Bug 2297522 (CVE-2024-40938) - CVE-2024-40938 kernel: landlock: Fix d_parent walk
Summary: CVE-2024-40938 kernel: landlock: Fix d_parent walk
Keywords:
Status: NEW
Alias: CVE-2024-40938
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-07-12 13:36 UTC by OSIDB Bzimport
Modified: 2024-07-26 05:15 UTC (History)
4 users (show)

Fixed In Version: kernel 6.1.95, kernel 6.6.35, kernel 6.9.6, kernel 6.10-rc2
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Description OSIDB Bzimport 2024-07-12 13:36:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

landlock: Fix d_parent walk

The WARN_ON_ONCE() in collect_domain_accesses() can be triggered when
trying to link a root mount point.  This cannot work in practice because
this directory is mounted, but the VFS check is done after the call to
security_path_link().

Do not use source directory's d_parent when the source directory is the
mount point.

[mic: Fix commit message]
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