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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
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No data available yet.
No solution or workaround provided in the CVE record.
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Tracking
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Tue, 03 Nov 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-362 |
Tue, 03 Nov 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | io_uring/poll: avoid retry wakeup loss when dropping ownership | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-11-03T11:48:15.743Z
Reserved: 2026-09-25T10:25:14.404Z
Link: CVE-2026-99263
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-03T12:17:33.347
Modified: 2026-11-03T12:17:33.347
Link: CVE-2026-99263
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-11-03T14:00:19Z
-
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')