CentOS Linux 6 [TuxCare] 安全性更新:核心 / kernel-abi-whitelists / kernel-debug / kernel-debug-devel / etc 多個弱點 (CENTOS6:CLSA-2025:1762454401)

high Nessus Plugin ID 361913

概要

CentOS Linux 主機缺少一個或多個安全性更新。

說明

CentOS Linux 6 主機已安裝的套件會受到 TuxCare CENTOS6:CLSA-2025:1762454401 公告中提及的多個弱點影響。

- Linux PV 裝置前端容易受到後端攻擊 [其 CNA 資訊記錄與多個 CVE 有關;文字說明了哪些方面/弱點對應哪個 CVE。] 數個 Linux PV 裝置前端正在以易受爭用情形影響的方式,使用授權表介面移除後端的存取權,進而可能導致資料洩漏、惡意後端損毀資料以及惡意後端觸發拒絕服務:blkfront、netfront、scsifront 和 gntalloc 驅動程式正在測試授權參照是否仍在使用中。如果情況並非如此,則它們會假設後續每次都能移除授予的存取權;但如果後端已在執行這兩項作業之間對應授權頁面,則此假設不成立。因此,無論前端 I/O 完成後如何使用頁面,後端都可以繼續存取客體的記憶體頁面。
xenbus 驅動程式有一個類似的問題,因為它不會檢查是否成功移除向共用環形緩衝區授予的存取權。blkfront:CVE-2022-23036 netfront:CVE-2022-23037 scsifront:CVE-2022-23038 gntalloc:CVE-2022-23039 xenbus:CVE-2022-23040 blkfront、netfront、scsifront、usbfront、dmabuf、xenbus、9p、kbdfront 和 pvcalls 使用功能延遲釋放授權參照 (直到不再使用這個參照),但相關資料頁面的釋放與刪除授予的存取權並不同步。因此,即使在記憶體頁面被釋放並重新用於其他目的之後,後端仍可繼續存取該頁面。CVE-2022-23041 如果 netfront 無法撤銷 rx 路徑中的存取權,則 BUG_ON() 宣告將失敗。這會導致客體發生拒絕服務 (DoS) 情形,而此情形可能由後端觸發。CVE-2022-23042 (CVE-2022-23037)

- 已解決 Linux 核心中的下列弱點:ALSA: oss: Fix PCM OSS buffer allocation overflow We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given;
in the reported case, it went over INT_MAX, hence it hits WARN_ON(). This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes. This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated. In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes. (CVE-2022-49292)

- 已解決 Linux 核心中的下列弱點:net: atm: fix use after free in lec_send() The ->send() operation frees skb so save the length before calling ->send() to avoid a use after free. (CVE-2025-22004)

- 已解決 Linux 核心中的下列弱點:net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats. (CVE-2025-38477)

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 CENTOS6:CLSA-2025:1762454401 中的指引更新受影響的套件。

另請參閱

https://cve.tuxcare.com/els/releases/CLSA-2025:1762454401

http://www.nessus.org/u?30093bf9

Plugin 詳細資訊

嚴重性: High

ID: 361913

檔案名稱: tuxcare_centos_6_CLSA-2025-1762454401.nasl

版本: 1.1

類型: Local

代理程式: unix

已發布: 2026/10/1

已更新: 2026/10/1

支援的感應器: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

風險資訊

VPR

風險因素: Medium

分數: 4.9

百分位數: 57.12

Vendor

Vendor Severity: Important

CVSS v2

風險因素: Medium

基本分數: 4.4

時間性分數: 3.3

媒介: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS 評分資料來源: CVE-2022-23037

CVSS v3

風險因素: High

基本分數: 7.8

時間性分數: 6.8

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:U/RL:O/RC:C

CVSS 評分資料來源: CVE-2022-49292

弱點資訊

必要的 KB 項目: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list

可輕鬆利用: No known exploits are available

修補程式發佈日期: 2025/11/6

弱點發布日期: 2021/7/21

參考資訊

CVE: CVE-2022-23037, CVE-2022-48757, CVE-2022-49292, CVE-2025-22004, CVE-2025-38477

CLSA: 2025:1762454401