CVE-2026-99263
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CVE-2026-99263
Summary: io_uring/poll: avoid retry wakeup loss when dropping ownership
Details: 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.
References: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git, 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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99263.json, https://nvd.nist.gov/vuln/detail/CVE-2026-99263
Affected packages
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Type: GIT
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