In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races.

The remote Ubuntu 24.04 LTS / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8816-1 advisory.

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - ARM64 architecture;

    - S390 architecture;

    - x86 architecture;

    - DRBD Distributed Replicated Block Device drivers;

    - InfiniBand drivers;

    - IOMMU subsystem;

    - Multiple devices driver;

    - Network drivers;

    - Microsoft Azure Network Adapter (MANA) driver;

    - NVME drivers;

    - TCM subsystem;

    - Virtio Host (VHOST) subsystem;

    - Xen hypervisor drivers;

    - AFS file system;

    - File systems infrastructure;

    - Network file systems library;

    - Network file system (NFS) client;

    - NTFS3 file system;

    - OCFS2 file system;

    - OrangeFS file system;

    - SMB network file system;

    - IPv4 networking;

    - Sun RPC protocol;

    - IPv6 networking;

    - IP tunnels definitions;

    - Netfilter;

    - TCP network protocol;

    - Locking primitives;

    - 9P file system network protocol;

    - B.A.T.M.A.N. meshing protocol;

    - Networking core;

    - IFE protocol;

    - RxRPC session sockets;

    - Network traffic control;

    - SCTP protocol;

    - SMC sockets;

    - TIPC protocol;

    - XFRM subsystem; (CVE-2026-64530, CVE-2026-64534, CVE-2026-64535, CVE-2026-64541, CVE-2026-64551,     CVE-2026-68083, CVE-2026-68457, CVE-2026-68476, CVE-2026-68477, CVE-2026-72014, CVE-2026-72020,     CVE-2026-72033, CVE-2026-72041, CVE-2026-72046, CVE-2026-72064, CVE-2026-72065, CVE-2026-72069,     CVE-2026-72083, CVE-2026-72084, CVE-2026-72085, CVE-2026-72098, CVE-2026-72129, CVE-2026-72130,     CVE-2026-72137, CVE-2026-72139, CVE-2026-72191, CVE-2026-72192, CVE-2026-72194, CVE-2026-72217,     CVE-2026-72220, CVE-2026-72221, CVE-2026-72222, CVE-2026-72226, CVE-2026-72234, CVE-2026-72248,     CVE-2026-72249, CVE-2026-72251, CVE-2026-72277, CVE-2026-72278, CVE-2026-72279, CVE-2026-72287,     CVE-2026-72288, CVE-2026-72289, CVE-2026-72296, CVE-2026-72299, CVE-2026-72317, CVE-2026-72318,     CVE-2026-72319, CVE-2026-72320, CVE-2026-72322, CVE-2026-72323, CVE-2026-72329, CVE-2026-72339,     CVE-2026-72348, CVE-2026-72351, CVE-2026-72355, CVE-2026-72366, CVE-2026-72381, CVE-2026-72393,     CVE-2026-72398, CVE-2026-72399, CVE-2026-72412, CVE-2026-72417, CVE-2026-72422, CVE-2026-72429,     CVE-2026-72436, CVE-2026-72442, CVE-2026-72451, CVE-2026-72463, CVE-2026-72466, CVE-2026-72472,     CVE-2026-72473, CVE-2026-72477, CVE-2026-72491, CVE-2026-72493, CVE-2026-72494, CVE-2026-72495,     CVE-2026-72496, CVE-2026-72501, CVE-2026-74255, CVE-2026-74267, CVE-2026-74268, CVE-2026-74269,     CVE-2026-74287, CVE-2026-74310, CVE-2026-74345, CVE-2026-74350, CVE-2026-74361, CVE-2026-74376,     CVE-2026-74384, CVE-2026-74394, CVE-2026-74398, CVE-2026-74401, CVE-2026-74406, CVE-2026-74427,     CVE-2026-74428, CVE-2026-74433, CVE-2026-74434, CVE-2026-74436, CVE-2026-74439, CVE-2026-80665)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until     after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device     reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's     reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below:
    unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix     refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection     over xfrm_rcv_cb and transport_finish to prevent races. (CVE-2026-72463)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
350177	Ubuntu 24.04 LTS / 26.04 LTS : Linux kernel vulnerabilities (USN-8816-1)	Nessus	Ubuntu Local Security Checks	Local	critical
347900	SUSE SLED15 / SLES15 : Security update for the Linux Kernel (SUSE-SU-2026:4254-1)	Nessus	SuSE Local Security Checks	Local	high
335613	Linux Distros Unpatched Vulnerability : CVE-2026-72463	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-72463

critical

Tenable Plugins

critical

high

critical