一、漏洞信息
漏洞编号：CVE-2024-26812
漏洞归属组件：kernel
漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0
CVSS V2.0分值：
BaseScore：0.0 Low
Vector：CVSS：2.0/
漏洞简述：
In the Linux kernel, the following vulnerability has been resolved:vfio/pci: Create persistent INTx handlerA vulnerability exists where the eventfd for INTx signaling can bedeconfigured, which unregisters the IRQ handler but still allowseventfds to be signaled with a NULL context through the SET_IRQS ioctlor through unmask irqfd if the device interrupt is pending.Ideally this could be solved with some additional locking; the igatemutex serializes the ioctl and config space accesses, and the interrupthandler is unregistered relative to the trigger, but the irqfd pathruns asynchronous to those. The igate mutex cannot be acquired from theatomic context of the eventfd wake function. Disabling the irqfdrelative to the eventfd registration is potentially incompatible withexisting userspace.As a result, the solution implemented here moves configuration of theINTx interrupt handler to track the lifetime of the INTx context objectand irq_type configuration, rather than registration of a particulartrigger eventfd. Synchronization is added between the ioctl path andeventfd_signal() wrapper such that the eventfd trigger can bedynamically updated relative to in-flight interrupts or irqfd callbacks.
漏洞公开时间：2024-04-05 17:15:09
漏洞创建时间：2024-04-05 17:44:45
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2024-26812

漏洞分析指导链接：
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
漏洞数据来源:
openBrain开源漏洞感知系统
漏洞补丁信息：

二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:vfio/pci: Create persistent INTx handlerA vulnerability exists where the eventfd for INTx signaling can bedeconfigured, which unregisters the IRQ handler but still allowseventfds to be signaled with a NULL context through the SET_IRQS ioctlor through unmask irqfd if the device interrupt is pending.Ideally this could be solved with some additional locking; the igatemutex serializes the ioctl and config space accesses, and the interrupthandler is unregistered relative to the trigger, but the irqfd pathruns asynchronous to those. The igate mutex cannot be acquired from theatomic context of the eventfd wake function. Disabling the irqfdrelative to the eventfd registration is potentially incompatible withexisting userspace.As a result, the solution implemented here moves configuration of theINTx interrupt handler to track the lifetime of the INTx context objectand irq_type configuration, rather than registration of a particulartrigger eventfd. Synchronization is added between the ioctl path andeventfd_signal() wrapper such that the eventfd trigger can bedynamically updated relative to in-flight interrupts or irqfd callbacks.
openEuler评分：
4.4
Vector：CVSS：2.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
受影响版本排查(受影响/不受影响)：
1.openEuler-20.03-LTS-SP1(4.19.90):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):受影响
3.openEuler-22.03-LTS(5.10.0):受影响
4.openEuler-22.03-LTS-SP1(5.10.0):受影响
5.openEuler-22.03-LTS-SP2(5.10.0):受影响
6.openEuler-22.03-LTS-SP3(5.10.0):受影响
7.master(6.1.0):不受影响
8.openEuler-22.03-LTS-Next(5.10.0):不受影响
9.openEuler-24.03-LTS:不受影响
10.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS(5.10.0):否
4.openEuler-22.03-LTS-SP1(5.10.0):否
5.openEuler-22.03-LTS-SP2(5.10.0):否
6.openEuler-22.03-LTS-SP3(5.10.0):否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next(5.10.0):否
9.openEuler-24.03-LTS:否
10.openEuler-24.03-LTS-Next:否