GHSA-JCVR-9JRW-GR2R
Vulnerability from github – Published: 2026-11-03 12:31 – Updated: 2026-11-03 21:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-99263"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-11-03T12:17:33Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: avoid retry wakeup loss when dropping ownership\n\nIf a wakeup sets IO_POLL_RETRY_FLAG between the owning task consuming\nthe existing instance of IO_POLL_RETRY_FLAG and the loop check\nof io_poll_check_events(), then we stall on processing the request\nuntil an unrelated wakeup comes along.\n\nUsing atomic_cmpxchg instead of atomic_sub_return to guarantee both the\ncount v and poll_refs are 0 and no wake-ups are missed.",
"id": "GHSA-jcvr-9jrw-gr2r",
"modified": "2026-11-03T21:32:06Z",
"published": "2026-11-03T12:31:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99263"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/41fae2e9e1fa3bee86aee0a25ba90e59ce5024bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ef685b8505615729d75c875f52822238bf76ca6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/521e8a65e9b45532295ba1082ef12be6e80c173b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/937d38dcacd675dc0572d6c9b6743960df3128ed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/afa407c02f3aa0fd872f86c9bf1b34502e0fa8f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1f6850086ac6f8b0fa44fb19aa2a468c73ee071"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb2a50d8235e4580fea9aa20f3fbe1a002c38cb1"
}
],
"schema_version": "1.4.0",
"severity": []
}
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