In the Linux kernel, the following vulnerability has been resolved: pfcp: Destroy device along with udp socket's netns dismantle. pfcp_newlink() links the device to a list in dev_net(dev) instead of net, where a udp tunnel socket is created. Even when net is removed, the device stays alive on dev_net(dev). Then, removing net triggers the splat below. [0] In this example, pfcp0 is created in ns2, but the udp socket is created in ns1. ip netns add ns1 ip netns add ns2 ip -n ns1 link add netns ns2 name pfcp0 type pfcp ip netns del ns1 Let's link the device to the socket's netns instead. Now, pfcp_net_exit() needs another netdev iteration to remove all pfcp devices in the netns. pfcp_dev_list is not used under RCU, so the list API is converted to the non-RCU variant. pfcp_net_exit() can be converted to .exit_batch_rtnl() in net-next. [0]: ref_tracker: net notrefcnt@00000000128b34dc has 1/1 users at sk_alloc (./include/net/net_namespace.h:345 net/core/sock.c:2236) inet_create (net/ipv4/af_inet.c:326 net/ipv4/af_inet.c:252) __sock_create (net/socket.c:1558) udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18) pfcp_create_sock (drivers/net/pfcp.c:168) pfcp_newlink (drivers/net/pfcp.c:182 drivers/net/pfcp.c:197) rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012) rtnetlink_rcv_msg (net/core/rtnetlink.c:6922) netlink_rcv_skb (net/netlink/af_netlink.c:2542) netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347) netlink_sendmsg (net/netlink/af_netlink.c:1891) ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2583) ___sys_sendmsg (net/socket.c:2639) __sys_sendmsg (net/socket.c:2669) do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) WARNING: CPU: 1 PID: 11 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179) Modules linked in: CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.13.0-rc5-00147-g4c1224501e9d #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:179) Code: 00 00 00 fc ff df 4d 8b 26 49 bd 00 01 00 00 00 00 ad de 4c 39 f5 0f 85 df 00 00 00 48 8b 74 24 08 48 89 df e8 a5 cc 12 02 90 <0f> 0b 90 48 8d 6b 44 be 04 00 00 00 48 89 ef e8 80 de 67 ff 48 89 RSP: 0018:ff11000007f3fb60 EFLAGS: 00010286 RAX: 00000000000020ef RBX: ff1100000d6481e0 RCX: 1ffffffff0e40d82 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8423ee3c RBP: ff1100000d648230 R08: 0000000000000001 R09: fffffbfff0e395af R10: 0000000000000001 R11: 0000000000000000 R12: ff1100000d648230 R13: dead000000000100 R14: ff1100000d648230 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ff1100006ce80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005620e1363990 CR3: 000000000eeb2002 CR4: 0000000000771ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> ? __warn (kernel/panic.c:748) ? ref_tracker_dir_exit (lib/ref_tracker.c:179) ? report_bug (lib/bug.c:201 lib/bug.c:219) ? handle_bug (arch/x86/kernel/traps.c:285) ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./arch/x86/include/asm/irqflags.h:155 ./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) ? ref_tracker_dir_exit (lib/ref_tracker.c:179) ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:158) ? kfree (mm/slub.c:4613 mm/slub.c:4761) net_free (net/core/net_namespace.c:476 net/core/net_namespace.c:467) cleanup_net (net/cor ---truncated---

The remote Ubuntu 24.04 LTS / 24.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7448-1 advisory.

