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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64322

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < eeb0f3e193f8e523d03e4c9e084f6b4875f50e8eaffected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9affected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 2d726135099313958f8975532a2e15322ff150ceaffected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 7285276aa50d2839afb5957ffd491ad282dc8f72affected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 2a219acb2ce674d99bbd1b7b35ed8c384dac7200affected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 04f4599a9efb90992d072a814960edf0cd62805daffected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 7f7774b9da0ef17b87bfa238cf966ad0b3376150affected
  • 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 to < 3ec997bd5508e9b25210b5bbec89031629cdb093affected
  • e240873cb4a9fd18de60a817100a96fe670d4359affected
  • 9ae30e324a96d0328a575329d7a95a09b3318601affected
  • b1c5701ad6b3e5d21d16f65475651cfaaa41e7aaaffected
  • a9f1af04f086656246f30354fb4564ce3b08c4a0affected
  • 4836ee563d65bb492f907cbe267a5761b9693e4daffected
  • 2.6.32.60 to < 2.6.33affected
  • 2.6.34.14 to < 2.6.35affected
  • 3.0.37 to < 3.1affected
  • 3.2.23 to < 3.3affected
  • 3.4.5 to < 3.5affected

Linux Linux

Default version status: affected

  • 3.5affected
  • 0 to < 3.5unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.1.4 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References