CVE-2026-31541
HighSummary
W jądrze Linuxa naprawiono podatność związaną z aktualizacjami listy powiązań trace_marker. Gdy opcja 'copy_trace_marker' jest włączona, dane zapisywane w /sys/kernel/tracing/trace_marker są kopiowane do bufora instancji, co może prowadzić do problemów przy usuwaniu instancji.
Risk Assessment
Podatność ta może prowadzić do nieprawidłowego zarządzania pamięcią i potencjalnych wycieków danych, co stanowi zagrożenie dla integralności systemu i bezpieczeństwa danych w organizacji.
Recommendation
Zaleca się aktualizację jądra Linuxa do najnowszej wersji, aby usunąć tę podatność oraz monitorowanie konfiguracji opcji trace_marker w systemie.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix trace_marker copy link list updates When the "copy_trace_marker" option is enabled for an instance, anything written into /sys/kernel/tracing/trace_marker is also copied into that instances buffer. When the option is set, that instance's trace_array descriptor is added to the marker_copies link list. This list is protected by RCU, as all iterations uses an RCU protected list traversal. When the instance is deleted, all the flags that were enabled are cleared. This also clears the copy_trace_marker flag and removes the trace_array descriptor from the list. The issue is after the flags are called, a direct call to update_marker_trace() is performed to clear the flag. This function returns true if the state of the flag changed and false otherwise. If it returns true here, synchronize_rcu() is called to make sure all readers see that its removed from the list. But since the flag was already cleared, the s
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

