CVE-2023-53222 (GCVE-0-2023-53222)
Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-08-05 09:13
VLAI
EPSS
VEX
Title
jfs: jfs_dmap: Validate db_l2nbperpage while mounting
Summary
In the Linux kernel, the following vulnerability has been resolved:
jfs: jfs_dmap: Validate db_l2nbperpage while mounting
In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block
number inside dbFree(). db_l2nbperpage, which is the log2 number of
blocks per page, is passed as an argument to BLKTODMAP which uses it
for shifting.
Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is
too big. This happens because the large value is set without any
validation in dbMount() at line 181.
Thus, make sure that db_l2nbperpage is correct while mounting.
Max number of blocks per page = Page size / Min block size
=> log2(Max num_block per page) = log2(Page size / Min block size)
= log2(Page size) - log2(Min block size)
=> Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE
Severity
7.8 (High)
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:50 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8c1efe3f74a7864461b0dff281c5562154b4aa8e
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4855aeb13e4ad1f23e16753b68212e180f7d848 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 47b7eaae08e8b2f25bdf37bc14d21be090bcb20f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < de984faecddb900fa850af4df574a25b32bb93f5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c7feb54b113802d2aba98708769d3c33fb017254 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2a03c4e683d33d17b667418eb717b13dda1fac6b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 11509910c599cbd04585ec35a6d5e1a0053d84c1 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 4.14.322 , ≤ 4.14.* (semver) Unaffected: 4.19.291 , ≤ 4.19.* (semver) Unaffected: 5.4.251 , ≤ 5.4.* (semver) Unaffected: 5.10.188 , ≤ 5.10.* (semver) Unaffected: 5.15.121 , ≤ 5.15.* (semver) Unaffected: 6.1.40 , ≤ 6.1.* (semver) Unaffected: 6.4.5 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:L - The bug is reached only after a local mount of an attacker-crafted JFS image on a block/loop device (mount \u2192 jfs_fill_super \u2192 jfs_mount \u2192 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\u2019s 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."
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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=\u003e 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=\u003e Max db_l2nbperpage = L2PSIZE - 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:21:54+00:00",
"cve": "CVE-2023-53222",
"id": "CVE-2023-53222",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: jfs: jfs_dmap: Validate db_l2nbperpage while mounting",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53222.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-01T01:16:29Z",
"cve": "CVE-2023-53222",
"id": "CVE-2023-53222",
"initial_release_date": "2025-09-21T23:24:51Z",
"product_status:known_affected": "344",
"product_status:known_not_affected": "265",
"product_status:recommended": "516",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-53222",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53222.json",
"version": "49"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:50:26.601Z\"}}], \"cna\": {\"title\": \"jfs: jfs_dmap: Validate db_l2nbperpage while mounting\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"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 \\u2192 jfs_fill_super \\u2192 jfs_mount \\u2192 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\\u2019s 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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"8c1efe3f74a7864461b0dff281c5562154b4aa8e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"a4855aeb13e4ad1f23e16753b68212e180f7d848\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"47b7eaae08e8b2f25bdf37bc14d21be090bcb20f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"de984faecddb900fa850af4df574a25b32bb93f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"c7feb54b113802d2aba98708769d3c33fb017254\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"2a03c4e683d33d17b667418eb717b13dda1fac6b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"11509910c599cbd04585ec35a6d5e1a0053d84c1\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/jfs/jfs_dmap.c\", \"fs/jfs/jfs_filsys.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.322\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.291\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.251\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.121\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/jfs/jfs_dmap.c\", \"fs/jfs/jfs_filsys.h\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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=\u003e 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=\u003e Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.322\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.291\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.251\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.188\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.121\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.40\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.5\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:13:10.735Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-53222\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T09:13:10.735Z\", \"dateReserved\": \"2025-09-15T14:19:21.845Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:21:50.970Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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