CVE-2026-80896: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 621191d709b14882270dfd8ea5d7d6cdfebe2c35 преди 72a90ce4918b5a2d4820fe20677ba9af780d8826; 621191d709b14882270dfd8ea5d7d6cdfebe2c35 преди 4529a41a675b96e0f876eef1cc93a31a57cb4d18; 621191d709b14882270dfd8ea5d7d6cdfebe2c35 преди 0762262ac3e70f65b3bb843fe892f8bac1562d08
• Linux Linux: 6.15; преди 6.15; 6.18.44 до 6.18.*; 7.1.8 до 7.1.*; от 7.2 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-80896
• https://nvd.nist.gov/vuln/detail/CVE-2026-80896
• https://git.kernel.org/stable/c/72a90ce4918b5a2d4820fe20677ba9af780d8826
• https://git.kernel.org/stable/c/4529a41a675b96e0f876eef1cc93a31a57cb4d18
• https://git.kernel.org/stable/c/0762262ac3e70f65b3bb843fe892f8bac1562d08