CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < 29d9746812d8b7c37d594f484e994fd552c3ec33 (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8 (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < 92bedc0455552b42ada1a1f42b0e3a8593cdfccc (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < 14a8be9428435ee17f17fae7991215c246b7fd43 (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < ae0629ff9ccb836416ada129f4edc7efea6eaaad (affected, git) ≥ 57a304cfd43b2b4a5b44b8f5dc026abb34183068; < 6a8269b6459ed870a8156c106a0f597383907872 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
5.13 (affected) ≥ 0; < 5.13 (unaffected, semver) ≥ 5.15.216; ≤ 5.15.* (unaffected, semver) ≥ 6.1.183; ≤ 6.1.* (unaffected, semver) ≥ 6.6.148; ≤ 6.6.* (unaffected, semver) ≥ 6.12.101; ≤ 6.12.* (unaffected, semver) ≥ 6.18.42; ≤ 6.18.* (unaffected, semver) ≥ 7.1.6; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33CNA: Linux
- https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8CNA: Linux
- https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfcccCNA: Linux
- https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43CNA: Linux
- https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151CNA: Linux
- https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaadCNA: Linux
- https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872CNA: Linux
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