CVE-2024-27437

low-risk
Published 2024-04-05

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Disable auto-enable of exclusive INTx IRQ Currently for devices requiring masking at the irqchip for INTx, ie. devices without DisINTx support, the IRQ is enabled in request_irq() and subsequently disabled as necessary to align with the masked status flag. This presents a window where the interrupt could fire between these events, resulting in the IRQ incrementing the disable depth twice. This would be unrecoverable for a user since the masked flag prevents nested enables through vfio. Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx is never auto-enabled, then unmask as required.

Do I need to act?

-
0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (2)

Affected Vendors

Debian Linux

References (17)

Patch https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060
Patch https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351
Patch https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2
Patch https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda
Patch https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5
Patch https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438
Patch https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec
Patch https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43
Patch https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060
Patch https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351
Patch https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2
Patch https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda
Patch https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5
Patch https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438
Patch https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec
Patch https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43
Mailing List https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
25
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 7/34 · Low