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 |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/btrfs/relocation.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "29d9746812d8b7c37d594f484e994fd552c3ec33",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "92bedc0455552b42ada1a1f42b0e3a8593cdfccc",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "14a8be9428435ee17f17fae7991215c246b7fd43",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "797dc567146c7e3c4f8d9680e4fbc76e0a6d9151",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "ae0629ff9ccb836416ada129f4edc7efea6eaaad",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "6a8269b6459ed870a8156c106a0f597383907872",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"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": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "5.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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": {
"epss": {
"cve": "CVE-2026-68450",
"date": "2026-10-17",
"epss": "0.00161",
"percentile": "0.04899"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/btrfs/relocation.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "29d9746812d8b7c37d594f484e994fd552c3ec33",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "92bedc0455552b42ada1a1f42b0e3a8593cdfccc",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "14a8be9428435ee17f17fae7991215c246b7fd43",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "797dc567146c7e3c4f8d9680e4fbc76e0a6d9151",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "ae0629ff9ccb836416ada129f4edc7efea6eaaad",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
},
{
"lessThan": "6a8269b6459ed870a8156c106a0f597383907872",
"status": "affected",
"version": "57a304cfd43b2b4a5b44b8f5dc026abb34183068",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"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"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8"
}
],
"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"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
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.
Loading…
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.