CVE-2026-43041

Description

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/20260225071623.41275-1-jiayuan.chen@linux.dev/T/

References

• https://git.kernel.org/stable/c/0fda873092b541bb5a9b87d728a2429f863f8cfa
• https://git.kernel.org/stable/c/2428083101f6883f979cceffa76cd8440751ffe6
• https://git.kernel.org/stable/c/4b75ff0aedd6ade1018ad4a3a9d8336794e36e42
• https://git.kernel.org/stable/c/5d2249eefaca59908fe3c264b8eca526424dcfbe
• https://git.kernel.org/stable/c/69402908e277dd164bf8d7c8fd0513c0fac28e9e