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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-40160

xen/events: Return -EEXIST for bound VIRQs

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: xen/events: Return -EEXIST for bound VIRQs Change find_virq() to return -EEXIST when a VIRQ is bound to a different CPU than the one passed in. With that, remove the BUG_ON() from bind_virq_to_irq() to propogate the error upwards. Some VIRQs are per-cpu, but others are per-domain or global. Those must be bound to CPU0 and can then migrate elsewhere. The lookup for per-domain and global will probably fail when migrated off CPU 0, especially when the current CPU is tracked. This now returns -EEXIST instead of BUG_ON(). A second call to bind a per-domain or global VIRQ is not expected, but make it non-fatal to avoid trying to look up the irq, since we don't know which per_cpu(virq_to_irq) it will be in.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 62cc5fc7b2e0218144e162afb8191db9b924b5e6 to < 7e19b3643855d4b63442bd20e8bb811e1a75998eaffected
  • 62cc5fc7b2e0218144e162afb8191db9b924b5e6 to < 612ef6056855c0aacb9b25d1d853c435754483f7affected
  • 62cc5fc7b2e0218144e162afb8191db9b924b5e6 to < a1e7f07ae6b594f1ba5be46c6125b43bc505c5aaaffected
  • 62cc5fc7b2e0218144e162afb8191db9b924b5e6 to < f81db055a793eca9d05f79658ff62adafb41d664affected
  • 62cc5fc7b2e0218144e162afb8191db9b924b5e6 to < 07ce121d93a5e5fb2440a24da3dbf408fcee978eaffected

Linux Linux

Default version status: affected

  • 3.2affected
  • 0 to < 3.2unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.113 to ≤ 6.6.*unaffected
  • 6.12.54 to ≤ 6.12.*unaffected
  • 6.17.4 to ≤ 6.17.*unaffected
  • 6.18 to ≤ *unaffected

References