fix(cve): CVE-2026-27456 - loopdev: add LOOPDEV_FL_NOFOLLOW to prevent symlink attacks

[deepin-ci-robot]

CVE: CVE-2026-27456 (medium) - 循环设备上下文中的符号链接攻击漏洞，攻击者可通过替换备份文件为符号链接来读取任意根属主的文件
Upstream: util-linux/util-linux@7916466

Co-authored-by: hudeng [email protected]
Generated-By: qwen3.6-35b

Summary by Sourcery

Apply upstream fix for CVE-2026-27456 by adding a security patch to loop device handling to prevent symlink-based attacks.

Bug Fixes:

• Mitigate CVE-2026-27456 by ensuring loop device operations do not follow symlinks, preventing unauthorized root-owned file reads.

Build:

• Update Debian packaging to include the new CVE-2026-27456 patch in the changelog and patch series.
  CVE: CVE-2026-3184 (medium) - A flaw was found in util-linux. Improper hostname canonicalization in the login(1) utility, when invoked with the -h option, can modify the supplied remote hostname before setting PAM_RHOST. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based access controls.
  Upstream: util-linux/util-linux@8b29aeb

Co-authored-by: hudeng [email protected]
Generated-By: qwen3.6-35b
CVE: CVE-2026-13595 (medium) - libblkid: fix use-after-free in nested partition probing - The partitions list stores partitions in a contiguous array grown by reallocarray(). When the array is reallocated to a new address, all existing blkid_partition pointers become dangling.
Upstream: util-linux/util-linux@60ca861

Co-authored-by: hudeng [email protected]
Generated-By: qwen3.6-35b

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a Debian patch for CVE-2026-27456 to harden loop device handling against symlink attacks, and wires it into the packaging via changelog and series updates.

File-Level Changes

Change	Details	Files
Introduce a CVE-2026-27456 security patch that adds LOOPDEV_FL_NOFOLLOW handling to prevent symlink-based attacks in loop device context.	Create a new patch file implementing upstream commit 79164668a4, adding LOOPDEV_FL_NOFOLLOW usage in loop device setup code. Align Debian’s util-linux sources with the upstream security fix for CVE-2026-27456, ensuring loop backups cannot be replaced with symlinks to root-owned files.	debian/patches/CVE-2026-27456.patch
Integrate the new CVE patch into Debian packaging metadata.	Register the CVE-2026-27456 patch in debian/patches/series so it is applied during package build. Add a corresponding entry in debian/changelog describing the security fix and referencing CVE-2026-27456 and the upstream commit.	debian/changelog debian/patches/series

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign liujianqiang-niu for approval. For more information see the Code Review Process.

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[github-actions]

TAG Bot

TAG: 2.40.4-3deepin12
EXISTED: no
DISTRIBUTION: unstable

[sourcery-ai]

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

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[hudeng-go]

/integrate

[github-actions]

AutoIntegrationPr Bot
auto integrate with pr url: deepin-community/Repository-Integration#4364
PrNumber: 4364
PrBranch: auto-integration-29896383703