fkie_cve-2025-37835

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

GHSA-jq24-w46r-q4x4

In the Linux kernel, the following vulnerability has been resolved:

smb: client: Fix netns refcount imbalance causing leaks and use-after-free

Commit ef7134c7fc48 ("smb: client: Fix use-after-free of network namespace.") attempted to fix a netns use-after-free issue by manually adjusting reference counts via sk->sk_net_refcnt and sock_inuse_add().

However, a later commit e9f2517a3e18 ("smb: client: fix TCP timers deadlock after rmmod") pointed out that the approach of manually setting sk->sk_net_refcnt in the first commit was technically incorrect, as sk->sk_net_refcnt should only be set for user sockets. It led to issues like TCP timers not being cleared properly on close. The second commit moved to a model of just holding an extra netns reference for server->ssocket using get_net(), and dropping it when the server is torn down.

But there remain some gaps in the get_net()/put_net() balancing added by these commits. The incomplete reference handling in these fixes results in two issues:

1. Netns refcount leaks[1]

The problem process is as follows:

``` mount.cifs cifsd

cifs_do_mount cifs_mount cifs_mount_get_session cifs_get_tcp_session get_net() /* First get net. */ ip_connect generic_ip_connect /* Try port 445 */ get_net() ->connect() /* Failed */ put_net() generic_ip_connect /* Try port 139 */ get_net() /* Missing matching put_net() for this get_n…

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bdu:2026-02529

fkie_cve-2025-37835

GHSA-jq24-w46r-q4x4