Description
In the Linux kernel, the following vulnerability has been resolved:
mshv: Fix race in mshv_irqfd_deassign
mshv_irqfd_deactivate() and the hlist traversal of pt_irqfds_list require pt->pt_irqfds_lock to be held, but mshv_irqfd_deassign() omits it. This races with the EPOLLHUP path in mshv_irqfd_wakeup(), which does take the lock before calling mshv_irqfd_deactivate().
Additionally, mshv_irqfd_deactivate() uses hlist_del() which poisons the node pointers rather than resetting them. Since mshv_irqfd_is_active() relies on hlist_unhashed() (checks pprev == NULL), a poisoned node still appears active. If a concurrent path calls mshv_irqfd_deactivate() again on the same irqfd, the guard fails to prevent a double hlist_del() on poisoned pointers.
Fix both issues: - Add the missing spin_lock_irq/spin_unlock_irq around the list traversal in mshv_irqfd_deassign(), matching mshv_irqfd_release(). - Use hlist_del_init() instead of hlist_del() so the node is properly marked as unhashed after removal, making the is_active guard reliable.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 621191d709b14882270dfd8ea5d7d6cdfebe2c35, < 72a90ce4918b5a2d4820fe20677ba9af780d8826; >= 621191d709b14882270dfd8ea5d7d6cdfebe2c35, < 4529a41a675b96e0f876eef1cc93a31a57cb4d18; >= 621191d709b14882270dfd8ea5d7d6cdfebe2c35, < 0762262ac3e70f65b3bb843fe892f8bac1562d08 |
| Linux | Linux | 6.15 |
References
Timeline
- Published
- Sep 4, 2026
- Last modified
- Sep 4, 2026
- NVD status
- Received