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": "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"
}
],
"id": "CVE-2023-53222",
"lastModified": "2026-08-04T10:18:58.560",
"metrics": {
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
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"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
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{
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"value": "CWE-125"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"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"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
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"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2023-53222",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-14T17:50:30.557530Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
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"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-14T17:50:26.601Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/jfs/jfs_dmap.c",
"fs/jfs/jfs_filsys.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
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"status": "affected",
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{
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"versionType": "git"
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{
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{
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{
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"versions": [
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},
{
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"version": "0",
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{
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},
{
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"version": "4.19.291",
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},
{
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"status": "unaffected",
"version": "5.10.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.121",
"versionType": "semver"
},
{
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"status": "unaffected",
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},
{
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"status": "unaffected",
"version": "6.4.5",
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{
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"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
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"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"
}
],
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},
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"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."
}
]
}
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}
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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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