# CVE-2026-68175: tracing: Fix resource leak on mmiotrace trace_pipe close

CVE-2026-68175 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-68175, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-68175
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 10, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68175

## Description

In the Linux kernel, the following vulnerability has been resolved:  tracing: Fix resource leak on mmiotrace trace_pipe close  The mmiotrace tracer was added May 12th 2008. At that time, resources created in pipe_open() could not be freed because there was not pipe_close function pointer of the tracer. The pipe_close function pointer was added in December 7th, 2009, but the mmiotrace tracer was not updated.  mmio_pipe_open() allocates a header_iter and takes a pci_dev reference when trace_pipe is opened. mmio_close() frees them, but it was only wired to the tracer's .close callback.  tracing_release_pipe() invokes .pipe_close, not .close, when the trace_pipe file is released. As a result, closing trace_pipe with the mmiotrace tracer active leaked the header_iter allocation and left a stale pci_dev reference.  Set .pipe_close to mmio_close, matching how function_graph wires both callbacks to the same handler.  Note, if the trace_pipe is read to completion, it will clean up the resources, but if one were to run:    # head -n 1 /sys/kernel/tracing/trace_pipe  VERSION 20070824  Over and over again, it would trigger a massive leak.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.187-1 | [DEBIAN-CVE-2026-68175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68175.md) | Aug 11, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.101-1 | [DEBIAN-CVE-2026-68175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68175.md) | Aug 11, 2026 |
| Linux | linux Debian 14 | 7.1.6-1 | [DEBIAN-CVE-2026-68175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68175.md) | Aug 11, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.101-1~deb12u1 | [DEBIAN-CVE-2026-68175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68175.md) | Aug 11, 2026 |

---

Data as of 2026-11-08T13:06:02Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.