Vigie VulnDBEuropean-hosted Vulnerability DB
FR
Menu

ftrace: Fix potential warning in trace_printk_seq during ftrace_dump (Linux Linux)

CVE-2025-39813
MEDIUM 4.7

At a glance

Source
NVD
EPSS
EPSS 0.12 % · percentile 2 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Search on…

Description

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.

Weaknesses (CWE)

  • CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected d769041f865330034131525ee6a7f72eb4af2a24 < f299353e7ccbcc5c2ed8993c48fbe7609cbe729a ; affected d769041f865330034131525ee6a7f72eb4af2a24 < 5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85 ; affected d769041f865330034131525ee6a7f72eb4af2a24 < a6f0f8873cc30fd4543b09adf03f7f51d293f0e6 ; affected d769041f865330034131525ee6a7f72eb4af2a24 < e80ff23ba8bdb0f41a1afe2657078e4097d13a9a ; affected d769041f865330034131525ee6a7f72eb4af2a24 < 28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa ; affected d769041f865330034131525ee6a7f72eb4af2a24 < ced94e137e6cd5e79c65564841d3b7695d0f5fa3
Linux · Linuxaffected 2.6.28 ; unaffected 0 < 2.6.28 ; unaffected 5.4.298 ≤ 5.4.* ; unaffected 5.10.242 ≤ 5.10.* ; unaffected 5.15.191 ≤ 5.15.* ; unaffected 6.1.150 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD