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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 CPE status
Linux Linux Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 2d6a67c2b3b87808a347dc1047b520a9dd177a4f (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6c81f1c7812c61f187bed1b938f1d2e391d503ab (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 72275c888f8962b406ee9c6885c79bf68cca5a63 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 071d8e4c2a3b0999a9b822e2eb8854784a350f8a (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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Suponiendo que este mecanismo est\u00e1 en su lugar, la comprobaci\u00f3n WARN en kernfs_should_drain_open_files() es demasiado sensible - puede atrapar transitoriamente a aquellos llamadores (leg\u00edtimos) entre kernfs_unbreak_active_protection() y kernfs_put_active() como descubri\u00f3 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 // continuar kernfs_unbreak_active_protection // active = 0x80000002 ... kernfs_should_drain_open_files // ocurre una advertencia kernfs_put_active Para evitar los falsos positivos (tenga en cuenta \\\"panic_on_warn\\\"), elimine la comprobaci\u00f3n por completo. 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      "source": "Red Hat CSAF VEX",
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      "cve": "CVE-2025-38282",
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      "status": "interim",
      "title": "SUSE CVE CVE-2025-38282",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38282.json",
      "version": "13"
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}



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