tracing: Fix resource leak on mmiotrace trace_pipe close
Summary
| CVE | CVE-2026-68175 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 13:20:04 UTC |
| Updated | 2026-08-19 17:20:33 UTC |
| 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. |
Risk And Classification
EPSS: 0.002000000 probability, percentile 0.101960000 (date 2026-08-19)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa 7871128ea41217fa6a58bbbcb44cb0d2e9e60966 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa 1d0b59e2b203c02149d8f63607329debe36b3ec5 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa 581ac13e12e77d6c64f8719083bdf95209308919 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa f9e6dfe341fb31c95b9655eb6b1db8b3ae090817 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa 594e1cf3f736779a535873fd5988162d827bfe4f git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa cf5a82bef623b969a609f2b7e392d06dbae34aa6 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa cb459fec4f7b13caf646101ff076e94ef38434d8 git | Not specified |
| CNA | Linux | Linux | affected c521efd1700a8c0f7ce26f011f5eaecca17fabfa c1d87e724ae55e781b7cc7ccafb34d9e668582b2 git | Not specified |
| CNA | Linux | Linux | affected 2.6.33 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.33 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.265 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.216 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.183 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.