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CVE-2025-39813 (GCVE-0-2025-39813)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2026-05-12 12:07
VLAI
Title
ftrace: Fix potential warning in trace_printk_seq during ftrace_dump
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix potential warning in trace_printk_seq during ftrace_dump When calling ftrace_dump_one() concurrently with reading trace_pipe, a WARN_ON_ONCE() in trace_printk_seq() can be triggered due to a race condition. The issue occurs because: CPU0 (ftrace_dump) CPU1 (reader) echo z > /proc/sysrq-trigger !trace_empty(&iter) trace_iterator_reset(&iter) <- len = size = 0 cat /sys/kernel/tracing/trace_pipe trace_find_next_entry_inc(&iter) __find_next_entry ring_buffer_empty_cpu <- all empty return NULL trace_printk_seq(&iter.seq) WARN_ON_ONCE(s->seq.len >= s->seq.size) In the context between trace_empty() and trace_find_next_entry_inc() during ftrace_dump, the ring buffer data was consumed by other readers. This caused trace_find_next_entry_inc to return NULL, failing to populate `iter.seq`. At this point, due to the prior trace_iterator_reset, both `iter.seq.len` and `iter.seq.size` were set to 0. Since they are equal, the WARN_ON_ONCE condition is triggered. Move the trace_printk_seq() into the if block that checks to make sure the return value of trace_find_next_entry_inc() is non-NULL in ftrace_dump_one(), ensuring the 'iter.seq' is properly populated before subsequent operations.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < f299353e7ccbcc5c2ed8993c48fbe7609cbe729a (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < 5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85 (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < a6f0f8873cc30fd4543b09adf03f7f51d293f0e6 (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < e80ff23ba8bdb0f41a1afe2657078e4097d13a9a (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < 28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < ced94e137e6cd5e79c65564841d3b7695d0f5fa3 (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < fbd4cf7ee4db65ef36796769fe978e9eba6f0de4 (git)
Affected: d769041f865330034131525ee6a7f72eb4af2a24 , < 4013aef2ced9b756a410f50d12df9ebe6a883e4a (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 5.4.298 , ≤ 5.4.* (semver)
Unaffected: 5.10.242 , ≤ 5.10.* (semver)
Unaffected: 5.15.191 , ≤ 5.15.* (semver)
Unaffected: 6.1.150 , ≤ 6.1.* (semver)
Unaffected: 6.6.104 , ≤ 6.6.* (semver)
Unaffected: 6.12.45 , ≤ 6.12.* (semver)
Unaffected: 6.16.5 , ≤ 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)
guessed Create a notification for this product.
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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"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": "2026-06-30T10:22:13+00:00",
      "cve": "CVE-2025-39813",
      "id": "CVE-2025-39813",
      "initial_release_date": "2025-09-16T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in ftrace due to race condition in trace_printk_seq",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39813.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:58:32Z",
      "cve": "CVE-2025-39813",
      "id": "CVE-2025-39813",
      "initial_release_date": "2025-09-16T23:24:07Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "729",
      "product_status:recommended": "551",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39813",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39813.json",
      "version": "68"
    }
  }
}



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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.