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CVE-2024-26812— vfio/pci: Create persistent INTx handler

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 vfio/pci 中存在安全问题。

CVSS 7.8 · High EPSS 0.25% · P15

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< b18fa894d615c8527e15d96b76c7448800e13899 affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 27d40bf72dd9a6600b76ad05859176ea9a1b4897 affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 4cb0d7532126d23145329826c38054b4e9a05e7c affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 7d29d4c72c1e196cce6969c98072a272d1a703b3 affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 69276a555c740acfbff13fb5769ee9c92e1c828e affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 4c089cefe30924fbe20dd1ee92774ea1f5eca834 affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 0e09cf81959d9f12b75ad5c6dd53d237432ed034 affected
89e1f7d4c66d85f42c3d52ea3866eb10cadf6153< 18c198c96a815c962adc2b9b77909eec0be7df4d affected
… +10 more rows
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I. Basic Information for CVE-2024-26812

Vulnerability Information
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Vulnerability Title
vfio/pci: Create persistent INTx handler
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Create persistent INTx handler A vulnerability exists where the eventfd for INTx signaling can be deconfigured, which unregisters the IRQ handler but still allows eventfds to be signaled with a NULL context through the SET_IRQS ioctl or through unmask irqfd if the device interrupt is pending. Ideally this could be solved with some additional locking; the igate mutex serializes the ioctl and config space accesses, and the interrupt handler is unregistered relative to the trigger, but the irqfd path runs asynchronous to those. The igate mutex cannot be acquired from the atomic context of the eventfd wake function. Disabling the irqfd relative to the eventfd registration is potentially incompatible with existing userspace. As a result, the solution implemented here moves configuration of the INTx interrupt handler to track the lifetime of the INTx context object and irq_type configuration, rather than registration of a particular trigger eventfd. Synchronization is added between the ioctl path and eventfd_signal() wrapper such that the eventfd trigger can be dynamically updated relative to in-flight interrupts or irqfd callbacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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 vfio/pci 中存在安全问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 ~ b18fa894d615c8527e15d96b76c7448800e13899 -
Linux Linux 3.6 -

II. Public POCs for CVE-2024-26812

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III. Intelligence Information for CVE-2024-26812

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Mailing List Discussions for CVE-2024-26812 (1)

Other References for CVE-2024-26812 (8)

Same Patch Batch · Linux · 2024-04-05 · 5 CVEs total

CVE-2024-26810 7.8 HIGH vfio/pci: Lock external INTx masking ops
CVE-2024-27437 vfio/pci: Disable auto-enable of exclusive INTx IRQ
CVE-2024-26814 vfio/fsl-mc: Block calling interrupt handler without trigger
CVE-2024-26813 vfio/platform: Create persistent IRQ handlers

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26812

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