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: vsock: Keep the binding until socket     destruction Preserve sockets bindings; this includes both resulting from an explicit bind() and those     implicitly bound through autobind during connect(). Prevents socket unbinding during a transport     reassignment, which fixes a use-after-free: 1. vsock_create() (refcnt=1) calls vsock_insert_unbound()     (refcnt=2) 2. transport->release() calls vsock_remove_bound() without checking if sk was bound and moved     to bound list (refcnt=1) 3. vsock_bind() assumes sk is in unbound list and before
    __vsock_insert_bound(vsock_bound_sockets()) calls __vsock_remove_bound() which does:
    list_del_init(&vsk->bound_table); // nop sock_put(&vsk->sk); // refcnt=0 BUG: KASAN: slab-use-after-free     in __vsock_bind+0x62e/0x730 Read of size 4 at addr ffff88816b46a74c by task a.out/2057     dump_stack_lvl+0x68/0x90 print_report+0x174/0x4f6 kasan_report+0xb9/0x190 __vsock_bind+0x62e/0x730     vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0     entry_SYSCALL_64_after_hwframe+0x76/0x7e Allocated by task 2057: kasan_save_stack+0x1e/0x40     kasan_save_track+0x10/0x30 __kasan_slab_alloc+0x85/0x90 kmem_cache_alloc_noprof+0x131/0x450     sk_prot_alloc+0x5b/0x220 sk_alloc+0x2c/0x870 __vsock_create.constprop.0+0x2e/0xb60 vsock_create+0xe4/0x420
    __sock_create+0x241/0x650 __sys_socket+0xf2/0x1a0 __x64_sys_socket+0x6e/0xb0 do_syscall_64+0x93/0x1b0     entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 2057: kasan_save_stack+0x1e/0x40     kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x60 __kasan_slab_free+0x4b/0x70     kmem_cache_free+0x1a1/0x590 __sk_destruct+0x388/0x5a0 __vsock_bind+0x5e1/0x730 vsock_bind+0x97/0xe0
    __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0     entry_SYSCALL_64_after_hwframe+0x76/0x7e refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID:
    2057 at lib/refcount.c:25 refcount_warn_saturate+0xce/0x150 RIP: 0010:refcount_warn_saturate+0xce/0x150
    __vsock_bind+0x66d/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0     do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e refcount_t: underflow; use-after-free.
    WARNING: CPU: 7 PID: 2057 at lib/refcount.c:28 refcount_warn_saturate+0xee/0x150 RIP:
    0010:refcount_warn_saturate+0xee/0x150 vsock_remove_bound+0x187/0x1e0 __vsock_release+0x383/0x4a0     vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x359/0xa80     task_work_run+0x107/0x1d0 do_exit+0x847/0x2560 do_group_exit+0xb8/0x250 __x64_sys_exit_group+0x3a/0x50     x64_sys_call+0xfec/0x14f0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e     (CVE-2025-21756)

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

The version of kernel installed on the remote host is prior to 5.15.179-121.185. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2025-069 advisory.

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

    Squashfs: check the inode number is not the invalid value of zero (CVE-2024-26982)

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

    KVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS (CVE-2024-46830)

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

    pps: Fix a use-after-free (CVE-2024-57979)

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

    net: sched: Disallow replacing of child qdisc from one parent to another (CVE-2025-21700)

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

    net: avoid race between device unregistration and ethnl ops (CVE-2025-21701)

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

    padata: avoid UAF for reorder_work (CVE-2025-21726)

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

    padata: fix UAF in padata_reorder (CVE-2025-21727)

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

    nbd: don't allow reconnect after disconnect (CVE-2025-21731)

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

    btrfs: fix use-after-free when attempting to join an aborted transaction (CVE-2025-21753)

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

    vsock: Keep the binding until socket destruction (CVE-2025-21756)

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

    ipv6: mcast: add RCU protection to mld_newpack() (CVE-2025-21758)

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

    ndisc: extend RCU protection in ndisc_send_skb() (CVE-2025-21760)

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

    openvswitch: use RCU protection in ovs_vport_cmd_fill_info() (CVE-2025-21761)

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

    arp: use RCU protection in arp_xmit() (CVE-2025-21762)

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

    neighbour: use RCU protection in __neigh_notify() (CVE-2025-21763)

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

    ndisc: use RCU protection in ndisc_alloc_skb() (CVE-2025-21764)

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

    vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791)

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

    nfsd: clear acl_access/acl_default after releasing them (CVE-2025-21796)

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

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

An update of the linux package has been released.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2025-915 advisory.

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

    Squashfs: check the inode number is not the invalid value of zero (CVE-2024-26982)

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

    block, bfq: fix bfqq uaf in bfq_limit_depth() (CVE-2024-53166)

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

    cachefiles: Fix NULL pointer dereference in object->file (CVE-2024-56549)

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

    pps: Fix a use-after-free (CVE-2024-57979)

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

    net: sched: Disallow replacing of child qdisc from one parent to another (CVE-2025-21700)

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

    net: avoid race between device unregistration and ethnl ops (CVE-2025-21701)

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

    padata: avoid UAF for reorder_work (CVE-2025-21726)

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

    padata: fix UAF in padata_reorder (CVE-2025-21727)

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

    nbd: don't allow reconnect after disconnect (CVE-2025-21731)

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

    btrfs: fix use-after-free when attempting to join an aborted transaction (CVE-2025-21753)

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

    vsock: Keep the binding until socket destruction (CVE-2025-21756)

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

    ipv6: mcast: add RCU protection to mld_newpack() (CVE-2025-21758)

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

    ndisc: extend RCU protection in ndisc_send_skb() (CVE-2025-21760)

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

    openvswitch: use RCU protection in ovs_vport_cmd_fill_info() (CVE-2025-21761)

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

    arp: use RCU protection in arp_xmit() (CVE-2025-21762)

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

    neighbour: use RCU protection in __neigh_notify() (CVE-2025-21763)

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

    ndisc: use RCU protection in ndisc_alloc_skb() (CVE-2025-21764)

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

    vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791)

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

    nfsd: clear acl_access/acl_default after releasing them (CVE-2025-21796)

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

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

ID	Name	Product	Family	Published	Updated	Severity
230792	Linux Distros Unpatched Vulnerability : CVE-2025-21756	Nessus	Misc.	3/6/2025	3/6/2025	high
233694	Amazon Linux 2 : kernel (ALASKERNEL-5.15-2025-069)	Nessus	Amazon Linux Local Security Checks	4/1/2025	4/1/2025	high
233213	Photon OS 4.0: Linux PHSA-2025-4.0-0771	Nessus	PhotonOS Local Security Checks	3/22/2025	3/25/2025	high
233707	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2025-915)	Nessus	Amazon Linux Local Security Checks	4/1/2025	4/1/2025	high

Detections

Analytics

Plugins Search

high

high

high

high