Описание
In the Linux kernel, the following vulnerability has been resolved:
io_uring/poll: avoid retry wakeup loss when dropping ownership
If a wakeup sets IO_POLL_RETRY_FLAG between the owning task consuming the existing instance of IO_POLL_RETRY_FLAG and the loop check of io_poll_check_events(), then we stall on processing the request until an unrelated wakeup comes along.
Using atomic_cmpxchg instead of atomic_sub_return to guarantee both the count v and poll_refs are 0 and no wake-ups are missed.
In the Linux kernel, the following vulnerability has been resolved:
io_uring/poll: avoid retry wakeup loss when dropping ownership
If a wakeup sets IO_POLL_RETRY_FLAG between the owning task consuming the existing instance of IO_POLL_RETRY_FLAG and the loop check of io_poll_check_events(), then we stall on processing the request until an unrelated wakeup comes along.
Using atomic_cmpxchg instead of atomic_sub_return to guarantee both the count v and poll_refs are 0 and no wake-ups are missed.
Ссылки
- https://nvd.nist.gov/vuln/detail/CVE-2026-99263
- https://git.kernel.org/stable/c/41fae2e9e1fa3bee86aee0a25ba90e59ce5024bf
- https://git.kernel.org/stable/c/4ef685b8505615729d75c875f52822238bf76ca6
- https://git.kernel.org/stable/c/521e8a65e9b45532295ba1082ef12be6e80c173b
- https://git.kernel.org/stable/c/937d38dcacd675dc0572d6c9b6743960df3128ed
- https://git.kernel.org/stable/c/afa407c02f3aa0fd872f86c9bf1b34502e0fa8f0
- https://git.kernel.org/stable/c/d1f6850086ac6f8b0fa44fb19aa2a468c73ee071
- https://git.kernel.org/stable/c/eb2a50d8235e4580fea9aa20f3fbe1a002c38cb1
CVE ID
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: avoid retry wakeup loss when dropping ownership If a wakeup sets IO_POLL_RETRY_FLAG between the owning task consuming the existing instance of IO_POLL_RETRY_FLAG and the loop check of io_poll_check_events(), then we stall on processing the request until an unrelated wakeup comes along. Using atomic_cmpxchg instead of atomic_sub_return to guarantee both the count v and poll_refs are 0 and no wake-ups are missed.
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
io_uring/poll: avoid retry wakeup loss when dropping ownership