s390/cpum_sf: Handle CPU hotplug remove during sampling 漏洞信息(CVE-2024-57849)

一、漏洞 CVE-2024-57849 基础信息

漏洞标题

s390/cpum_sf：在采样时处理CPU热插拔移除问题

来源：AIGC 神龙大模型

漏洞描述信息

N/A

来源：AIGC 神龙大模型

CVSS信息

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

来源：AIGC 神龙大模型

漏洞类别

使用共享资源的并发执行不恰当同步问题(竞争条件)

来源：AIGC 神龙大模型

漏洞标题

s390/cpum_sf: Handle CPU hotplug remove during sampling

来源：美国国家漏洞数据库 NVD

漏洞描述信息

In the Linux kernel, the following vulnerability has been resolved: s390/cpum_sf: Handle CPU hotplug remove during sampling CPU hotplug remove handling triggers the following function call sequence: CPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu() ... CPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu() The s390 CPUMF sampling CPU hotplug handler invokes: s390_pmu_sf_offline_cpu() +--> cpusf_pmu_setup() +--> setup_pmc_cpu() +--> deallocate_buffers() This function de-allocates all sampling data buffers (SDBs) allocated for that CPU at event initialization. It also clears the PMU_F_RESERVED bit. The CPU is gone and can not be sampled. With the event still being active on the removed CPU, the CPU event hotplug support in kernel performance subsystem triggers the following function calls on the removed CPU: perf_event_exit_cpu() +--> perf_event_exit_cpu_context() +--> __perf_event_exit_context() +--> __perf_remove_from_context() +--> event_sched_out() +--> cpumsf_pmu_del() +--> cpumsf_pmu_stop() +--> hw_perf_event_update() to stop and remove the event. During removal of the event, the sampling device driver tries to read out the remaining samples from the sample data buffers (SDBs). But they have already been freed (and may have been re-assigned). This may lead to a use after free situation in which case the samples are most likely invalid. In the best case the memory has not been reassigned and still contains valid data. Remedy this situation and check if the CPU is still in reserved state (bit PMU_F_RESERVED set). In this case the SDBs have not been released an contain valid data. This is always the case when the event is removed (and no CPU hotplug off occured). If the PMU_F_RESERVED bit is not set, the SDB buffers are gone.

来源：美国国家漏洞数据库 NVD

CVSS信息

N/A

来源：美国国家漏洞数据库 NVD

漏洞类别

N/A

来源：美国国家漏洞数据库 NVD

漏洞标题

Linux kernel 安全漏洞

来源：中国国家信息安全漏洞库 CNNVD

漏洞描述信息

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于CPU热插拔移除处理过程中，采样数据缓冲区（SDBs）可能被提前释放，导致释放后重用问题。

来源：中国国家信息安全漏洞库 CNNVD

CVSS信息

N/A

来源：中国国家信息安全漏洞库 CNNVD

漏洞类别

其他

来源：中国国家信息安全漏洞库 CNNVD

二、漏洞 CVE-2024-57849 的公开POC

#	POC 描述	源链接	神龙链接

三、漏洞 CVE-2024-57849 的情报信息

标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
标题： s390/cpum_sf: Handle CPU hotplug remove during sampling - kernel/git/stable/linux.git - Linux kernel stable tree -- 🔗来源链接

标签：
https://nvd.nist.gov/vuln/detail/CVE-2024-57849