udf: validate sparing table length as an entry count, not a byte count
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().
CVE-2026-64322
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64322
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "2d726135099313958f8975532a2e15322ff150ce",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "7285276aa50d2839afb5957ffd491ad282dc8f72",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "2a219acb2ce674d99bbd1b7b35ed8c384dac7200",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "04f4599a9efb90992d072a814960edf0cd62805d",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "7f7774b9da0ef17b87bfa238cf966ad0b3376150",
"versionType": "git"
},
{
"status": "affected",
"version": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050",
"lessThan": "3ec997bd5508e9b25210b5bbec89031629cdb093",
"versionType": "git"
},
{
"status": "affected",
"version": "e240873cb4a9fd18de60a817100a96fe670d4359",
"versionType": "git"
},
{
"status": "affected",
"version": "9ae30e324a96d0328a575329d7a95a09b3318601",
"versionType": "git"
},
{
"status": "affected",
"version": "b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa",
"versionType": "git"
},
{
"status": "affected",
"version": "a9f1af04f086656246f30354fb4564ce3b08c4a0",
"versionType": "git"
},
{
"status": "affected",
"version": "4836ee563d65bb492f907cbe267a5761b9693e4d",
"versionType": "git"
},
{
"status": "affected",
"version": "2.6.32.60",
"lessThan": "2.6.33",
"versionType": "semver"
},
{
"status": "affected",
"version": "2.6.34.14",
"lessThan": "2.6.35",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.0.37",
"lessThan": "3.1",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.2.23",
"lessThan": "3.3",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.4.5",
"lessThan": "3.5",
"versionType": "semver"
}
],
"programFiles": [
"fs/udf/super.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/udf/super.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64322
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41008 · Revision 1
- Added to Heist Feed
- Publisher date