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AlmaLinux 9.2 [TuxCare] 安全更新：bpftool / kernel / kernel-abi-stablelists / kernel-core / 等多个漏洞 （ALMALINUX9.2：CLSA-2026：1778896895）

high Nessus 插件 ID 360237

语言：

简介

AlmaLinux 主机缺少一个或多个安全更新。

描述

AlmaLinux 9.2 主机上存在安装的程序包，该程序包受到 TuxCare ALMALINUX9.2：CLSA-2026：2026：1778896895公告中提及的多个漏洞的影响。

 - 已修复 Linux 内核中的下列漏洞：can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor.
 can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually] (CVE-2026-31532)

 - 已修复 Linux 内核中的下列漏洞：ptrace: slightly saner 'get_dumpable()' logic The 'dumpability' of a task is fundamentally about the memory image of the task - the concept comes from whether it can core dump or not - and makes no sense when you don't have an associated mm. And almost all users do in fact use it only for the case where the task has a mm pointer.
 But we have one odd special case: ptrace_may_access() uses 'dumpable' to check various other things entirely independently of the MM (typically explicitly using flags like PTRACE_MODE_READ_FSCREDS).
 Including for threads that no longer have a VM (and maybe never did, like most kernel threads). It's not what this flag was designed for, but it is what it is. The ptrace code does check that the uid/gid matches, so you do have to be uid-0 to see kernel thread details, but this means that the traditional drop capabilities model doesn't make any difference for this all. Make it all make a *bit* more sense by saying that if you don't have a MM pointer, we'll use a cached last dumpability flag if the thread ever had a MM (it will be zero for kernel threads since it is never set), and require a proper CAP_SYS_PTRACE capability to override. (CVE-2026-46333)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

解决方案

根据 TuxCare 公告 ALMALINUX9.2：CLSA-2026：1778896895 中的指南更新受影响的程序包。

另见

https://cve.tuxcare.com/els/releases/CLSA-2026:1778896895

http://www.nessus.org/u?cfbafb64

插件详情

严重性: High

ID: 360237

文件名: tuxcare_alma_linux_9.2_CLSA-2026-1778896895.nasl

版本: 1.1

类型: Local

发布时间: 2026/10/1

最近更新时间: 2026/10/1

支持的传感器: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

风险信息

VPR

风险因素: High

分数: 8.9

百分位: 99.71

Vendor

Vendor Severity: Important

CVSS v2

风险因素: Medium

基本分数: 6.8

时间分数: 5.3

矢量: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS 分数来源: CVE-2026-31532

CVSS v3

风险因素: High

基本分数: 7.8

时间分数: 7

矢量: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

时间矢量: CVSS:3.0/E:P/RL:O/RC:C

漏洞信息

必需的 KB 项: Host/OS/extended-third-party, Host/local_checks_enabled, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu

可利用: true

易利用性: Exploits are available

补丁发布日期: 2026/5/16

漏洞发布日期: 2026/4/23

参考资料信息

CVE: CVE-2026-31532, CVE-2026-46333

CLSA: 2026:1778896895