CVE-2023-53323 (GCVE-0-2023-53323)
Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-05-11 19:42
VLAI
EPSS
VEX
Title
ext2/dax: Fix ext2_setsize when len is page aligned
Summary
In the Linux kernel, the following vulnerability has been resolved:
ext2/dax: Fix ext2_setsize when len is page aligned
PAGE_ALIGN(x) macro gives the next highest value which is multiple of
pagesize. But if x is already page aligned then it simply returns x.
So, if x passed is 0 in dax_zero_range() function, that means the
length gets passed as 0 to ->iomap_begin().
In ext2 it then calls ext2_get_blocks -> max_blocks as 0 and hits bug_on
here in ext2_get_blocks().
BUG_ON(maxblocks == 0);
Instead we should be calling dax_truncate_page() here which takes
care of it. i.e. it only calls dax_zero_range if the offset is not
page/block aligned.
This can be easily triggered with following on fsdax mounted pmem
device.
dd if=/dev/zero of=file count=1 bs=512
truncate -s 0 file
[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)
[93.793207] ------------[ cut here ]------------
[93.795102] kernel BUG at fs/ext2/inode.c:637!
[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139
[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610
<...>
[93.835298] Call Trace:
[93.836253] <TASK>
[93.837103] ? lock_acquire+0xf8/0x110
[93.838479] ? d_lookup+0x69/0xd0
[93.839779] ext2_iomap_begin+0xa7/0x1c0
[93.841154] iomap_iter+0xc7/0x150
[93.842425] dax_zero_range+0x6e/0xa0
[93.843813] ext2_setsize+0x176/0x1b0
[93.845164] ext2_setattr+0x151/0x200
[93.846467] notify_change+0x341/0x4e0
[93.847805] ? lock_acquire+0xf8/0x110
[93.849143] ? do_truncate+0x74/0xe0
[93.850452] ? do_truncate+0x84/0xe0
[93.851739] do_truncate+0x84/0xe0
[93.852974] do_sys_ftruncate+0x2b4/0x2f0
[93.854404] do_syscall_64+0x3f/0x90
[93.855789] entry_SYSCALL_64_after_hwframe+0x72/0xdc
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:28 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2aa3048e03d38d5358be2553d4b638c1a018498c , < 9e54fd14bd143c261e52fde74355e85e9526c58c
(git)
Affected: 2aa3048e03d38d5358be2553d4b638c1a018498c , < 5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab (git) Affected: 2aa3048e03d38d5358be2553d4b638c1a018498c , < fcced95b6ba2a507a83b8b3e0358a8ac16b13e35 (git) |
guessed | |
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 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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But if x is already page aligned then it simply returns x.\\nSo, if x passed is 0 in dax_zero_range() function, that means the\\nlength gets passed as 0 to -\u003eiomap_begin().\\n\\nIn ext2 it then calls ext2_get_blocks -\u003e max_blocks as 0 and hits bug_on\\nhere in ext2_get_blocks().\\n\\tBUG_ON(maxblocks == 0);\\n\\nInstead we should be calling dax_truncate_page() here which takes\\ncare of it. i.e. it only calls dax_zero_range if the offset is not\\npage/block aligned.\\n\\nThis can be easily triggered with following on fsdax mounted pmem\\ndevice.\\n\\ndd if=/dev/zero of=file count=1 bs=512\\ntruncate -s 0 file\\n\\n[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk\\n[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)\\n[93.793207] ------------[ cut here ]------------\\n[93.795102] kernel BUG at fs/ext2/inode.c:637!\\n[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI\\n[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139\\n[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610\\n\u003c...