CentOS Linux 8.4 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers 等多個弱點 （CENTOS8.4：CLSA-2026：1792243729）
high Nessus Plugin ID 366779
語言:
概要
CentOS Linux 主機缺少一個或多個安全性更新。說明
CentOS Linux 8.4 主機已安裝的套件會受到 TuxCare CENTOS8.4：CLSA-2026：1792243729 公告中提及的多個弱點影響。- 在 5.14.15 版之前的 Linux 核心中發現一個問題。drivers/isdn/capi/kcapi.c 的 detach_capi_ctr 函式中存在一個 array-index-out-of-bounds 缺陷。(CVE-2021-43389)
- 已解決 Linux 核心中的下列弱點：isdn: cpai: check ctr->cnr to avoid array index out of bound The cmtp_add_connection() would add a cmtp session to a controller and run a kernel thread to process cmtp. __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, kcmtpd_ctr_%d, session->num); During this process, the kernel thread would call detach_capi_ctr() to detach a register controller. if the controller was not attached yet, detach_capi_ctr() would trigger an array-index-out-bounds bug. [ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted 5.15.0-rc2+ #8 [46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [46.870107][ T6479] Call Trace: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48 [ 46.872135][T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ?
__init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479] (CVE-2021-4439)
- 已解決 Linux 核心中的下列弱點：Drivers: hv: vmbus: Use after free in
__vmbus_open() The open_info variable is added to the &vmbus_connection.chn_msg_list, but the error handling frees open_info without removing it from the list. This will result in a use after free. First remove it from the list, and then free it. (CVE-2021-47049)
- 已解決 Linux 核心中的下列弱點：scsi: mpt3sas: Fix kernel panic during drive powercycle test While looping over shost's sdev list it is possible that one of the drives is getting removed and its sas_target object is freed but its sdev object remains intact. Consequently, a kernel panic can occur while the driver is trying to access the sas_address field of sas_target object without also checking the sas_target object for NULL. (CVE-2021-47565)
- 已解決 Linux 核心中的下列弱點：igbvf: fix double free in `igbvf_probe` In `igbvf_probe`, if register_netdev() fails, the program will go to label err_hw_init, and then to label err_ioremap. In free_netdev() which is just below label err_ioremap, there is `list_for_each_entry_safe` and `netif_napi_del` which aims to delete all entries in `dev->napi_list`. The program has added an entry `adapter->rx_ring->napi` which is added by `netif_napi_add` in igbvf_alloc_queues(). However, adapter->rx_ring has been freed below label err_hw_init. So this a UAF. In terms of how to patch the problem, we can refer to igbvf_remove() and delete the entry before `adapter->rx_ring`. The KASAN logs are as follows: [ 35.126075] BUG: KASAN: use-after-free in free_netdev+0x1fd/0x450 [ 35.127170] Read of size 8 at addr ffff88810126d990 by task modprobe/366 [35.128360] [ 35.128643] CPU: 1 PID: 366 Comm: modprobe Not tainted 5.15.0-rc2+ #14 [ 35.129789] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [35.131749] Call Trace: [ 35.132199] dump_stack_lvl+0x59/0x7b [ 35.132865] print_address_description+0x7c/0x3b0 [ 35.133707] ? free_netdev+0x1fd/0x450 [ 35.134378]
__kasan_report+0x160/0x1c0 [ 35.135063] ? free_netdev+0x1fd/0x450 [ 35.135738] kasan_report+0x4b/0x70 [35.136367] free_netdev+0x1fd/0x450 [ 35.137006] igbvf_probe+0x121d/0x1a10 [igbvf] [ 35.137808] ? igbvf_vlan_rx_add_vid+0x100/0x100 [igbvf] [ 35.138751] local_pci_probe+0x13c/0x1f0 [ 35.139461] pci_device_probe+0x37e/0x6c0 [ 35.165526] [ 35.165806] Allocated by task 366: [ 35.166414]
____kasan_kmalloc+0xc4/0xf0 [ 35.167117] foo_kmem_cache_alloc_trace+0x3c/0x50 [igbvf] [ 35.168078] igbvf_probe+0x9c5/0x1a10 [igbvf] [ 35.168866] local_pci_probe+0x13c/0x1f0 [ 35.169565] pci_device_probe+0x37e/0x6c0 [ 35.179713] [ 35.179993] Freed by task 366: [ 35.180539] kasan_set_track+0x4c/0x80 [ 35.181211] kasan_set_free_info+0x1f/0x40 [ 35.181942]
____kasan_slab_free+0x103/0x140 [ 35.182703] kfree+0xe3/0x250 [ 35.183239] igbvf_probe+0x1173/0x1a10 [igbvf] [ 35.184040] local_pci_probe+0x13c/0x1f0 (CVE-2021-47589)
請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。
解決方案
根據 TuxCare 公告 CENTOS8.4：CLSA-2026：1792243729 中的指引更新受影響的套件。另請參閱
Plugin 詳細資訊
嚴重性: High
ID: 366779
檔案名稱: tuxcare_centos_8.4_CLSA-2026-1792243729.nasl
版本: 1.1
類型: Local
代理程式: unix
已發布: 2026/10/17
已更新: 2026/10/17
支援的感應器: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
風險資訊
VPR
風險因素: High
分數: 8
百分位數: 99.69
Vendor
Vendor Severity: Critical
CVSS v2
風險因素: Low
基本分數: 2.1
時間性分數: 1.6
媒介: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P
CVSS 評分資料來源: CVE-2021-43389
CVSS v3
風險因素: High
基本分數: 7.8
時間性分數: 7
媒介: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
時間媒介: CVSS:3.0/E:P/RL:O/RC:C
CVSS 評分資料來源: CVE-2026-53136
弱點資訊
必要的 KB 項目: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party
可被惡意程式利用: true
可輕鬆利用: Exploits are available
修補程式發佈日期: 2026/10/17
弱點發布日期: 2021/7/21
參考資訊
CVE: CVE-2021-43389, CVE-2021-4439, CVE-2021-47049, CVE-2021-47565, CVE-2021-47589, CVE-2022-48686, CVE-2023-2162, CVE-2023-52515, CVE-2023-52935, CVE-2023-52974, CVE-2024-56558, CVE-2025-38361, CVE-2026-43304, CVE-2026-43493, CVE-2026-46006, CVE-2026-46209, CVE-2026-46294, CVE-2026-52993, CVE-2026-52998, CVE-2026-53136, CVE-2026-53138, CVE-2026-63801, CVE-2026-63829, CVE-2026-64109, CVE-2026-64115, CVE-2026-64320, CVE-2026-68142, CVE-2026-68202, CVE-2026-68365, CVE-2026-68398, CVE-2026-68414, CVE-2026-74589, CVE-2026-74609, CVE-2026-74641, CVE-2026-74667, CVE-2026-74669, CVE-2026-74689, CVE-2026-74700, CVE-2026-74744, CVE-2026-74752, CVE-2026-80576, CVE-2026-90103, CVE-2026-90203, CVE-2026-90334, CVE-2026-90382, CVE-2026-93054, CVE-2026-93262, CVE-2026-97536, CVE-2026-97540, CVE-2026-97608, CVE-2026-98354, CVE-2026-98375, CVE-2026-99999
CLSA: 2026:1792243729