# CVE-2021-47569: linux: In the Linux kernel, the following vulnerability has been resolved:  io_uring: fail cancellation for EXITING tasks  W...

CVE-2021-47569 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47569, released May 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47569
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  io_uring: fail cancellation for EXITING tasks  WARNING: CPU: 1 PID: 20 at fs/io_uring.c:6269 io_try_cancel_userdata+0x3c5/0x640 fs/io_uring.c:6269 CPU: 1 PID: 20 Comm: kworker/1:0 Not tainted 5.16.0-rc1-syzkaller #0 Workqueue: events io_fallback_req_func RIP: 0010:io_try_cancel_userdata+0x3c5/0x640 fs/io_uring.c:6269 Call Trace:  <TASK>  io_req_task_link_timeout+0x6b/0x1e0 fs/io_uring.c:6886  io_fallback_req_func+0xf9/0x1ae fs/io_uring.c:1334  process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298  worker_thread+0x658/0x11f0 kernel/workqueue.c:2445  kthread+0x405/0x4f0 kernel/kthread.c:327  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295  </TASK>  We need original task's context to do cancellations, so if it's dying and the callback is executed in a fallback mode, fail the cancellation attempt.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47569](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47569.md) | May 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47569](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47569.md) | May 24, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47569](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47569.md) | May 24, 2024 |

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