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CVE-2025-39736 (GCVE-0-2025-39736)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-05-12 12:06
VLAI
Title
mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.
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: c5665868183fec689dbab9fb8505188b2c4f0757 , < c7b6ea0ede687e7460e593c5ea478f50aa41682a (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 4b0151e1d468eb2667c37b7af99b3c075072d334 (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < f249d32bb54876b4b6c3ae071af8ddca77af390b (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 62879faa8efe8d8a9c7bf7606ee9c068012d7dac (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < a0854de00ce2ee27edf39037e7836ad580eb3350 (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 08f70be5e406ce47c822f2dd11c1170ca259605b (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < a181b228b37a6a5625dad2bb4265bb7abb673e9f (git)
Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:33:46+00:00",
      "cve": "CVE-2025-39736",
      "id": "CVE-2025-39736",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39736.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T01:48:38Z",
      "cve": "CVE-2025-39736",
      "id": "CVE-2025-39736",
      "initial_release_date": "2025-09-11T23:24:34Z",
      "product_status:known_not_affected": "459",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39736",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39736.json",
      "version": "17"
    }
  }
}



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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

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.