{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53222", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T14:19:21.845Z", "datePublished": "2025-09-15T14:21:50.970Z", "dateUpdated": "2026-08-05T09:13:10.735Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:10.735Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: jfs_dmap: Validate db_l2nbperpage while mounting\n\nIn jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block\nnumber inside dbFree(). db_l2nbperpage, which is the log2 number of\nblocks per page, is passed as an argument to BLKTODMAP which uses it\nfor shifting.\n\nSyzbot reported a shift out-of-bounds crash because db_l2nbperpage is\ntoo big. This happens because the large value is set without any\nvalidation in dbMount() at line 181.\n\nThus, make sure that db_l2nbperpage is correct while mounting.\n\nMax number of blocks per page = Page size / Min block size\n=> log2(Max num_block per page) = log2(Page size / Min block size)\n\t\t\t\t= log2(Page size) - log2(Min block size)\n\n=> Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE" } ], "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 only after a local mount of an attacker-crafted JFS image on a block/loop device (mount → jfs_fill_super → jfs_mount → dbMount, then later dbFree); there is no network or adjacent-protocol path into fs/jfs.\nAC:L - dn_l2nbperpage is taken verbatim from the on-disk bmap descriptor, so the attacker sets the out-of-range shift amount deterministically; any subsequent free/truncate/umount path that calls BLKTODMAP/dbFree hits the bug with no race or uncontrollable state.\nPR:L - As with sibling JFS crafted-image CVEs, an unprivileged local session user can get the malicious image attached via udisks2/polkit/automount on desktops, kiosks, and shared workstations, then trigger dbFree with ordinary file operations or unmount on that volume.\nUI:N - The attacker supplies the image, causes it to be mounted (including via automount/udisks on their own session), and drives the free/umount path themselves; no separate victim action is required at exploitation time.\nS:U - Wrong metapage selection and allocator/metadata corruption stay inside the kernel’s own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - An oversized db_l2nbperpage makes BLKTODMAP compute attacker-influenced logical block numbers so dbFree reads the wrong (still attacker-controlled) dmap metapage and walks its summary tree/bitmaps, yielding out-of-bounds reads of adjacent kernel/metapage memory that can be leveraged for disclosure, consistent with other JFS dmap shift-OOB scores.\nI:H - dbFreeDmap/dbFreeBits then write wmap/tree/nfree and in-memory db_agfree[] based on that wrong page and undefined shift results, corrupting heap-backed metapage and bmap state into a write primitive suitable for control-flow hijacking under the higher-severity rule for memory corruption.\nA:H - Syzbot reproduced this as UBSAN shift-out-of-bounds in dbFree (panic under UBSAN_TRAP/panic_on_warn), and the corrupted metapage/allocator paths also produce oopses and jfs_error filesystem shutdown." } ] } ], "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", "fs/jfs/jfs_filsys.h" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8c1efe3f74a7864461b0dff281c5562154b4aa8e", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a4855aeb13e4ad1f23e16753b68212e180f7d848", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "47b7eaae08e8b2f25bdf37bc14d21be090bcb20f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "de984faecddb900fa850af4df574a25b32bb93f5", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c7feb54b113802d2aba98708769d3c33fb017254", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2a03c4e683d33d17b667418eb717b13dda1fac6b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "11509910c599cbd04585ec35a6d5e1a0053d84c1", "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/jfs/jfs_dmap.c", "fs/jfs/jfs_filsys.h" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.322", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.291", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.251", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.188", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.121", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.40", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.5", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "2.6.12", "versionEndExcluding": "4.14.322" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.291" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.251" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.4.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8e" }, { "url": "https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2" }, { "url": "https://git.kernel.org/stable/c/a4855aeb13e4ad1f23e16753b68212e180f7d848" }, { "url": "https://git.kernel.org/stable/c/47b7eaae08e8b2f25bdf37bc14d21be090bcb20f" }, { "url": "https://git.kernel.org/stable/c/de984faecddb900fa850af4df574a25b32bb93f5" }, { "url": "https://git.kernel.org/stable/c/c7feb54b113802d2aba98708769d3c33fb017254" }, { "url": "https://git.kernel.org/stable/c/2a03c4e683d33d17b667418eb717b13dda1fac6b" }, { "url": "https://git.kernel.org/stable/c/11509910c599cbd04585ec35a6d5e1a0053d84c1" } ], "title": "jfs: jfs_dmap: Validate db_l2nbperpage while mounting", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53222", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T17:50:30.557530Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T17:52:59.269Z" } } ] } }