    It was discovered that the CIFS network file system implementation in the Linux kernel did not properly     verify the target namespace when handling upcalls. An attacker could use this to expose sensitive     information. (CVE-2025-2312)

    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:

    - GPIO subsystem;

    - GPU drivers;

    - IRQ chip drivers;

    - Network drivers;

    - Mellanox network drivers;

    - x86 platform drivers;

    - i.MX PM domains;

    - SCSI subsystem;

    - USB Serial drivers;

    - AFS file system;

    - GFS2 file system;

    - File systems infrastructure;

    - Proc file system;

    - SMB network file system;

    - Timer subsystem;

    - Kernel CPU control infrastructure;

    - Memory management;

    - Networking core;

    - Ethtool driver;

    - IEEE 802.15.4 subsystem;

    - Open vSwitch;

    - Network traffic control;

    - VMware vSockets driver; (CVE-2025-21694, CVE-2025-21993, CVE-2025-21684, CVE-2025-21681, CVE-2025-21675,     CVE-2025-21672, CVE-2025-21696, CVE-2025-21691, CVE-2025-21683, CVE-2025-21666, CVE-2025-21682,     CVE-2025-21697, CVE-2025-21668, CVE-2025-21701, CVE-2025-21670, CVE-2025-21676, CVE-2025-21695,     CVE-2025-21692, CVE-2025-21674, CVE-2025-21699, CVE-2024-57948, CVE-2025-21677, CVE-2024-57951,     CVE-2025-21702, CVE-2025-21700, CVE-2024-57949, CVE-2025-21669, CVE-2025-21703, CVE-2025-21756,     CVE-2025-21667, CVE-2024-57952, CVE-2024-57950, CVE-2025-21685, CVE-2025-21693, CVE-2025-21678,     CVE-2025-21665, CVE-2025-21680, CVE-2025-21689, CVE-2025-21690, CVE-2025-21673)

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 remote Ubuntu 24.04 LTS / 24.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7445-1 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:

    - GPIO subsystem;

    - GPU drivers;

    - IRQ chip drivers;

    - Network drivers;

    - Mellanox network drivers;

    - x86 platform drivers;

    - i.MX PM domains;

    - SCSI subsystem;

    - USB Serial drivers;

    - AFS file system;

    - GFS2 file system;

    - File systems infrastructure;

    - Proc file system;

    - SMB network file system;

    - Timer subsystem;

    - Kernel CPU control infrastructure;

    - Memory management;

    - Networking core;

    - Ethtool driver;

    - IEEE 802.15.4 subsystem;

    - Open vSwitch;

    - Network traffic control;

    - VMware vSockets driver; (CVE-2025-21685, CVE-2025-21684, CVE-2025-21756, CVE-2025-21670, CVE-2024-57949,     CVE-2025-21677, CVE-2025-21680, CVE-2025-21703, CVE-2024-57952, CVE-2025-21674, CVE-2025-21701,     CVE-2025-21691, CVE-2025-21689, CVE-2025-21668, CVE-2025-21665, CVE-2025-21683, CVE-2025-21675,     CVE-2025-21672, CVE-2024-57948, CVE-2025-21669, CVE-2025-21673, CVE-2025-21692, CVE-2025-21699,     CVE-2025-21702, CVE-2025-21682, CVE-2025-21690, CVE-2025-21681, CVE-2025-21695, CVE-2025-21696,     CVE-2025-21700, CVE-2025-21678, CVE-2025-21676, CVE-2024-57950, CVE-2025-21666, CVE-2025-21694,     CVE-2025-21693, CVE-2025-21993, CVE-2024-57951, CVE-2025-21697, CVE-2025-21667)

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.

