udf: validate sparing table length as an entry count, not a byte count

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64322
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:13 UTC
Updated2026-07-27 05:16:42 UTC
DescriptionIn 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().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001640000 probability, percentile 0.060280000 (date 2026-07-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 2d726135099313958f8975532a2e15322ff150ce git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 7285276aa50d2839afb5957ffd491ad282dc8f72 git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 2a219acb2ce674d99bbd1b7b35ed8c384dac7200 git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 04f4599a9efb90992d072a814960edf0cd62805d git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 7f7774b9da0ef17b87bfa238cf966ad0b3376150 git Not specified
CNA Linux Linux affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 3ec997bd5508e9b25210b5bbec89031629cdb093 git Not specified
CNA Linux Linux affected e240873cb4a9fd18de60a817100a96fe670d4359 git Not specified
CNA Linux Linux affected 9ae30e324a96d0328a575329d7a95a09b3318601 git Not specified
CNA Linux Linux affected b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa git Not specified
CNA Linux Linux affected a9f1af04f086656246f30354fb4564ce3b08c4a0 git Not specified
CNA Linux Linux affected 4836ee563d65bb492f907cbe267a5761b9693e4d git Not specified
CNA Linux Linux affected 2.6.32.60 2.6.33 semver Not specified
CNA Linux Linux affected 2.6.34.14 2.6.35 semver Not specified
CNA Linux Linux affected 3.0.37 3.1 semver Not specified
CNA Linux Linux affected 3.2.23 3.3 semver Not specified
CNA Linux Linux affected 3.4.5 3.5 semver Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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