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CVE-2021-47435 is a race condition in the Linux kernel device-mapper subsystem during I/O completion and concurrent device-mapper table replacement. The I/O completion path invoked end_io_acct() before freeing the associated dm_io object and decrementing the in-flight pending count. This ordering could wake a table-swap path, allowing it to suspend the target, replace the table, and destroy its mempools before the completion path subsequently invoked free_io(). The resulting call to mempool_free() dereferences a cleared mempool element pointer, causing a kernel NULL-pointer dereference.
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A Linux kernel vulnerability addressed by this advisory; technical details are not provided in the content.
A Linux kernel vulnerability referenced as addressed by this Red Hat Enterprise Linux 8.4 kernel update; no technical details are provided in the content.
A Linux kernel vulnerability addressed by this Red Hat Enterprise Linux 8.2 kernel security update; the content provides no further details.
A Linux kernel device-mapper (dm) race condition that can trigger a NULL-pointer dereference during I/O completion, causing a local denial-of-service kernel crash. Red Hat rates it Moderate (CVSS 3.1: 5.5); it requires low privileges and has high availability impact.
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Cross-references every affected SKU, including bundled OEM variants.
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