CVE-2026-43359

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A malicious user\ncould exploit this, and this ioctl does not even requires that a user\nhas admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.\n\nFix this by doing an early check for item overflow before starting a\ntransaction. This is also race safe because we are holding the subvol_sem\nsemaphore in exclusive (write) mode.\n\nA test case for fstests will follow soon."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/ioctl.c", "fs/btrfs/uuid-tree.c", "fs/btrfs/uuid-tree.h"], "versions": [{"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "b9914db13ac15aca3b74544c0bb1a2e0dad1f174", "status": "affected", "versionType": "git"}, {"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "b19c0465e4daad5aa8f60552ea0578cf31a11b1e", "status": "affected", "versionType": "git"}, {"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5", "status": "affected", "versionType": "git"}, {"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "d11aefe654a04fc41996d254748d6a38b6b0a7be", "status": "affected", "versionType": "git"}, {"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "41fb97353ff58fa4f31904c343fc8e3df2f7517d", "status": "affected", "versionType": "git"}, {"version": "dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70", "lessThan": "87f2c46003fce4d739138aab4af1942b1afdadac", "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/ioctl.c", "fs/btrfs/uuid-tree.c", "fs/btrfs/uuid-tree.h"], "versions": [{"version": "3.12", "status": "affected"}, {"version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "3.12", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174"}, {"url": "https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e"}, {"url": "https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5"}, {"url": "https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be"}, {"url": "https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d"}, {"url": "https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac"}], "title": "btrfs: fix transaction abort on set received ioctl due to item overflow", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43359", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T15:36:21.571725Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T15:42:50.278Z"}}]}}

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A malicious user\ncould exploit this, and this ioctl does not even requires that a user\nhas admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.\n\nFix this by doing an early check for item overflow before starting a\ntransaction. 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A malicious user\ncould exploit this, and this ioctl does not even requires that a user\nhas admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.\n\nFix this by doing an early check for item overflow before starting a\ntransaction. This is also race safe because we are holding the subvol_sem\nsemaphore in exclusive (write) mode.\n\nA test case for fstests will follow soon."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: corrige el aborto de transacci\u00f3n en el ioctl \u2019set received\u2019 debido a un desbordamiento de elemento\n\nSi el ioctl \u2019set received\u2019 falla debido a un desbordamiento de elemento al intentar a\u00f1adir el BTRFS_UUID_KEY_RECEIVED_SUBVOL, tenemos que abortar la transacci\u00f3n ya que hicimos algunas actualizaciones de metadatos antes.\n\nEsto significa que si un usuario llama a este ioctl con el mismo campo UUID recibido para muchos subvol\u00famenes, alcanzaremos el desbordamiento, desencadenaremos el aborto de la transacci\u00f3n y pondremos el sistema de archivos en modo RO. Un usuario malicioso podr\u00eda explotar esto, y este ioctl ni siquiera requiere que un usuario tenga privilegios de administrador (CAP_SYS_ADMIN), solo que sea propietario del subvolumen.\n\nSoluciona esto haciendo una verificaci\u00f3n temprana de desbordamiento de elemento antes de iniciar una transacci\u00f3n. Esto tambi\u00e9n es seguro frente a condiciones de carrera porque estamos manteniendo el sem\u00e1foro subvol_sem en modo exclusivo (escritura).\n\nUn caso de prueba para fstests seguir\u00e1 pronto."}], "id": "CVE-2026-43359", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43359", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:36:21.571725Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:46.717", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-191"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix transaction abort on set received ioctl due to item overflow", "id": "2468167", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468167"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in the Linux kernel's Btrfs file system. A local malicious user, who owns a subvolume, can exploit an item overflow vulnerability when repeatedly calling the `set received ioctl` with the same received UUID field for multiple subvolumes. This can trigger a transaction abort, leading to the file system being mounted in read-only mode, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-43359", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43359\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43359\nhttps://lore.kernel.org/linux-cve-announce/2026050825-CVE-2026-43359-ec41@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70,b9914db13ac15aca3b74544c0bb1a2e0dad1f174)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70,b19c0465e4daad5aa8f60552ea0578cf31a11b1e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70,2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70,d11aefe654a04fc41996d254748d6a38b6b0a7be)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d375...b92768fb1ce70,41fb97353ff58fa4f31904c343fc8e3df2f7517d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70,87f2c46003fce4d739138aab4af1942b1afdadac)"}}], "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": "semver", "value": "3.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-08T16:45:12.739303+00:00", "updated": "2026-05-15T17:00:04.809929+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}