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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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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)
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  }
}


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