CVE-2026-64322udf: validate sparing table length as an entry count, not a byte count
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 2d726135099313958f8975532a2e15322ff150ce
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 7285276aa50d2839afb5957ffd491ad282dc8f72
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 2a219acb2ce674d99bbd1b7b35ed8c384dac7200
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 04f4599a9efb90992d072a814960edf0cd62805d
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 7f7774b9da0ef17b87bfa238cf966ad0b3376150
- affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 – < 3ec997bd5508e9b25210b5bbec89031629cdb093
- affected e240873cb4a9fd18de60a817100a96fe670d4359
- affected 9ae30e324a96d0328a575329d7a95a09b3318601
- affected b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa
- affected a9f1af04f086656246f30354fb4564ce3b08c4a0
- affected 4836ee563d65bb492f907cbe267a5761b9693e4d
- affected 2.6.32.60 – < 2.6.33
- affected 2.6.34.14 – < 2.6.35
- affected 3.0.37 – < 3.1
- affected 3.2.23 – < 3.3
- affected 3.4.5 – < 3.5
- affected 3.5
- unaffected < 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.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e (opens in a new tab)
- https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 (opens in a new tab)
- https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce (opens in a new tab)
- https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72 (opens in a new tab)
- https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200 (opens in a new tab)
- https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d (opens in a new tab)
- https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150 (opens in a new tab)
- https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-49034 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64322)Record last updated .