CentOS Linux 8 [TuxCare] セキュリティ更新:bpftool/kernel/kernel-core/kernel-cross-headers/etcの複数の脆弱性(CENTOS-STREAM8:CLSA-2026:1777614769)
high Nessus プラグイン ID 361340
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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ありません。説明
CentOS Linux 8ホストには、TuxCare CENTOS-STREAM8:CLSA-2026:1777614769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。- Linux カーネルでは、以下の脆弱性が解決されています: asix: fix uninit-value in asix_mdio_read() asix_read_cmd() may read less than sizeof(smsr) bytes and in this case smsr will be uninitialized. Fail log: BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] drivers/net/usb/asix_common.c:497 BUG: KMSAN: uninit-value in asix_mdio_read+0x3c1/0xb00 drivers/net/usb/asix_common.c:497 drivers/net/usb/asix_common.c:497 asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] drivers/net/usb/asix_common.c:497 asix_mdio_read+0x3c1/0xb00 drivers/net/usb/asix_common.c:497 drivers/net/usb/asix_common.c:497 (CVE-2021-47101)
- Linux カーネルでは、以下の脆弱性が解決されています: NFSD: Protect against send buffer overflow in NFSv2 READ Since before the git era, NFSD has conserved the number of pages held by each nfsd thread by combining the RPC receive and send buffers into a single array of pages. This works because there are no cases where an operation needs a large RPC Call message and a large RPC Reply at the same time. Once an RPC Call has been received, svc_process() updates svc_rqst::rq_res to describe the part of rq_pages that can be used for constructing the Reply. This means that the send buffer (rq_res) shrinks when the received RPC record containing the RPC Call is large. A client can force this shrinkage on TCP by sending a correctly- formed RPC Call header contained in an RPC record that is excessively large. The full maximum payload size cannot be constructed in that case. (CVE-2022-50410)
- Linux カーネルでは、以下の脆弱性が解決されています: scsi: libsas: Fix use-after-free bug in smp_execute_task_sg() When executing SMP task failed, the smp_execute_task_sg() calls del_timer() to delete slow_task->timer. However, if the timer handler sas_task_internal_timedout() is running, the del_timer() in smp_execute_task_sg() will not stop it and a UAF will happen. The process is shown below:
(thread 1) | (thread 2) smp_execute_task_sg() | sas_task_internal_timedout() ... | del_timer() | ... | ...
sas_free_task(task) | kfree(task->slow_task) //FREE| | task->slow_task->... //USE Fix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure the timer handler have finished before the task->slow_task is deallocated. (CVE-2022-50422)
- Linux カーネルでは、以下の脆弱性が解決されています: ext4: fix use-after-free in ext4_orphan_cleanup I caught a issue as follows:
================================================================== BUG: KASAN: use-after-free in
__list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710 CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ================================================================== Above issue may happen as follows:
------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.
(CVE-2022-50673)
- Linux カーネルでは、以下の脆弱性が解決されています: VMCI: check context->notify_page after call to get_user_pages_fast() to avoid GPF The call to get_user_pages_fast() in vmci_host_setup_notify() can return NULL context->notify_page causing a GPF. To avoid GPF check if context->notify_page == NULL and return error if so. general protection fault, probably for non-canonical address 0xe0009d1000000060: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0x0005088000000300-0x0005088000000307] CPU: 2 PID: 26180 Comm: repro_34802241 Not tainted 6.1.0-rc4 #1 Hardware name: Red Hat KVM, BIOS 1.15.0-2.module+el8.6.0 04/01/2014 RIP: 0010:vmci_ctx_check_signal_notify+0x91/0xe0 Call Trace:
<TASK> vmci_host_unlocked_ioctl+0x362/0x1f40 __x64_sys_ioctl+0x1a1/0x230 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd (CVE-2023-53259)
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CENTOS-STREAM8:CLSA-2026:1777614769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: 361340
ファイル名: tuxcare_centos_8_CLSA-2026-1777614769.nasl
バージョン: 1.2
タイプ: Local
エージェント: unix
ファミリー: CentOS Local Security Checks
公開日: 2026/10/1
更新日: 2026/10/2
サポートされているセンサー: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
リスク情報
VPR
リスクファクター: Critical
スコア: 9.5
パーセンタイル: 99.87
Vendor
Vendor Severity: Important
CVSS v2
リスクファクター: Medium
基本値: 6.8
現状値: 5.9
ベクトル: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS スコアのソース: CVE-2025-38685
CVSS v3
リスクファクター: High
基本値: 7.8
現状値: 7.5
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:H/RL:O/RC:C
CVSS v4
リスクファクター: High
Base Score: 8.6
Threat Score: 8.6
Threat Vector: CVSS:4.0/E:A
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS スコアのソース: CVE-2026-31431
脆弱性情報
必要な KB アイテム: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
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: 2026/5/1
脆弱性公開日: 2021/7/21
CISA の既知の悪用された脆弱性の期限日: 2026/5/15
エクスプロイト可能
Core Impact
Metasploit (Copy Fail AF_ALG + authencesn Page-Cache Write)
参照情報
CVE: CVE-2021-47101, CVE-2022-50410, CVE-2022-50422, CVE-2022-50673, CVE-2023-53259, CVE-2024-35965, CVE-2024-35966, CVE-2024-35967, CVE-2025-22022, CVE-2025-38102, CVE-2025-38565, CVE-2025-38685, CVE-2026-23060, CVE-2026-23204, CVE-2026-31431, CVE-2026-43077
CLSA: 2026:1777614769