CVE-2026-98162 smb/server: fix tree connection leak in smb2_tree_connect()

What is CVE-2026-98162?

CVE-2026-98162 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

smb/server: fix tree connection leak in smb2_tree_connect()

See the procedure below:

smb2_tree_connect ksmbd_tree_conn_connect xa_store(&sess->tree_conns, tree_conn->id, tree_conn) ksmbd_counter_inc(KSMBD_COUNTER_TREE_CONNS) ksmbd_share_tree_conn_inc(sc) ksmbd_iov_pin_rsp // fail status.ret = KSMBD_TREE_CONN_STATUS_NOMEM // do not disconnect tree_conn

Disconnect the new tree connection if ksmbd_iov_pin_rsp() fails.

Weakness: CWE-401

Which versions are affected by CVE-2026-98162?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-98162?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-98162 being exploited?

There is no known exploitation of CVE-2026-98162 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-104312, BELL-CVE-2026-98162, DEBIAN-CVE-2026-98162, GHSA-x6qh-h8p9-5c4q, UBUNTU-CVE-2026-98162.