CVE-2026-68450 (GCVE-0-2026-68450)
Vulnerability from cvelistv5 – Published: 2026-08-12 00:51 – Updated: 2026-08-19 16:35
VLAI
EPSS
VEX
Title
btrfs: free mapping node on duplicate reloc root insert
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.
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < 29d9746812d8b7c37d594f484e994fd552c3ec33
(git)
Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8 (git) Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < 92bedc0455552b42ada1a1f42b0e3a8593cdfccc (git) Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < 14a8be9428435ee17f17fae7991215c246b7fd43 (git) Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 (git) Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < ae0629ff9ccb836416ada129f4edc7efea6eaaad (git) Affected: 57a304cfd43b2b4a5b44b8f5dc026abb34183068 , < 6a8269b6459ed870a8156c106a0f597383907872 (git) |
guessed | |
| Linux | Linux |
Affected:
5.13
Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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"product": "Linux",
"programFiles": [
"fs/btrfs/relocation.c"
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"versionType": "git"
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},
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"product": "Linux",
"programFiles": [
"fs/btrfs/relocation.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"lessThan": "5.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
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"vulnerable": true
},
{
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},
{
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},
{
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},
{
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: free mapping node on duplicate reloc root insert\n\n__add_reloc_root() allocates a mapping_node before inserting it into\nrc-\u003ereloc_root_tree. If rb_simple_insert() finds an existing entry, it\nreturns the existing rb_node and leaves the newly allocated node unlinked.\n\nThe error path then returns -EEXIST without freeing the new node. Since\nthe node was never inserted into reloc_root_tree, the later cleanup in\nput_reloc_control() cannot find it either.\n\nFree the newly allocated node before returning -EEXIST.\n\nThe callers currently assert that -EEXIST should not happen, so this is a\ndefensive cleanup for an unexpected duplicate insert path. If the path is\never reached, the local allocation should still be released."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:35:45.490Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33"
},
{
"url": "https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8"
},
{
"url": "https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc"
},
{
"url": "https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43"
},
{
"url": "https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151"
},
{
"url": "https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad"
},
{
"url": "https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872"
}
],
"title": "btrfs: free mapping node on duplicate reloc root insert",
"x_generator": {
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}
}
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"cveMetadata": {
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"cveId": "CVE-2026-68450",
"datePublished": "2026-08-12T00:51:48.970Z",
"dateReserved": "2026-07-30T09:28:09.395Z",
"dateUpdated": "2026-08-19T16:35:45.490Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-10-04",
"epss": "0.00161",
"percentile": "0.04681"
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],
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{
"lessThanOrEqual": "6.18.*",
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},
{
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"version": "7.1.6",
"versionType": "semver"
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"lessThanOrEqual": "*",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: free mapping node on duplicate reloc root insert\n\n__add_reloc_root() allocates a mapping_node before inserting it into\nrc-\u003ereloc_root_tree. If rb_simple_insert() finds an existing entry, it\nreturns the existing rb_node and leaves the newly allocated node unlinked.\n\nThe error path then returns -EEXIST without freeing the new node. Since\nthe node was never inserted into reloc_root_tree, the later cleanup in\nput_reloc_control() cannot find it either.\n\nFree the newly allocated node before returning -EEXIST.\n\nThe callers currently assert that -EEXIST should not happen, so this is a\ndefensive cleanup for an unexpected duplicate insert path. If the path is\never reached, the local allocation should still be released."
}
],
"id": "CVE-2026-68450",
"lastModified": "2026-08-19T17:20:50.807",
"metrics": {},
"published": "2026-08-12T01:17:07.930",
"references": [
{
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-09-29T14:40:49+00:00",
"cve": "CVE-2026-68450",
"id": "CVE-2026-68450",
"initial_release_date": "2026-08-12T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "63",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: btrfs: free mapping node on duplicate reloc root insert",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68450.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:30:57Z",
"cve": "CVE-2026-68450",
"id": "CVE-2026-68450",
"initial_release_date": "2026-08-12T16:21:38Z",
"product_status:known_affected": "590",
"product_status:known_not_affected": "89",
"product_status:recommended": "275",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68450",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68450.json",
"version": "12"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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