  - In the Linux kernel, the following vulnerability has been resolved: pfcp: Destroy device along with udp     socket's netns dismantle. pfcp_newlink() links the device to a list in dev_net(dev) instead of net, where     a udp tunnel socket is created. Even when net is removed, the device stays alive on dev_net(dev). Then,     removing net triggers the splat below. [0] In this example, pfcp0 is created in ns2, but the udp socket is     created in ns1. ip netns add ns1 ip netns add ns2 ip -n ns1 link add netns ns2 name pfcp0 type pfcp ip     netns del ns1 Let's link the device to the socket's netns instead. Now, pfcp_net_exit() needs another     netdev iteration to remove all pfcp devices in the netns. pfcp_dev_list is not used under RCU, so the list     API is converted to the non-RCU variant. pfcp_net_exit() can be converted to .exit_batch_rtnl() in net-     next. [0]: ref_tracker: net notrefcnt@00000000128b34dc has 1/1 users at sk_alloc     (./include/net/net_namespace.h:345 net/core/sock.c:2236) inet_create (net/ipv4/af_inet.c:326     net/ipv4/af_inet.c:252) __sock_create (net/socket.c:1558) udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18)     pfcp_create_sock (drivers/net/pfcp.c:168) pfcp_newlink (drivers/net/pfcp.c:182 drivers/net/pfcp.c:197)     rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012)     rtnetlink_rcv_msg (net/core/rtnetlink.c:6922) netlink_rcv_skb (net/netlink/af_netlink.c:2542)     netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347) netlink_sendmsg     (net/netlink/af_netlink.c:1891) ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2583)
    ___sys_sendmsg (net/socket.c:2639) __sys_sendmsg (net/socket.c:2669) do_syscall_64     (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) entry_SYSCALL_64_after_hwframe     (arch/x86/entry/entry_64.S:130) WARNING: CPU: 1 PID: 11 at lib/ref_tracker.c:179 ref_tracker_dir_exit     (lib/ref_tracker.c:179) Modules linked in: CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted     6.13.0-rc5-00147-g4c1224501e9d #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS     rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: netns cleanup_net RIP:
    0010:ref_tracker_dir_exit (lib/ref_tracker.c:179) Code: 00 00 00 fc ff df 4d 8b 26 49 bd 00 01 00 00 00 00     ad de 4c 39 f5 0f 85 df 00 00 00 48 8b 74 24 08 48 89 df e8 a5 cc 12 02 90 <0f> 0b 90 48 8d 6b 44 be 04 00     00 00 48 89 ef e8 80 de 67 ff 48 89 RSP: 0018:ff11000007f3fb60 EFLAGS: 00010286 RAX: 00000000000020ef RBX:
    ff1100000d6481e0 RCX: 1ffffffff0e40d82 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8423ee3c     RBP: ff1100000d648230 R08: 0000000000000001 R09: fffffbfff0e395af R10: 0000000000000001 R11:
    0000000000000000 R12: ff1100000d648230 R13: dead000000000100 R14: ff1100000d648230 R15: dffffc0000000000     FS: 0000000000000000(0000) GS:ff1100006ce80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000     CR0: 0000000080050033 CR2: 00005620e1363990 CR3: 000000000eeb2002 CR4: 0000000000771ef0 DR0:
    0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe07f0     DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> ? __warn (kernel/panic.c:748) ?     ref_tracker_dir_exit (lib/ref_tracker.c:179) ? report_bug (lib/bug.c:201 lib/bug.c:219) ? handle_bug     (arch/x86/kernel/traps.c:285) ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) ?     asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) ? _raw_spin_unlock_irqrestore     (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97     ./arch/x86/include/asm/irqflags.h:155 ./include/linux/spinlock_api_smp.h:151     kernel/locking/spinlock.c:194) ? ref_tracker_dir_exit (lib/ref_tracker.c:179) ? __pfx_ref_tracker_dir_exit     (lib/ref_tracker.c:158) ? kfree (mm/slub.c:4613 mm/slub.c:4761) net_free (net/core/net_namespace.c:476     net/core/net_namespace.c:467) cleanup_net (net/cor ---truncated--- (CVE-2025-21677)

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

ID	Name	Product	Family	Severity
234778	Ubuntu 24.04 LTS / 24.10 : Linux kernel vulnerabilities (USN-7448-1)	Nessus	Ubuntu Local Security Checks	high
234757	Ubuntu 24.04 LTS / 24.10 : Linux kernel vulnerabilities (USN-7445-1)	Nessus	Ubuntu Local Security Checks	high
230688	Linux Distros Unpatched Vulnerability : CVE-2025-21677	Nessus	Misc.	medium

Detections

Analytics

CVE-2025-21677

medium

Tenable Plugins

high

high

medium