CVE-2025-37885 (GCVE-0-2025-37885)

Vulnerability from cvelistv5 – Published: 2025-05-09 06:45 – Updated: 2025-11-03 19:56
VLAI?
Title
KVM: x86: Reset IRTE to host control if *new* route isn't postable
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Reset IRTE to host control if *new* route isn't postable Restore an IRTE back to host control (remapped or posted MSI mode) if the *new* GSI route prevents posting the IRQ directly to a vCPU, regardless of the GSI routing type. Updating the IRTE if and only if the new GSI is an MSI results in KVM leaving an IRTE posting to a vCPU. The dangling IRTE can result in interrupts being incorrectly delivered to the guest, and in the worst case scenario can result in use-after-free, e.g. if the VM is torn down, but the underlying host IRQ isn't freed.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: efc644048ecde54f016011fe10110addd0de348f , < e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769 (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < 116c7d35b8f72eac383b9fd371d7c1a8ffc2968b (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < 023816bd5fa46fab94d1e7917fe131b79ed1fb41 (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < 3481fd96d801715942b6f69fe251133128156f30 (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < b5de7ac74f69603ad803c524b840bffd36368fc3 (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < 3066ec21d1a33896125747f68638725f456308db (git)
Affected: efc644048ecde54f016011fe10110addd0de348f , < 9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2 (git)
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    Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.136 , ≤ 6.1.* (semver)
Unaffected: 6.6.89 , ≤ 6.6.* (semver)
Unaffected: 6.12.26 , ≤ 6.12.* (semver)
Unaffected: 6.14.5 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Reset IRTE to host control if *new* route isn\u0027t postable\n\nRestore an IRTE back to host control (remapped or posted MSI mode) if the\n*new* GSI route prevents posting the IRQ directly to a vCPU, regardless of\nthe GSI routing type.  Updating the IRTE if and only if the new GSI is an\nMSI results in KVM leaving an IRTE posting to a vCPU.\n\nThe dangling IRTE can result in interrupts being incorrectly delivered to\nthe guest, and in the worst case scenario can result in use-after-free,\ne.g. if the VM is torn down, but the underlying host IRQ isn\u0027t freed."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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