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

  - openvswitch: only skb_tx_error() a packet we are about to drop queue_userspace_packet() borrows the packet     skb -- it only copies it into a private netlink message (user_skb) and does not own it; on return     do_execute_actions() keeps forwarding it through the flow's remaining actions. Its error path nevertheless     calls skb_tx_error(skb), which via skb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY,     stripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc says skb must be freed     afterwards). For a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is what makes     esp_input() skb_cow_data() before in-place AEAD; once it is stripped a later local ESP-in-UDP delivery     decrypts in place over pages the sender does not own -- an unprivileged page-cache write (the Fragnesia     primitive). do_execute_actions() ignores output_userspace()'s return value, so any action after a failed     USERSPACE upcall inherits the stripped skb. Move the skb_tx_error() to the flow-miss drop path - the     default branch of ovs_dp_process_packet()'s switch(error), before kfree_skb(). The call has been here     since commit 36d5fe6a0007 (core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors)     but was harmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate in-place decrypt; only then     did stripping it on a still-forwarded skb become a page-cache write primitive. (CVE-2026-89487)

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

The CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS-STREAM8:CLSA-2026:1791780738 advisory.

  - In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in     shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure     that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs     don't hold their own references to pages that are mirrored over, so failing to notify them can lead to     page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b     (khugepaged: add support of collapse for tmpfs/shmem pages), but most of the security impact of this     only came in commit 27e1f8273113 (khugepaged: enable collapse pmd for pte-mapped THP), which actually     omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.
    (CVE-2022-48991)

  - In the Linux kernel, the following vulnerability has been resolved: virtio_net: fix xdp_rxq_info bug after     suspend/resume The following sequence currently causes a driver bug warning when using virtio_net: # ip     link set eth0 up # echo mem > /sys/power/state (or e.g. # rtcwake -s 10 -m mem) <resume> # ip link set     eth0 down Missing register, driver bug WARNING: CPU: 0 PID: 375 at net/core/xdp.c:138     xdp_rxq_info_unreg+0x58/0x60 Call trace: xdp_rxq_info_unreg+0x58/0x60 virtnet_close+0x58/0xac
    __dev_close_many+0xac/0x140 __dev_change_flags+0xd8/0x210 dev_change_flags+0x24/0x64     do_setlink+0x230/0xdd0 ... This happens because virtnet_freeze() frees the receive_queue completely     (including struct xdp_rxq_info) but does not call xdp_rxq_info_unreg(). Similarly, virtnet_restore() sets     up the receive_queue again but does not call xdp_rxq_info_reg(). Actually, parts of virtnet_freeze_down()     and virtnet_restore_up() are almost identical to virtnet_close() and virtnet_open(): only the calls to     xdp_rxq_info_(un)reg() are missing. This means that we can fix this easily and avoid such problems in the     future by just calling virtnet_close()/open() from the freeze/restore handlers. Aside from adding the     missing xdp_rxq_info calls the only difference is that the refill work is only cancelled if     netif_running(). However, this should not make any functional difference since the refill work should only     be active if the network interface is actually up. (CVE-2022-49687)

  - In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix repeated calls to     sock_put() when msg has more_data In tcp_bpf_send_verdict() redirection, the eval variable is assigned to
    __SK_REDIRECT after the apply_bytes data is sent, if msg has more_data, sock_put() will be called multiple     times. We should reset the eval variable to __SK_NONE every time more_data starts. This causes: IPv4:
    Attempt to release TCP socket in state 1 00000000b4c925d7 ------------[ cut here ]------------ refcount_t:
    addition on 0; use-after-free. WARNING: CPU: 5 PID: 4482 at lib/refcount.c:25     refcount_warn_saturate+0x7d/0x110 Modules linked in: CPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded     Not tainted 6.0.0 #1 Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014 Call Trace: <TASK>
    __tcp_transmit_skb+0xa1b/0xb90 ? __alloc_skb+0x8c/0x1a0 ? __kmalloc_node_track_caller+0x184/0x320     tcp_write_xmit+0x22a/0x1110 __tcp_push_pending_frames+0x32/0xf0 do_tcp_sendpages+0x62d/0x640     tcp_bpf_push+0xae/0x2c0 tcp_bpf_sendmsg_redir+0x260/0x410 ? preempt_count_add+0x70/0xa0     tcp_bpf_send_verdict+0x386/0x4b0 tcp_bpf_sendmsg+0x21b/0x3b0 sock_sendmsg+0x58/0x70
    __sys_sendto+0xfa/0x170 ? xfd_validate_state+0x1d/0x80 ? switch_fpu_return+0x59/0xe0
    __x64_sys_sendto+0x24/0x30 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd     (CVE-2022-50536)

  - In the Linux kernel, the following vulnerability has been resolved: crypto: scomp - fix req->dst buffer     overflow The req->dst buffer size should be checked before copying from the scomp_scratch->dst to avoid     req->dst buffer overflow problem. (CVE-2023-52612)

  - In the Linux kernel, the following vulnerability has been resolved: net: atlantic: eliminate double free     in error handling logic Driver has a logic leak in ring data allocation/free, where aq_ring_free could be     called multiple times on same ring, if system is under stress and got memory allocation error. Ring     pointer was used as an indicator of failure, but this is not correct since only ring data is     allocated/deallocated. Ring itself is an array member. Changing ring allocation functions to return error     code directly. This simplifies error handling and eliminates aq_ring_free on higher layer.
    (CVE-2023-52664)

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
345037	Linux Distros Unpatched Vulnerability : CVE-2026-89487	Nessus	Misc.	2026/9/12	2026/11/11	high
376443	Ubuntu 24.04 LTS / 26.04 LTS : Linux kernel vulnerabilities (USN-8959-1)	Nessus	Ubuntu Local Security Checks	2026/11/5	2026/11/5	high
364675	CentOS Linux 8 [TuxCare] Security Update: bpftool / kernel / kernel-core / kernel-cross-headers / etc Multiple Vulnerabilities (CENTOS-STREAM8:CLSA-2026:1791780738)	Nessus	CentOS Local Security Checks	2026/10/12	2026/10/12	high
377778	Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel (NVIDIA Tegra) vulnerabilities (USN-8963-1)	Nessus	Ubuntu Local Security Checks	2026/11/9	2026/11/9	high
375048	Photon OS 5.0: Linux PHSA-2026-5.0-92-0999	Nessus	PhotonOS Local Security Checks	2026/11/2	2026/11/2	high

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