CVE-2026-68450 - btrfs: free mapping node on duplicate reloc root insert

CVE-2026-68450 - btrfs: free mapping node on duplicate reloc root insert

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/12/2026 - 04:25
CVE ID :CVE-2026-68450
Published : Aug. 12, 2026, 12:51 a.m. | 36 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: btrfs: free mapping node on duplicate reloc root insert __add_reloc_root() allocates a mapping_node before inserting it into rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it returns the existing rb_node and leaves the newly allocated node unlinked. The error path then returns -EEXIST without freeing the new node. Since the node was never inserted into reloc_root_tree, the later cleanup in put_reloc_control() cannot find it either. Free the newly allocated node before returning -EEXIST. The callers currently assert that -EEXIST should not happen, so this is a defensive cleanup for an unexpected duplicate insert path. If the path is ever reached, the local allocation should still be released.
Severity: 0.0 | NA
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