CVE-2026-43041

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak

__radix_tree_create() allocates and links intermediate nodes into the tree one by one. If a subsequent allocation fails, the already-linked nodes remain in the tree with no corresponding leaf entry. These orphaned internal nodes are never reclaimed because radix_tree_for_each_slot() only visits slots containing leaf values.

The radix_tree API is deprecated in favor of xarray. As suggested by Matthew Wilcox, migrate qrtr_tx_flow from radix_tree to xarray instead of fixing the radix_tree itself [1]. xarray properly handles cleanup of internal nodes — xa_destroy() frees all internal xarray nodes when the qrtr_node is released, preventing the leak.

[1] https://lore.kernel.org/all/[email protected]/T/

Affected product:

AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , TuxCare 9.6 ESU , Ubuntu 20.04 ELS

Affected packages:

linux @ 5.4.0 (+4 more)

Live-patch status from KernelCare for each operating system.