CVE-2025-38008 (GCVE-0-2025-38008)
Vulnerability from cvelistv5
Published
2025-06-18 09:28
Modified
2025-06-18 09:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: fix race condition in unaccepted memory handling The page allocator tracks the number of zones that have unaccepted memory using static_branch_enc/dec() and uses that static branch in hot paths to determine if it needs to deal with unaccepted memory. Borislav and Thomas pointed out that the tracking is racy: operations on static_branch are not serialized against adding/removing unaccepted pages to/from the zone. Sanity checks inside static_branch machinery detects it: WARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 The comment around the WARN() explains the problem: /* * Warn about the '-1' case though; since that means a * decrement is concurrent with a first (0->1) increment. IOW * people are trying to disable something that wasn't yet fully * enabled. This suggests an ordering problem on the user side. */ The effect of this static_branch optimization is only visible on microbenchmark. Instead of adding more complexity around it, remove it altogether.
References
Impacted products
Vendor Product Version
Linux Linux Version: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6
Version: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6
Version: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6
Version: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/internal.h",
            "mm/mm_init.c",
            "mm/page_alloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "98fdd2f612e949c652693f6df00442c81037776d",
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              "versionType": "git"
            },
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/internal.h",
            "mm/mm_init.c",
            "mm/page_alloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.92",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.30",
                  "versionStartIncluding": "6.5",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.8",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: fix race condition in unaccepted memory handling\n\nThe page allocator tracks the number of zones that have unaccepted memory\nusing static_branch_enc/dec() and uses that static branch in hot paths to\ndetermine if it needs to deal with unaccepted memory.\n\nBorislav and Thomas pointed out that the tracking is racy: operations on\nstatic_branch are not serialized against adding/removing unaccepted pages\nto/from the zone.\n\nSanity checks inside static_branch machinery detects it:\n\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\n\nThe comment around the WARN() explains the problem:\n\n\t/*\n\t * Warn about the \u0027-1\u0027 case though; since that means a\n\t * decrement is concurrent with a first (0-\u003e1) increment. IOW\n\t * people are trying to disable something that wasn\u0027t yet fully\n\t * enabled. This suggests an ordering problem on the user side.\n\t */\n\nThe effect of this static_branch optimization is only visible on\nmicrobenchmark.\n\nInstead of adding more complexity around it, remove it altogether."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:28:19.358Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d"
        },
        {
          "url": "https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53"
        },
        {
          "url": "https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73"
        }
      ],
      "title": "mm/page_alloc: fix race condition in unaccepted memory handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38008",
    "datePublished": "2025-06-18T09:28:19.358Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2025-06-18T09:28:19.358Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38008\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:32.037\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/page_alloc: fix race condition in unaccepted memory handling\\n\\nThe page allocator tracks the number of zones that have unaccepted memory\\nusing static_branch_enc/dec() and uses that static branch in hot paths to\\ndetermine if it needs to deal with unaccepted memory.\\n\\nBorislav and Thomas pointed out that the tracking is racy: operations on\\nstatic_branch are not serialized against adding/removing unaccepted pages\\nto/from the zone.\\n\\nSanity checks inside static_branch machinery detects it:\\n\\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\\n\\nThe comment around the WARN() explains the problem:\\n\\n\\t/*\\n\\t * Warn about the \u0027-1\u0027 case though; since that means a\\n\\t * decrement is concurrent with a first (0-\u003e1) increment. IOW\\n\\t * people are trying to disable something that wasn\u0027t yet fully\\n\\t * enabled. This suggests an ordering problem on the user side.\\n\\t */\\n\\nThe effect of this static_branch optimization is only visible on\\nmicrobenchmark.\\n\\nInstead of adding more complexity around it, remove it altogether.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/page_alloc: arregla la condici\u00f3n de ejecuci\u00f3n en el manejo de memoria no aceptada El asignador de p\u00e1ginas rastrea el n\u00famero de zonas que tienen memoria no aceptada usando static_branch_enc/dec() y usa esa rama est\u00e1tica en rutas activas para determinar si necesita lidiar con memoria no aceptada. Borislav y Thomas se\u00f1alaron que el rastreo es acelerado: las operaciones en static_branch no se serializan contra la adici\u00f3n/eliminaci\u00f3n de p\u00e1ginas no aceptadas a/desde la zona. Las comprobaciones de cordura dentro de la maquinaria static_branch lo detectan: ADVERTENCIA: CPU: 0 PID: 10 en kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 El comentario alrededor de WARN() explica el problema: /* * Sin embargo, advierte sobre el caso \u0027-1\u0027; ya que eso significa que un * decremento es concurrente con un primer incremento (0-\u0026gt;1). Es decir, * se est\u00e1 intentando deshabilitar algo que a\u00fan no estaba completamente habilitado. Esto sugiere un problema de ordenamiento del usuario. */ El efecto de esta optimizaci\u00f3n de static_branch solo es visible en microbenchmark. En lugar de a\u00f1adir m\u00e1s complejidad, elim\u00ednenla por completo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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