\u003e\\n[93.835298] Call Trace:\\n[93.836253] \u003cTASK\u003e\\n[93.837103] ? lock_acquire+0xf8/0x110\\n[93.838479] ? d_lookup+0x69/0xd0\\n[93.839779] ext2_iomap_begin+0xa7/0x1c0\\n[93.841154] iomap_iter+0xc7/0x150\\n[93.842425] dax_zero_range+0x6e/0xa0\\n[93.843813] ext2_setsize+0x176/0x1b0\\n[93.845164] ext2_setattr+0x151/0x200\\n[93.846467] notify_change+0x341/0x4e0\\n[93.847805] ? lock_acquire+0xf8/0x110\\n[93.849143] ? do_truncate+0x74/0xe0\\n[93.850452] ? do_truncate+0x84/0xe0\\n[93.851739] do_truncate+0x84/0xe0\\n[93.852974] do_sys_ftruncate+0x2b4/0x2f0\\n[93.854404] do_syscall_64+0x3f/0x90\\n[93.855789] 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},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53323\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T18:28:00.441739Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-617\", \"description\": \"CWE-617 Reachable Assertion\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:27:56.378Z\"}}], \"cna\": {\"title\": \"ext2/dax: Fix ext2_setsize when len is page aligned\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2aa3048e03d38d5358be2553d4b638c1a018498c\", \"lessThan\": \"9e54fd14bd143c261e52fde74355e85e9526c58c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2aa3048e03d38d5358be2553d4b638c1a018498c\", \"lessThan\": \"5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2aa3048e03d38d5358be2553d4b638c1a018498c\", \"lessThan\": \"fcced95b6ba2a507a83b8b3e0358a8ac16b13e35\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext2/inode.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"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/ext2/inode.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9e54fd14bd143c261e52fde74355e85e9526c58c\"}, {\"url\": \"https://git.kernel.org/stable/c/5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab\"}, {\"url\": \"https://git.kernel.org/stable/c/fcced95b6ba2a507a83b8b3e0358a8ac16b13e35\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next2/dax: Fix ext2_setsize when len is page aligned\\n\\nPAGE_ALIGN(x) macro gives the next highest value which is multiple of\\npagesize. But if x is already page aligned then it simply returns x.\\nSo, if x passed is 0 in dax_zero_range() function, that means the\\nlength gets passed as 0 to -\u003eiomap_begin().\\n\\nIn ext2 it then calls ext2_get_blocks -\u003e max_blocks as 0 and hits bug_on\\nhere in ext2_get_blocks().\\n\\tBUG_ON(maxblocks == 0);\\n\\nInstead we should be calling dax_truncate_page() here which takes\\ncare of it. i.e. it only calls dax_zero_range if the offset is not\\npage/block aligned.\\n\\nThis can be easily triggered with following on fsdax mounted pmem\\ndevice.\\n\\ndd if=/dev/zero of=file count=1 bs=512\\ntruncate -s 0 file\\n\\n[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk\\n[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)\\n[93.793207] ------------[ cut here ]------------\\n[93.795102] kernel BUG at fs/ext2/inode.c:637!\\n[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI\\n[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139\\n[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610\\n\u003c...\u003e\\n[93.835298] Call Trace:\\n[93.836253] \u003cTASK\u003e\\n[93.837103] ? lock_acquire+0xf8/0x110\\n[93.838479] ? d_lookup+0x69/0xd0\\n[93.839779] ext2_iomap_begin+0xa7/0x1c0\\n[93.841154] iomap_iter+0xc7/0x150\\n[93.842425] dax_zero_range+0x6e/0xa0\\n[93.843813] ext2_setsize+0x176/0x1b0\\n[93.845164] ext2_setattr+0x151/0x200\\n[93.846467] notify_change+0x341/0x4e0\\n[93.847805] ? lock_acquire+0xf8/0x110\\n[93.849143] ? do_truncate+0x74/0xe0\\n[93.850452] ? do_truncate+0x84/0xe0\\n[93.851739] do_truncate+0x84/0xe0\\n[93.852974] do_sys_ftruncate+0x2b4/0x2f0\\n[93.854404] do_syscall_64+0x3f/0x90\\n[93.855789] entry_SYSCALL_64_after_hwframe+0x72/0xdc\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.40\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.5\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-16T16:11:58.877Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-53323\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:32:58.758Z\", \"dateReserved\": \"2025-09-16T16:08:59.563Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-16T16:11:58.877Z\", \"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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