Bug 2383449 (CVE-2025-38431)

Summary: CVE-2025-38431 kernel: Linux kernel: Denial of Service in SMB client due to native symlink handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Server Message Block (SMB) client. A local user could exploit this vulnerability when backup or copy tools interact with native SMB symlinks that the client cannot parse. This issue causes these tools to fail, leading to a denial of service (DoS) for affected operations.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-07-25 15:01:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix regression with native SMB symlinks

Some users and customers reported that their backup/copy tools started
to fail when the directory being copied contained symlink targets that
the client couldn't parse - even when those symlinks weren't followed.

Fix this by allowing lstat(2) and readlink(2) to succeed even when the
client can't resolve the symlink target, restoring old behavior.
Comment 1 Jon Moroney 2025-07-25 18:08:42 UTC Comment hidden (spam)