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CVE-2026-31541: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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 state does not change and the synchronization is never called, leaving a possible UAF bug. Move the clearing of all flags below the updating of the copy_trace_marker option which then makes sure the synchronization is performed. Also use the flag for checking the state in update_marker_trace() instead of looking at if the list is empty.

    Засегнати продукти

    • Linux Linux: 7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 преди 75668e58244e63ec3785098a02e1cdcff14a6c2e; 7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 преди cc267e4b4302247dc67ef937a9ac587a696a43c1; 7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 преди 07183aac4a6828e474f00b37c9d795d0d99e18a7
    • Linux Linux: 6.16; преди 6.16; 6.18.20 до 6.18.*; 6.19.10 до 6.19.*; от 7.0 нататък

    История

    • 24 април 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31541: Linux | freedomonline.bg