CVE-2025-39884

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If btrfs_iget() is called\nfor the same inode in that window, it will be recreated and inserted\ninto the xarray, but then eviction will delete the new entry, leaving\nnothing in the xarray:\n\nThread 1 Thread 2\n---------------------------------------------------------------\nevict()\n remove_inode_hash()\n btrfs_iget_path()\n btrfs_iget_locked()\n btrfs_read_locked_inode()\n btrfs_add_inode_to_root()\n destroy_inode()\n btrfs_destroy_inode()\n btrfs_del_inode_from_root()\n __xa_erase\n\nIn turn, this can cause issues for subvolume deletion. Specifically, if\nan inode is in this lost state, and all other inodes are evicted, then\nbtrfs_del_inode_from_root() will call btrfs_add_dead_root() prematurely.\nIf the lost inode has a delayed_node attached to it, then when\nbtrfs_clean_one_deleted_snapshot() calls btrfs_kill_all_delayed_nodes(),\nit will loop forever because the delayed_nodes xarray will never become\nempty (unless memory pressure forces the inode out). We saw this\nmanifest as soft lockups in production.\n\nFix it by only deleting the xarray entry if it matches the given inode\n(using __xa_cmpxchg())."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/inode.c"], "versions": [{"version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "lessThan": "9ba898c9fcbe6ebb88bcd4df8aab0f90090d202e", "status": "affected", "versionType": "git"}, {"version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "lessThan": "f1498abaf74f8d7b1e7001f16ed77818d8ae6a59", "status": "affected", "versionType": "git"}, {"version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "lessThan": "f6a6c280059c4ddc23e12e3de1b01098e240036f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/inode.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.48", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.8", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.11", "versionEndExcluding": "6.12.48"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.16.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9ba898c9fcbe6ebb88bcd4df8aab0f90090d202e"}, {"url": "https://git.kernel.org/stable/c/f1498abaf74f8d7b1e7001f16ed77818d8ae6a59"}, {"url": "https://git.kernel.org/stable/c/f6a6c280059c4ddc23e12e3de1b01098e240036f"}], "title": "btrfs: fix subvolume deletion lockup caused by inodes xarray race", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-39884", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T19:26:01.035116Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-667", "description": "CWE-667 Improper Locking"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:33:12.790Z"}}]}}

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Specifically, there is a window during evict() between the inode\nbeing unhashed and deleted from the xarray. If btrfs_iget() is called\nfor the same inode in that window, it will be recreated and inserted\ninto the xarray, but then eviction will delete the new entry, leaving\nnothing in the xarray:\n\nThread 1 Thread 2\n---------------------------------------------------------------\nevict()\n remove_inode_hash()\n btrfs_iget_path()\n btrfs_iget_locked()\n btrfs_read_locked_inode()\n btrfs_add_inode_to_root()\n destroy_inode()\n btrfs_destroy_inode()\n btrfs_del_inode_from_root()\n __xa_erase\n\nIn turn, this can cause issues for subvolume deletion. Specifically, if\nan inode is in this lost state, and all other inodes are evicted, then\nbtrfs_del_inode_from_root() will call btrfs_add_dead_root() prematurely.\nIf the lost inode has a delayed_node attached to it, then when\nbtrfs_clean_one_deleted_snapshot() calls btrfs_kill_all_delayed_nodes(),\nit will loop forever because the delayed_nodes xarray will never become\nempty (unless memory pressure forces the inode out). We saw this\nmanifest as soft lockups in production.\n\nFix it by only deleting the xarray entry if it matches the given inode\n(using __xa_cmpxchg())."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.48", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.8", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "6.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-29T06:01:44.690Z"}}}, "cveMetadata": {"cveId": "CVE-2025-39884", "state": "PUBLISHED", "dateUpdated": "2026-01-14T19:33:12.790Z", "dateReserved": "2025-04-16T07:20:57.145Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-23T06:00:52.064Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9ba898c9fcbe6ebb88bcd4df8aab0f90090d202e", "status": "affected", "version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "versionType": "git"}, {"lessThan": "f1498abaf74f8d7b1e7001f16ed77818d8ae6a59", "status": "affected", "version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "versionType": "git"}, {"lessThan": "f6a6c280059c4ddc23e12e3de1b01098e240036f", "status": "affected", "version": "310b2f5d5a9451b708ab1d3385c3b0998084904c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.48", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D35EB26A-CFDE-4E9A-9177-B36C1AF15545", "versionEndExcluding": "6.12.48", "versionStartIncluding": "6.