CVE-2026-64322
udf: validate sparing table length as an entry count, not a byte count
At a glance
- Source
- NVD
- EPSS
- EPSS 0.17 % · percentile 6 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
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().
Weaknesses (CWE)
- CWE-787 — Out-of-bounds Write
References
- https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e
- https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9
- https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce
- https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72
- https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200
- https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d
- https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150
- https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-49034
- GCVE · GCVE-0-2026-64322
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1255 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1252 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1231 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1202 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1164 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1162 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1031 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0982 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.32.60 < 2.6.33cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.34.14 < 2.6.35cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 3.0.37 < 3.1cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 3.2.23 < 3.3cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 3.4.5 < 3.5cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 3.5.1 < 5.10.261cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.212cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.178cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.145cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.96cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.39cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.1.4cpe:2.3:o:linux:linux_kernel:3.5:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:3.5:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:3.5:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:3.5:rc7:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e ; affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 ; affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < 2d726135099313958f8975532a2e15322ff150ce ; affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < 7285276aa50d2839afb5957ffd491ad282dc8f72 ; affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < 2a219acb2ce674d99bbd1b7b35ed8c384dac7200 ; affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 < 04f4599a9efb90992d072a814960edf0cd62805d |
| Linux · Linux | affected 3.5 ; unaffected 0 < 3.5 ; unaffected 5.10.261 ≤ 5.10.* ; unaffected 5.15.212 ≤ 5.15.* ; unaffected 6.1.178 ≤ 6.1.* ; unaffected 6.6.145 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |