fix(cve): CVE-2026-27456 - loopdev: add LOOPDEV_FL_NOFOLLOW to prevent symlink attacks by deepin-ci-robot · Pull Request #21 · deepin-community/util-linux

deepin-ci-robot · 2026-07-17T08:48:21Z

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

…t symlink attacks 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

sourcery-ai · 2026-07-17T08:48:29Z

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 · 2026-07-17T08:48:32Z

[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 · 2026-07-17T08:48:40Z

TAG Bot

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

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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

…tition probing 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

hudeng-go · 2026-07-22T06:19:03Z

/integrate

github-actions · 2026-07-22T06:19:35Z

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

deepin-ci-robot added cve generated-by-ai labels Jul 17, 2026

deepin-ci-robot requested a review from myml July 17, 2026 08:48

sourcery-ai Bot reviewed Jul 17, 2026

View reviewed changes

deepin-ci-robot and others added 2 commits July 21, 2026 08:37

deepin-community-ci-bot Bot mentioned this pull request Jul 22, 2026

auto integration deepin-community/util-linux deepin-community/Repository-Integration#4364

Open

Zeno-sole merged commit 5db3704 into master Jul 22, 2026
7 of 9 checks passed

This was referenced Jul 22, 2026

fix(util-linux): fix 4 CVE vulnerabilities #20

Open

fix(util-linux): CVE-2026-27456, CVE-2026-3184 #19

Open

feat: update util-linux to 2.40.4-5 #16

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fix(cve): CVE-2026-27456 - loopdev: add LOOPDEV_FL_NOFOLLOW to prevent symlink attacks - #21

fix(cve): CVE-2026-27456 - loopdev: add LOOPDEV_FL_NOFOLLOW to prevent symlink attacks#21
Zeno-sole merged 3 commits into
masterfrom
fix-cve/CVE-2026-27456

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