CentOS Linux 7 [TuxCare] 安全性更新:bpftool / kernel / kernel-debug / kernel-debug-devel / kernel-devel / etc 多個弱點 (CENTOS7:CLSA-2026:1787291758)

high Nessus Plugin ID 360159

概要

CentOS Linux 主機缺少一個或多個安全性更新。

說明

CentOS Linux 7 主機已安裝的套件會受到 TuxCare CENTOS7:CLSA-2026:1787291758 公告中提及的多個弱點影響。

- 當已知來源暫存器為 0 時,Linux 核心中的 bpf 驗證器未正確處理 mod32 目的地暫存器截斷。能夠載入 bpf 程式的本機攻擊者可利用此問題,取得核心記憶體中的超出邊界讀取權限,進而導致資訊洩漏 (核心記憶體),並且可能造成超出邊界寫入,進而導致程式碼執行。此問題已在上游核心的提交 9b00f1b78809 (bpf: 修正 mod32 dst reg wrt zero) 的截斷處理) 和 Linux 穩定核心 5.11.2、 5.10.195.4.101和 中得到解決。(CVE-2021-3444)

- 已解決 Linux 核心中的下列弱點:sctp: don't free the ASCONF's own transport in DEL-IP processing sctp_process_asconf() caches the transport the ASCONF chunk is processed against in asconf->transport (== chunk->transport, set once in sctp_rcv()). For an ASCONF located through its Address Parameter by __sctp_rcv_asconf_lookup(), that cached transport corresponds to the Address Parameter, which need not be the packet's source address. sctp_process_asconf_param() rejects a DEL-IP for the packet source address (ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport. A single ASCONF can therefore carry, in order: [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0] where L differs from the source. The DEL-IP for L passes the D8 check and calls sctp_assoc_rm_peer() on the transport that asconf->transport still points at, freeing it (RCU-deferred). The following wildcard DEL-IP then reuses the now-dangling asconf->transport in sctp_assoc_set_primary() and sctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed transport (->ipaddr, ->state) and plants the dangling pointer into asoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping only the pointer that is no longer on the list, removes every real transport, leaving the association with a transport_count of 0 and primary_path/active_path pointing at freed memory. Reject a DEL-IP that targets the transport the ASCONF is being processed against, mirroring the existing source-address guard, so the wildcard branch can never reuse a freed transport. (CVE-2026-64564)

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 CENTOS7:CLSA-2026:1787291758 中的指引更新受影響的套件。

另請參閱

https://cve.tuxcare.com/els/releases/CLSA-2026:1787291758

http://www.nessus.org/u?38bbe121

Plugin 詳細資訊

嚴重性: High

ID: 360159

檔案名稱: tuxcare_centos_7_CLSA-2026-1787291758.nasl

版本: 1.2

類型: Local

代理程式: unix

已發布: 2026/10/1

已更新: 2026/10/2

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: 7.9

百分位數: 99.35

Vendor

Vendor Severity: Important

CVSS v2

風險因素: Medium

基本分數: 4.6

時間性分數: 3.6

媒介: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS 評分資料來源: CVE-2021-3444

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-2023-52760

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: 2026/8/21

弱點發布日期: 2021/3/23

參考資訊

CVE: CVE-2021-3444, CVE-2023-52760, CVE-2026-64564

CLSA: 2026:1787291758