# CVE-2026-74392: linux: In the Linux kernel, the following vulnerability has been resolved:  dm: limit target bio polling to one shot  dm_pol...

CVE-2026-74392 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74392 (version 7.1.5-1), released August 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-74392
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  dm: limit target bio polling to one shot  dm_poll_bio() is the ->poll_bio() callback for a stacked dm device. The caller only knows about the dm queue, so it may decide to do a spinning poll if it thinks a single queue is being polled. Passing those flags unchanged to the mapped clone lets blk_mq_poll() spin on a target queue from inside dm_poll_bio().  With io_uring IOPOLL on a dm-stripe target this can keep a task in    dm_poll_bio() -> bio_poll() -> blk_mq_poll()  long enough to trigger an RCU CPU stall, before io_uring gets back to io_iopoll_check() and its need_resched() check.  Keep dm's ->poll_bio() bounded by forcing one-shot polling for target bios. The caller can invoke dm_poll_bio() again if it wants to keep polling, and it also gets a chance to reap completions or reschedule between passes.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-74392](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74392.md) | Aug 15, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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