CVE-2026-64323

CVE CVE-2026-64323EUVD EUVD-2026-49035Published 2026-07-25T08:49:51.000ZLast changed 2026-08-05T12:41:00.000ZCVSS 7.1

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux fa5e08156335d0687c85b4e724db9448fb166601 <883962731420ec271ed8c1cd76524f4b17faa982; fa5e08156335d0687c85b4e724db9448fb166601 <0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934; patch: 7.2-rc1; patch: 5.15.212; patch: 6.18.39; patch: 0; patch: 5.10.261; fa5e08156335d0687c85b4e724db9448fb166601 <74580fdf022909e184223cacc364feb826982d96; fa5e08156335d0687c85b4e724db9448fb166601 <55287a3555ff0515b3aff181d2c08c0462a41709; patch: 6.6.145; patch: 6.12.96; fa5e08156335d0687c85b4e724db9448fb166601 <d8202786b3d75125c84ebc4de6d946f92fde0ee8; 2.6.26; patch: 7.1.4; fa5e08156335d0687c85b4e724db9448fb166601 <2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63; fa5e08156335d0687c85b4e724db9448fb166601 <e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad; patch: 6.1.178; fa5e08156335d0687c85b4e724db9448fb166601 <bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.