CVE-2026-99263
io_uring/poll: avoid retry wakeup loss when dropping ownership
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Nov 3, 2026 |
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Affected Versions
Linux / Linux
a26a35e9019fd70bf3cf647dcfdae87abc7bacea < d1f6850086ac6f8b0fa44fb19aa2a468c73ee071 a26a35e9019fd70bf3cf647dcfdae87abc7bacea < 41fae2e9e1fa3bee86aee0a25ba90e59ce5024bf a26a35e9019fd70bf3cf647dcfdae87abc7bacea < 4ef685b8505615729d75c875f52822238bf76ca6 a26a35e9019fd70bf3cf647dcfdae87abc7bacea < afa407c02f3aa0fd872f86c9bf1b34502e0fa8f0 a26a35e9019fd70bf3cf647dcfdae87abc7bacea < eb2a50d8235e4580fea9aa20f3fbe1a002c38cb1 a26a35e9019fd70bf3cf647dcfdae87abc7bacea < 521e8a65e9b45532295ba1082ef12be6e80c173b 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048 bc4e6ee16778149811333a969a7a893d4cc110c5 5.15.82 < 5.16 6.0.11 < 6.1
Linux / Linux
6.1
References
git.kernel.org: https://git.kernel.org/stable/c/d1f6850086ac6f8b0fa44fb19aa2a468c73ee071 git.kernel.org: https://git.kernel.org/stable/c/41fae2e9e1fa3bee86aee0a25ba90e59ce5024bf git.kernel.org: https://git.kernel.org/stable/c/4ef685b8505615729d75c875f52822238bf76ca6 git.kernel.org: https://git.kernel.org/stable/c/afa407c02f3aa0fd872f86c9bf1b34502e0fa8f0 git.kernel.org: https://git.kernel.org/stable/c/eb2a50d8235e4580fea9aa20f3fbe1a002c38cb1 git.kernel.org: https://git.kernel.org/stable/c/521e8a65e9b45532295ba1082ef12be6e80c173b