fix(cve): CVE-2026-53615 - libblkid: dos: validate EBR data and links within extended partition

[deepin-ci-robot]

CVE: CVE-2026-53615 (unknown) - libblkid dos 分区解析器未正确验证 EBR 数据链接是否在扩展分区区域内，允许通过 uint32_t 溢出注册任意扇区的分区
Upstream: util-linux/util-linux@a2d8581

Co-authored-by: hudeng hudeng@deepin.org
Generated-By: qwen3.6-35b

Summary by Sourcery

Bug Fixes:

• Prevent libblkid’s DOS partition parser from accepting EBR data or links that fall outside the extended partition area, addressing CVE-2026-53615.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Backport the upstream CVE-2026-53615 fix to prevent malformed DOS extended-partition EBR links and integer overflow from causing libblkid to register partitions outside the extended partition area.

File-Level Changes

Change	Details	Files
Add a libblkid DOS partition-parser hardening patch that validates extended boot record (EBR) data and link locations before registering partitions.	Check EBR-relative offsets and computed sectors against the containing extended-partition bounds. Guard sector arithmetic against uint32_t overflow and reject malformed links outside the extended region. Register the patch in Debian’s quilt series and document the security fix in the changelog.	debian/patches/CVE-2026-53615.patch debian/patches/series debian/changelog

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

TAG Bot

TAG: 2.40.4-3deepin16
EXISTED: no
DISTRIBUTION: unstable

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[hudeng-go]

/test ai-review