynchronous zspage free and page migration

Summary

In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3674d8a8dadd03a44…
	https://git.kernel.org/stable/c/645996efc2ae39124…
	https://git.kernel.org/stable/c/fc658c083904427ab…
	https://git.kernel.org/stable/c/fae05b2314b147a78…
	https://git.kernel.org/stable/c/3ec459c8810e65840…
	https://git.kernel.org/stable/c/8ba7b7c1dad1f6503…
	https://git.kernel.org/stable/c/c5402fb5f71f1a725…
	https://git.kernel.org/stable/c/2505a981114dcb715…

Impacted products

Vendor

Product

Version

Linux

Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 3674d8a8dadd03a447dd21069d4dacfc3399b63b (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 645996efc2ae391246d595832aaa6f9d3cc338c7 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < fc658c083904427abbf8f18280d517ee2668677c (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < fae05b2314b147a78fbed1dc4c645d9a66313758 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 3ec459c8810e658401be428d3168eacfc380bdd0 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 8ba7b7c1dad1f6503c541778f31b33f7f62eb966 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < c5402fb5f71f1a725f1e55d9c6799c0c7bec308f (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 2505a981114dcb715f8977b8433f7540854851d8 (git)

Linux

Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 4.14.282 , ≤ 4.14.* (semver)
Unaffected: 4.19.246 , ≤ 4.19.* (semver)
Unaffected: 5.4.197 , ≤ 5.4.* (semver)
Unaffected: 5.10.120 , ≤ 5.10.* (semver)
Unaffected: 5.15.45 , ≤ 5.15.* (semver)
Unaffected: 5.17.13 , ≤ 5.17.* (semver)
Unaffected: 5.18.2 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/zsmalloc.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
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            {
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            },
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          "product": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.282",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                },
                {
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                  "versionEndExcluding": "4.19.246",
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                },
                {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzsmalloc: fix races between asynchronous zspage free and page migration\n\nThe asynchronous zspage free worker tries to lock a zspage\u0027s entire page\nlist without defending against page migration.  Since pages which haven\u0027t\nyet been locked can concurrently migrate off the zspage page list while\nlock_zspage() churns away, lock_zspage() can suffer from a few different\nlethal races.\n\nIt can lock a page which no longer belongs to the zspage and unsafely\ndereference page_private(), it can unsafely dereference a torn pointer to\nthe next page (since there\u0027s a data race), and it can observe a spurious\nNULL pointer to the next page and thus not lock all of the zspage\u0027s pages\n(since a single page migration will reconstruct the entire page list, and\ncreate_page_chain() unconditionally zeroes out each list pointer in the\nprocess).\n\nFix the races by using migrate_read_lock() in lock_zspage() to synchronize\nwith page migration."
        }
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      "providerMetadata": {
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          "url": "https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758"
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        },
        {
          "url": "https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8"
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      ],
      "title": "zsmalloc: fix races between asynchronous zspage free and page migration",
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    "datePublished": "2025-02-26T02:14:02.649Z",
    "dateReserved": "2025-02-26T02:08:31.590Z",
    "dateUpdated": "2025-05-04T08:40:26.141Z",
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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-WV76-PJMF-RXJC

CVE-2022-49554 (GCVE-0-2022-49554)

Tags

Sightings

Nomenclature