CVE-2026-80896 is a vulnerability in Linux Kernel
Published on September 4, 2026
mshv: Fix race in mshv_irqfd_deassign
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.
Products Associated with CVE-2026-80896
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Affected Versions
Linux:- Version 621191d709b14882270dfd8ea5d7d6cdfebe2c35 and below 72a90ce4918b5a2d4820fe20677ba9af780d8826 is affected.
- Version 621191d709b14882270dfd8ea5d7d6cdfebe2c35 and below 4529a41a675b96e0f876eef1cc93a31a57cb4d18 is affected.
- Version 621191d709b14882270dfd8ea5d7d6cdfebe2c35 and below 0762262ac3e70f65b3bb843fe892f8bac1562d08 is affected.
- Version 6.15 is affected.
- Before 6.15 is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.