Answer in brief
CVE-2026-64323 records a High severity (CVSS 7.1) vulnerability in udf: validate VAT header length against the VAT inode size. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fa5e08156335d0687c85b4e724db9448fb166601 <0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934 || >=fa5e08156335d0687c85b4e724db9448fb166601 <883962731420ec271ed8c1cd76524f4b17faa982 || >=fa5e08156335d0687c85b4e724db9448fb166601 <2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63 || >=fa5e08156335d0687c85b4e724db9448fb166601 <bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb || >=fa5e08156335d0687c85b4e724db9448fb166601 <55287a3555ff0515b3aff181d2c08c0462a41709 || >=fa5e08156335d0687c85b4e724db9448fb166601 <e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad || >=fa5e08156335d0687c85b4e724db9448fb166601 <74580fdf022909e184223cacc364feb826982d96 || >=fa5e08156335d0687c85b4e724db9448fb166601 <d8202786b3d75125c84ebc4de6d946f92fde0ee8 | 0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934, 883962731420ec271ed8c1cd76524f4b17faa982, 2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63, bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb, 55287a3555ff0515b3aff181d2c08c0462a41709, e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad, 74580fdf022909e184223cacc364feb826982d96, d8202786b3d75125c84ebc4de6d946f92fde0ee8 |
| Linux/Linuxgeneric | 2.6.26 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: udf: validate VAT header length against the VAT inode size udf_load_vat() takes the virtual partition's start offset straight from the on-disk VAT 2.0 header without checking it against the VAT inode size: map->s_type_specific.s_virtual.s_start_offset = le16_to_cpu(vat20->lengthHeader); map->s_type_specific.s_virtual.s_num_entries = (sbi->s_vat_inode->i_size - map->s_type_specific.s_virtual.s_start_offset) >> 2; lengthHeader is a fully attacker-controlled 16-bit value. If it exceeds the VAT inode size, the s_num_entries subtraction underflows to a huge count, which defeats the "block > s_num_entries" bound in udf_get_pblock_virt15(); and on the ICB-inline path that function reads ((__le32 *)(iinfo->i_data + s_start_offset))[block] so a large s_start_offset indexes past the inode's in-ICB data. Mounting a crafted UDF image with a virtual (VAT) partition then triggers an out-of-bounds read. Reject a VAT whose header length does not leave room for at least one entry within the VAT inode.
Quoted source text, attributed separately from HOL analysis.