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8DA00A4E-AABB-4A69-AB39-67B22D0B36D2", "versionEndExcluding": "6.16.8", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix subvolume deletion lockup caused by inodes xarray race\n\nThere is a race condition between inode eviction and inode caching that\ncan cause a live struct btrfs_inode to be missing from the root->inodes\nxarray. Specifically, there is a window during evict() between the inode\nbeing unhashed and deleted from the xarray. If btrfs_iget() is called\nfor the same inode in that window, it will be recreated and inserted\ninto the xarray, but then eviction will delete the new entry, leaving\nnothing in the xarray:\n\nThread 1 Thread 2\n---------------------------------------------------------------\nevict()\n remove_inode_hash()\n btrfs_iget_path()\n btrfs_iget_locked()\n btrfs_read_locked_inode()\n btrfs_add_inode_to_root()\n destroy_inode()\n btrfs_destroy_inode()\n btrfs_del_inode_from_root()\n __xa_erase\n\nIn turn, this can cause issues for subvolume deletion. Specifically, if\nan inode is in this lost state, and all other inodes are evicted, then\nbtrfs_del_inode_from_root() will call btrfs_add_dead_root() prematurely.\nIf the lost inode has a delayed_node attached to it, then when\nbtrfs_clean_one_deleted_snapshot() calls btrfs_kill_all_delayed_nodes(),\nit will loop forever because the delayed_nodes xarray will never become\nempty (unless memory pressure forces the inode out). We saw this\nmanifest as soft lockups in production.\n\nFix it by only deleting the xarray entry if it matches the given inode\n(using __xa_cmpxchg())."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: soluciona el bloqueo en la eliminaci\u00f3n de subvol\u00famenes causado por una condici\u00f3n de carrera en el xarray de inodos\n\nExiste una condici\u00f3n de carrera entre la expulsi\u00f3n de inodos y el almacenamiento en cach\u00e9 de inodos que puede causar que una estructura struct btrfs_inode activa falte del xarray root->inodes. Espec\u00edficamente, existe una ventana durante evict() entre el momento en que el inodo es deshasheado y eliminado del xarray. Si se llama a btrfs_iget() para el mismo inodo en esa ventana, ser\u00e1 recreado e insertado en el xarray, pero luego la expulsi\u00f3n eliminar\u00e1 la nueva entrada, sin dejar nada en el xarray:\n\nHilo 1 Hilo 2\n---------------------------------------------------------------\nevict()\n remove_inode_hash()\n btrfs_iget_path()\n btrfs_iget_locked()\n btrfs_read_locked_inode()\n btrfs_add_inode_to_root()\n destroy_inode()\n btrfs_destroy_inode()\n btrfs_del_inode_from_root()\n __xa_erase\n\nA su vez, esto puede causar problemas para la eliminaci\u00f3n de subvol\u00famenes. Espec\u00edficamente, si un inodo se encuentra en este estado perdido, y todos los dem\u00e1s inodos son expulsados, entonces btrfs_del_inode_from_root() llamar\u00e1 a btrfs_add_dead_root() prematuramente. Si el inodo perdido tiene un delayed_node adjunto, entonces, cuando btrfs_clean_one_deleted_snapshot() llama a btrfs_kill_all_delayed_nodes(), entrar\u00e1 en un bucle infinito porque el xarray de delayed_nodes nunca quedar\u00e1 vac\u00edo (a menos que la presi\u00f3n de memoria fuerce la expulsi\u00f3n del inodo). Vimos que esto se manifestaba como bloqueos suaves en producci\u00f3n.\n\nSe soluciona eliminando la entrada del xarray solo si coincide con el inodo dado (usando __xa_cmpxchg())."}], "id": "CVE-2025-39884", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39884", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T19:26:01.035116Z", "version": "2.0.3"}}]}, "published": "2025-09-23T06:15:48.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ba898c9fcbe6ebb88bcd4df8aab0f90090d202e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1498abaf74f8d7b1e7001f16ed77818d8ae6a59"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6a6c280059c4ddc23e12e3de1b01098e240036f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-667"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix subvolume deletion lockup caused by inodes xarray race", "id": "2397561", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2397561"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39884", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39884\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39884\nhttps://lore.kernel.org/linux-cve-announce/2025092302-CVE-2025-39884-1503@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-23T16:03:12.106140+00:00", "updated": "2025-09-23T16:03:12.106195+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}