CVE-2026-68450

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux57a304cfd43b2b4a5b44b8f5dc026abb34183068 < 92bedc0455552b42ada1a1f42b0e3a8593cdfcccaffected
LinuxLinux57a304cfd43b2b4a5b44b8f5dc026abb34183068 < 14a8be9428435ee17f17fae7991215c246b7fd43affected
LinuxLinux57a304cfd43b2b4a5b44b8f5dc026abb34183068 < 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151affected
LinuxLinux57a304cfd43b2b4a5b44b8f5dc026abb34183068 < ae0629ff9ccb836416ada129f4edc7efea6eaaadaffected
LinuxLinux57a304cfd43b2b4a5b44b8f5dc026abb34183068 < 6a8269b6459ed870a8156c106a0f597383907872affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References