CVE-2023-52804

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'atomic_t[128]'\n\nAdd checking that the values of db_maxag and db_agpref are valid\nindexes for the db_agfree array."}], "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"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached by mounting a crafted JFS block-device image (e.g. loop/USB) and then performing local filesystem operations; it is not reachable via remote packet parsing.\nAC:L - The attacker fully controls the on-disk bmap fields and can set db_agpref/db_maxag to out-of-range values that reliably trigger the OOB paths on subsequent allocations (e.g. symlink \u2192 dbAlloc \u2192 dbNextAG).\nPR:L - An unprivileged local user can supply a malicious JFS image and have it mounted via common low-privilege mount helpers (e.g. udisks), then trigger the bug with ordinary file-creating syscalls on that mount.\nUI:N - No separate victim action is required once the attacker can mount their own crafted image and exercise write paths such as symlink/create on it.\nS:U - Impact is confined to the local kernel/host authority (memory corruption / privilege escalation within the same system); it does not cross a VM, IOMMU, or other security boundary.\nC:H - Attacker-controlled indexes cause large out-of-bounds reads of kernel heap (db_active/db_agfree and related structures), which can disclose arbitrary adjacent memory.\nI:H - Out-of-range db_maxag drives OOB AG_LOCK/diAllocAG and related allocator updates past MAXAG-sized arrays, enabling heap corruption and control-flow/integrity compromise.\nA:H - The same OOB accesses reliably produce kernel UBSAN/KASAN failures and can oops/panic or otherwise crash the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/jfs/jfs_dmap.c"], "versions": [{"version": 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crafted JFS block-device image (e.g. loop/USB) and then performing local filesystem operations; it is not reachable via remote packet parsing.\nAC:L - The attacker fully controls the on-disk bmap fields and can set db_agpref/db_maxag to out-of-range values that reliably trigger the OOB paths on subsequent allocations (e.g. symlink \u2192 dbAlloc \u2192 dbNextAG).\nPR:L - An unprivileged local user can supply a malicious JFS image and have it mounted via common low-privilege mount helpers (e.g. udisks), then trigger the bug with ordinary file-creating syscalls on that mount.\nUI:N - No separate victim action is required once the attacker can mount their own crafted image and exercise write paths such as symlink/create on it.\nS:U - Impact is confined to the local kernel/host authority (memory corruption / privilege escalation within the same system); it does not cross a VM, IOMMU, or other security boundary.\nC:H - Attacker-controlled indexes cause large out-of-bounds reads of kernel 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{"lessThanOrEqual": "4.14.*", "status": "unaffected", "version": "4.14.331", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.300", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.262", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.202", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.140", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.64", "versionType": "semver"}, {"lessThanOrEqual": "6.5.*", "status": "unaffected", "version": "6.5.13", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.7", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6F120ED7-3012-4856-9F08-B433BC310335", "versionEndExcluding": "4.14.331", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C99DDB75-1CAC-40D0-A14D-67A2A55D6005", "versionEndExcluding": "4.19.300", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "28B0AAED-45BA-4928-9A85-66A429B9F038", "versionEndExcluding": "5.4.262", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "39D508B4-58C7-40C2-BE05-44E41110EB98", "versionEndExcluding": "5.10.202", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15D6C23C-78A3-40D2-B76B-4F1D9C2D95C0", "versionEndExcluding": "5.15.140", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8D7C884A-CAA2-4EA2-9FEB-5CE776D7B05F", "versionEndExcluding": "6.1.64", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "674C4F82-C336-4B49-BF64-1DE422E889C4", "versionEndExcluding": "6.5.13", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B58252FA-A49C-411F-9B28-DC5FE44BC5A0", "versionEndExcluding": "6.6.3", "versionStartIncluding": "6.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/jfs: Add validity check for db_maxag and db_agpref\n\nBoth db_maxag and db_agpref are used as the index of the\ndb_agfree array, but there is currently no validity check for\ndb_maxag and db_agpref, which can lead to errors.\n\nThe following is related bug reported by Syzbot:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20\nindex 7936 is out of range for type 'atomic_t[128]'\n\nAdd checking that the values of db_maxag and db_agpref are valid\nindexes for the db_agfree array."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: fs/jfs: agregue verificaci\u00f3n de validez para db_maxag y db_agpref. Tanto db_maxag como db_agpref se utilizan como \u00edndice de la matriz db_agfree, pero actualmente no hay verificaci\u00f3n de validez para db_maxag y db_agpref, lo cual puede dar lugar a errores. El siguiente es un error relacionado reportado por Syzbot: UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20 el \u00edndice 7936 est\u00e1 fuera de rango para el tipo 'atomic_t[128]' Agregue verificando que el Los valores de db_maxag y db_agpref son \u00edndices v\u00e1lidos para la matriz db_agfree."}], "id": "CVE-2023-52804", "lastModified": "2026-08-04T10:18:42.377", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52804", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:36:50.346379Z", "version": "2.0.3"}}]}, "published": "2024-05-21T16:15:18.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f74d336990f37703a8eee77153463d65b67f70e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2323de34a3ae61a9f9b544c18583f71cea86721f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32bd8f1cbcf8b663e29dd1f908ba3a129541a11b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5013f8269887642cca784adc8db9b5f0b771533f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64933ab7b04881c6c18b21ff206c12278341c72e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0649e2dd4a3595b5595a29d0064d047c2fae2fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6c8863fb3f57700ab583d875adda04caaf2278a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce15b0f1a431168f07b1cc6c9f71206a2db5c809"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dca403bb035a565bb98ecc1dda5d30f676feda40"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f74d336990f37703a8eee77153463d65b67f70e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2323de34a3ae61a9f9b544c18583f71cea86721f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32bd8f1cbcf8b663e29dd1f908ba3a129541a11b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5013f8269887642cca784adc8db9b5f0b771533f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64933ab7b04881c6c18b21ff206c12278341c72e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0649e2dd4a3595b5595a29d0064d047c2fae2fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6c8863fb3f57700ab583d875adda04caaf2278a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce15b0f1a431168f07b1cc6c9f71206a2db5c809"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dca403bb035a565bb98ecc1dda5d30f676feda40"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/jfs: Add validity check for db_maxag and db_agpref", "id": "2282731", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282731"}, "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-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfs/jfs: Add validity check for db_maxag and db_agpref\nBoth db_maxag and db_agpref are used as the index of the\ndb_agfree array, but there is currently no validity check for\ndb_maxag and db_agpref, which can lead to errors.\nThe following is related bug reported by Syzbot:\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20\nindex 7936 is out of range for type 'atomic_t[128]'\nAdd checking that the values of db_maxag and db_agpref are valid\nindexes for the db_agfree array."], "name": "CVE-2023-52804", "package_state": [{"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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52804\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52804\nhttps://lore.kernel.org/linux-cve-announce/2024052100-CVE-2023-52804-b817@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:15:55.403937+00:00", "updated": "2025-07-12T22:15:55.403997+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}