CVE-2025-38711

Name	CVE-2025-38711
Description	In the Linux kernel, the following vulnerability has been resolved: smb/server: avoid deadlock when linking with ReplaceIfExists If smb2_create_link() is called with ReplaceIfExists set and the name does exist then a deadlock will happen. ksmbd_vfs_kern_path_locked() will return with success and the parent directory will be locked. ksmbd_vfs_remove_file() will then remove the file. ksmbd_vfs_link() will then be called while the parent is still locked. It will try to lock the same parent and will deadlock. This patch moves the ksmbd_vfs_kern_path_unlock() call to before ksmbd_vfs_link() and then simplifies the code, removing the file_present flag variable.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	fixed
	bullseye (security)	5.10.237-1	fixed
	bookworm	6.1.148-1	vulnerable
	bookworm (security)	6.1.147-1	vulnerable
	trixie	6.12.43-1	fixed
	trixie (security)	6.12.41-1	vulnerable
	forky, sid	6.16.7-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
linux	source	bullseye	(not affected)
linux	source	trixie	6.12.43-1
linux	source	(unstable)	6.16.3-1

[bullseye] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 (6.17-rc1)