btrfs: free mapping node on duplicate reloc root insert

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68450
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 01:17:07 UTC
Updated2026-08-12 01:17:07 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 92bedc0455552b42ada1a1f42b0e3a8593cdfccc git Not specified
CNA Linux Linux affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 14a8be9428435ee17f17fae7991215c246b7fd43 git Not specified
CNA Linux Linux affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 git Not specified
CNA Linux Linux affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ae0629ff9ccb836416ada129f4edc7efea6eaaad git Not specified
CNA Linux Linux affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 6a8269b6459ed870a8156c106a0f597383907872 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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