CVE-2025-38282 (GCVE-0-2025-38282)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:42 – Updated: 2026-05-11 21:24
VLAI
Title
kernfs: Relax constraint in draining guard
Summary
In the Linux kernel, the following vulnerability has been resolved: kernfs: Relax constraint in draining guard The active reference lifecycle provides the break/unbreak mechanism but the active reference is not truly active after unbreak -- callers don't use it afterwards but it's important for proper pairing of kn->active counting. Assuming this mechanism is in place, the WARN check in kernfs_should_drain_open_files() is too sensitive -- it may transiently catch those (rightful) callers between kernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen Ridong: kernfs_remove_by_name_ns kernfs_get_active // active=1 __kernfs_remove // active=0x80000002 kernfs_drain ... wait_event //waiting (active == 0x80000001) kernfs_break_active_protection // active = 0x80000001 // continue kernfs_unbreak_active_protection // active = 0x80000002 ... kernfs_should_drain_open_files // warning occurs kernfs_put_active To avoid the false positives (mind panic_on_warn) remove the check altogether. (This is meant as quick fix, I think active reference break/unbreak may be simplified with larger rework.)
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 2d6a67c2b3b87808a347dc1047b520a9dd177a4f (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6c81f1c7812c61f187bed1b938f1d2e391d503ab (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 72275c888f8962b406ee9c6885c79bf68cca5a63 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 071d8e4c2a3b0999a9b822e2eb8854784a350f8a (git)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.94 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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Assuming this mechanism is in place, the WARN check in\\nkernfs_should_drain_open_files() is too sensitive -- it may transiently\\ncatch those (rightful) callers between\\nkernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen\\nRidong:\\n\\n\\tkernfs_remove_by_name_ns\\tkernfs_get_active // active=1\\n\\t__kernfs_remove\\t\\t\\t\\t\\t  // active=0x80000002\\n\\tkernfs_drain\\t\\t\\t...\\n\\twait_event\\n\\t//waiting (active == 0x80000001)\\n\\t\\t\\t\\t\\tkernfs_break_active_protection\\n\\t\\t\\t\\t\\t// active = 0x80000001\\n\\t// continue\\n\\t\\t\\t\\t\\tkernfs_unbreak_active_protection\\n\\t\\t\\t\\t\\t// active = 0x80000002\\n\\t...\\n\\tkernfs_should_drain_open_files\\n\\t// warning occurs\\n\\t\\t\\t\\t\\tkernfs_put_active\\n\\nTo avoid the false positives (mind panic_on_warn) remove the check altogether.\\n(This is meant as quick fix, I think active reference break/unbreak may be\\nsimplified with larger rework.)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kernfs: relajar restricci\u00f3n en el drenaje de la protecci\u00f3n El ciclo de vida de la referencia activa proporciona el mecanismo de interrupci\u00f3n/desconexi\u00f3n, pero la referencia activa no est\u00e1 verdaderamente activa despu\u00e9s de la conexi\u00f3n; los llamadores no la usan despu\u00e9s, pero es importante para el emparejamiento adecuado del conteo kn-\u0026gt;activo. 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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.