{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46107", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.098Z", "datePublished": "2026-05-28T09:35:13.051Z", "dateUpdated": "2026-06-01T16:18:26.337Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-01T16:18:26.337Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-thin: fix metadata refcount underflow\n\nThere's a bug in dm-thin in the function rebalance_children. If the\ninternal btree node has one entry, the code tries to copy all btree\nentries from the node's child to the node itself and then decrement the\nchild's reference count.\n\nIf the child node is shared (it has reference count > 1), we won't free\nit, so there would be two pointers to each of the grandchildren nodes.\nBut the reference counts of the grandchildren is not increased, thus the\nreference count doesn't match the number of pointers that point to the\ngrandchildren. This results in \"device mapper: space map common: unable\nto decrement block\" errors.\n\nFix this bug by incrementing reference counts on the grandchildren if the\nbtree node is shared."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/persistent-data/dm-btree-remove.c"], "versions": [{"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "f49b41c9eb7c6ff00df27cd49cea210abbadd8ad", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "f06f6aededd792a754cd677c02b3d3016d868c2c", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "12161e03d33afce781f68fa11cc6060538862fad", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "323d252a4a378834e4fe68298ca61cfc5dd3a460", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "85311a585a26640760cd0f3349ab9f2905691044", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "5ec0debbcfd43596e32c1239e993de06a704e04c", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "09a65adc7d8bbfce06392cb6d375468e2728ead5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/persistent-data/dm-btree-remove.c"], "versions": [{"version": "3.2", "status": "affected"}, {"version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.1-rc2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f49b41c9eb7c6ff00df27cd49cea210abbadd8ad"}, {"url": "https://git.kernel.org/stable/c/f06f6aededd792a754cd677c02b3d3016d868c2c"}, {"url": "https://git.kernel.org/stable/c/12161e03d33afce781f68fa11cc6060538862fad"}, {"url": "https://git.kernel.org/stable/c/323d252a4a378834e4fe68298ca61cfc5dd3a460"}, {"url": "https://git.kernel.org/stable/c/85311a585a26640760cd0f3349ab9f2905691044"}, {"url": "https://git.kernel.org/stable/c/5ec0debbcfd43596e32c1239e993de06a704e04c"}, {"url": "https://git.kernel.org/stable/c/09a65adc7d8bbfce06392cb6d375468e2728ead5"}], "title": "dm-thin: fix metadata refcount underflow", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-thin: fix metadata refcount underflow\n\nThere's a bug in dm-thin in the function rebalance_children. If the\ninternal btree node has one entry, the code tries to copy all btree\nentries from the node's child to the node itself and then decrement the\nchild's reference count.\n\nIf the child node is shared (it has reference count > 1), we won't free\nit, so there would be two pointers to each of the grandchildren nodes.\nBut the reference counts of the grandchildren is not increased, thus the\nreference count doesn't match the number of pointers that point to the\ngrandchildren. This results in \"device mapper: space map common: unable\nto decrement block\" errors.\n\nFix this bug by incrementing reference counts on the grandchildren if the\nbtree node is shared."}], "id": "CVE-2026-46107", "lastModified": "2026-06-01T17:17:24.353", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-28T10:16:26.063", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/09a65adc7d8bbfce06392cb6d375468e2728ead5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/12161e03d33afce781f68fa11cc6060538862fad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/323d252a4a378834e4fe68298ca61cfc5dd3a460"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5ec0debbcfd43596e32c1239e993de06a704e04c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85311a585a26640760cd0f3349ab9f2905691044"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f06f6aededd792a754cd677c02b3d3016d868c2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f49b41c9eb7c6ff00df27cd49cea210abbadd8ad"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: dm-thin: fix metadata refcount underflow", "id": "2482637", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482637"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's Device Mapper (dm-thin) component. This vulnerability, a metadata reference count underflow, occurs in the `rebalance_children` function. When an internal btree node with a single entry is shared, the system incorrectly tracks the usage of child nodes. This can lead to 'device mapper: space map common: unable to decrement block' errors, potentially causing a denial of service or data integrity issues."], "name": "CVE-2026-46107", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46107\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46107\nhttps://lore.kernel.org/linux-cve-announce/2026052812-CVE-2026-46107-709a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3241b1d3e0aaafbfcd320f4d71ade629728cc4f4,12161e03d33afce781f68fa11cc6060538862fad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3241b1d3e0aaafbfcd320f4d71ade629728cc4f4,323d252a4a378834e4fe68298ca61cfc5dd3a460)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3241b1d3e0aaafbfcd320f4d71ade629728cc4f4,85311a585a26640760cd0f3349ab9f2905691044)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3241b1d3e0aaafbfcd320f4d71ade629728cc4f4,5ec0debbcfd43596e32c1239e993de06a704e04c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3241b1d3e0aaafbfcd320f4d71ade629728cc4f4,09a65adc7d8bbfce06392cb6d375468e2728ead5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-28T11:30:15.487273+00:00", "updated": "2026-05-30T12:45:23.667960+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}