CVE-2026-68450
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.
How to fix
- Linux Linux29d9746812d8b7c37d594f484e994fd552c3ec33, b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8, 92bedc0455552b42ada1a1f42b0e3a8593cdfccc, 14a8be9428435ee17f17fae7991215c246b7fd43, 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151, ae0629ff9ccb836416ada129f4edc7efea6eaaad, 6a8269b6459ed870a8156c106a0f597383907872 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < 29d9746812d8b7c37d594f484e994fd552c3ec33, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < 92bedc0455552b42ada1a1f42b0e3a8593cdfccc, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < 14a8be9428435ee17f17fae7991215c246b7fd43, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < ae0629ff9ccb836416ada129f4edc7efea6eaaad, 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ≤ v < 6a8269b6459ed870a8156c106a0f597383907872, 5.13 | 29d9746812d8b7c37d594f484e994fd552c3ec33, b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8, 92bedc0455552b42ada1a1f42b0e3a8593cdfccc, 14a8be9428435ee17f17fae7991215c246b7fd43, 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151, ae0629ff9ccb836416ada129f4edc7efea6eaaad, 6a8269b6459ed870a8156c106a0f597383907872 |
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