CVE-2026-64322 (GCVE-0-2026-64322)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-10-19 20:38
VLAI
EPSS
VEX
Title
udf: validate sparing table length as an entry count, not a byte count
Summary
In the Linux kernel, the following vulnerability has been resolved:
udf: validate sparing table length as an entry count, not a byte count
udf_load_sparable_map() accepts a sparing table when
sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > sb->s_blocksize
is false, i.e. it treats reallocationTableLen as a number of BYTES that
must fit in the block. But the table is walked as an array of 8-byte
sparingEntry elements:
for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
struct sparingEntry *entry = &st->mapEntry[i];
... entry->origLocation ...
}
in udf_get_pblock_spar15() and udf_relocate_blocks(). A
reallocationTableLen of N therefore passes the check whenever
sizeof(*st) + N <= blocksize, yet the consumers index
sizeof(*st) + N * sizeof(struct sparingEntry) bytes -- up to ~8x the
block. On a crafted UDF image this is an out-of-bounds read in
udf_get_pblock_spar15(); udf_relocate_blocks() additionally feeds the
same length to udf_update_tag(), whose crc_itu_t() reads far past the
block, and its memmove() through st->mapEntry[] is an out-of-bounds
write.
Validate reallocationTableLen as the entry count it is, with
struct_size().
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:39 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e
(git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 2d726135099313958f8975532a2e15322ff150ce (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 7285276aa50d2839afb5957ffd491ad282dc8f72 (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 2a219acb2ce674d99bbd1b7b35ed8c384dac7200 (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 04f4599a9efb90992d072a814960edf0cd62805d (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 7f7774b9da0ef17b87bfa238cf966ad0b3376150 (git) Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 3ec997bd5508e9b25210b5bbec89031629cdb093 (git) Affected: e240873cb4a9fd18de60a817100a96fe670d4359 (git) Affected: 9ae30e324a96d0328a575329d7a95a09b3318601 (git) Affected: b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa (git) Affected: a9f1af04f086656246f30354fb4564ce3b08c4a0 (git) Affected: 4836ee563d65bb492f907cbe267a5761b9693e4d (git) Affected: 2.6.32.60 , < 2.6.33 (semver) Affected: 2.6.34.14 , < 2.6.35 (semver) Affected: 3.0.37 , < 3.1 (semver) Affected: 3.2.23 , < 3.3 (semver) Affected: 3.4.5 , < 3.5 (semver) |
guessed | |
| Linux | Linux |
Affected:
3.5
Unaffected: 0 , < 3.5 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate sparing table length as an entry count, not a byte count\n\nudf_load_sparable_map() accepts a sparing table when\n\n\tsizeof(*st) + le16_to_cpu(st-\u003ereallocationTableLen) \u003e sb-\u003es_blocksize\n\nis false, i.e. it treats reallocationTableLen as a number of BYTES that\nmust fit in the block. But the table is walked as an array of 8-byte\nsparingEntry elements:\n\n\tfor (i = 0; i \u003c le16_to_cpu(st-\u003ereallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = \u0026st-\u003emapEntry[i];\n\t\t... entry-\u003eorigLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks(). A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N \u003c= blocksize, yet the consumers index\nsizeof(*st) + N * sizeof(struct sparingEntry) bytes -- up to ~8x the\nblock. On a crafted UDF image this is an out-of-bounds read in\nudf_get_pblock_spar15(); udf_relocate_blocks() additionally feeds the\nsame length to udf_update_tag(), whose crc_itu_t() reads far past the\nblock, and its memmove() through st-\u003emapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size()."
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"value": "AV:L - A crafted UDF image must be presented and mounted as local loop or removable block media; no network-facing path reaches this parser.\nAC:L - The attacker deterministically controls the entry count, table contents, block size, and accessed packet, with no race or condition outside attacker control.\nPR:L - Direct mounting requires initial-namespace CAP_SYS_ADMIN and user namespaces do not help, but common UDisks/polkit configurations let an active unprivileged local user mount attacker-controlled loop or removable media through a privileged broker.\nUI:N - The local attacker can request the brokered mount and trigger block translation themselves, requiring no action by a separate victim.\nS:U - Exploitation compromises the host kernel within its existing security authority and does not inherently cross a VM, IOMMU, or other scope boundary.\nC:H - The malformed count permits reads up to roughly eight times beyond the block, and relocation can expose adjacent kernel data through copied entries or returned mapping values.\nI:H - udf_relocate_blocks performs an out-of-bounds origLocation store and attacker-sized memmove through mapEntry[], potentially corrupting adjacent kernel pages and enabling control-flow hijacking.\nA:H - The extensive out-of-bounds reads and writes can reliably cause a kernel oops, panic, or fatal memory corruption."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:53:23.900Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e"
},
{
"url": "https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9"
},
{
"url": "https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce"
},
{
"url": "https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72"
},
{
"url": "https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200"
},
{
"url": "https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d"
},
{
"url": "https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150"
},
{
"url": "https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093"
}
],
"title": "udf: validate sparing table length as an entry count, not a byte count",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64322",
"datePublished": "2026-07-25T08:49:50.180Z",
"dateReserved": "2026-07-19T15:36:31.780Z",
"dateUpdated": "2026-10-19T20:38:23.865Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.