vfio/pci: Create persistent INTx handler

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Summary

CVECVE-2024-26812
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-05 09:15:09 UTC
Updated2026-05-12 12:16:20 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 b18fa894d615c8527e15d96b76c7448800e13899 git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 27d40bf72dd9a6600b76ad05859176ea9a1b4897 git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 4cb0d7532126d23145329826c38054b4e9a05e7c git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 7d29d4c72c1e196cce6969c98072a272d1a703b3 git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 69276a555c740acfbff13fb5769ee9c92e1c828e git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 4c089cefe30924fbe20dd1ee92774ea1f5eca834 git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 0e09cf81959d9f12b75ad5c6dd53d237432ed034 git Not specified
CNA Linux Linux affected 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 18c198c96a815c962adc2b9b77909eec0be7df4d git Not specified
CNA Linux Linux affected 3.6 Not specified
CNA Linux Linux unaffected 3.6 semver Not specified
CNA Linux Linux unaffected 5.4.274 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.215 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.154 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.84 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.24 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.12 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8.3 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0e09cf81959d9f12b75ad5c6dd53d237432ed034 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/4cb0d7532126d23145329826c38054b4e9a05e7c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
git.kernel.org/stable/c/4c089cefe30924fbe20dd1ee92774ea1f5eca834 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/b18fa894d615c8527e15d96b76c7448800e13899 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/18c198c96a815c962adc2b9b77909eec0be7df4d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/7d29d4c72c1e196cce6969c98072a272d1a703b3 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/27d40bf72dd9a6600b76ad05859176ea9a1b4897 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/69276a555c740acfbff13fb5769ee9c92e1c828e af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 6000567 Debian Security Update for linux (DSA 5658-1)
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