CVE-2025-38008 (GCVE-0-2025-38008)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:28 – Updated: 2026-05-11 21:19
VLAI?
Title
mm/page_alloc: fix race condition in unaccepted memory handling
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 , < 98fdd2f612e949c652693f6df00442c81037776d (git)
Affected: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 , < 74953f93f47a45296cc2a3fd04e2a3202ff3fa53 (git)
Affected: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 , < 71dda1cb10702dc2859f00eb789b0502de2176a9 (git)
Affected: dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 , < fefc075182275057ce607effaa3daa9e6e3bdc73 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.92 , ≤ 6.6.* (semver)
Unaffected: 6.12.30 , ≤ 6.12.* (semver)
Unaffected: 6.14.8 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "mm/internal.h",
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    "datePublished": "2025-06-18T09:28:19.358Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2026-05-11T21:19:31.804Z",
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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. 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  }
}


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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.



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