CentOS Linux 8.4 [TuxCare] セキュリティ更新プログラム:bpftool/kernel/kernel-core/kernel-cross-headers/etcの複数の脆弱性(CENTOS8.4:CLSA-2026:1792243729)
high Nessus プラグイン ID 366779
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概要
CentOS Linux ホストに 1 つ以上のセキュリティ更新プログラムが欠落しています。説明
CentOS Linux 8.4 ホストには、TuxCare CENTOS8.4:CLSA-2026:1792243729アドバイザリに記載されている複数の脆弱性の影響を受けるパッケージがインストールされています。- 5.14.15 より前の Linux カーネルで問題が発見されました。drivers/isdn/capi/kcapi.c の detach_capi_ctr 関数に array-index-out-of-boundsの欠陥があります。(CVE-2021-43389)
- Linux カーネルでは、以下の脆弱性が解決されています: 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)
- Linux カーネルでは、以下の脆弱性が解決されています: 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)
- Linux カーネルでは、以下の脆弱性が解決されています: 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)
- Linux カーネルでは、以下の脆弱性が解決されています: 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)
Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ依存していることに注意してください。
ソリューション
TuxCareアドバイザリCENTOS8.4:CLSA-2026:1792243729のガイダンスに基づいて、影響を受けるパッケージを更新してください。参考資料
プラグインの詳細
深刻度: High
ID: 366779
ファイル名: tuxcare_centos_8.4_CLSA-2026-1792243729.nasl
バージョン: 1.1
タイプ: Local
エージェント: unix
ファミリー: CentOS Local Security Checks
公開日: 2026/10/17
更新日: 2026/10/17
サポートされているセンサー: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
リスク情報
VPR
リスクファクター: High
スコア: 8
パーセンタイル: 99.69
Vendor
Vendor Severity: Critical
CVSS v2
リスクファクター: Low
基本値: 2.1
現状値: 1.6
ベクトル: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P
CVSS スコアのソース: CVE-2021-43389
CVSS v3
リスクファクター: High
基本値: 7.8
現状値: 7
ベクトル: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
現状ベクトル: CVSS:3.0/E:P/RL:O/RC:C
CVSS スコアのソース: CVE-2026-53136
脆弱性情報
必要な KB アイテム: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party
エクスプロイトが利用可能: true
エクスプロイトの容易さ: Exploits are available
パッチ公開日: 2026/10/17
脆弱性公開日: 2021/7/21
参照情報
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