CVE-2025-21853 (GCVE-0-2025-21853)

Vulnerability from cvelistv5 – Published: 2025-03-12 09:42 – Updated: 2026-07-14 12:40
VLAI
Title
bpf: avoid holding freeze_mutex during mmap operation
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/
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: fc9702273e2edb90400a34b3be76f7b08fa3344b , < 2ce31c97c219b4fe797749f950274f246eb88c49 (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < 0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < 4759acbd44d24a69b7b14848012ec4201d6c5501 (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < 29cfda62ab4d92ab94123813db49ab76c1e61b29 (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4 (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < 271e49f8a58edba65bc2b1250a0abaa98c4bfdbe (git)
Affected: fc9702273e2edb90400a34b3be76f7b08fa3344b , < bc27c52eea189e8f7492d40739b7746d67b65beb (git)
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Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.80 , ≤ 6.6.* (semver)
Unaffected: 6.12.17 , ≤ 6.12.* (semver)
Unaffected: 6.13.5 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:03:51+00:00",
      "cve": "CVE-2025-21853",
      "id": "CVE-2025-21853",
      "initial_release_date": "2025-03-12T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: avoid holding freeze_mutex during mmap operation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21853.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.