{"id":"CVE-2026-68175","summary":"tracing: Fix resource leak on mmiotrace trace_pipe close","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix resource leak on mmiotrace trace_pipe close\n\nThe mmiotrace tracer was added May 12th 2008. At that time, resources\ncreated in pipe_open() could not be freed because there was not\npipe_close function pointer of the tracer. The pipe_close function pointer\nwas added in December 7th, 2009, but the mmiotrace tracer was not updated.\n\nmmio_pipe_open() allocates a header_iter and takes a pci_dev reference\nwhen trace_pipe is opened. mmio_close() frees them, but it was only\nwired to the tracer's .close callback.\n\ntracing_release_pipe() invokes .pipe_close, not .close, when the\ntrace_pipe file is released. As a result, closing trace_pipe with the\nmmiotrace tracer active leaked the header_iter allocation and left a\nstale pci_dev reference.\n\nSet .pipe_close to mmio_close, matching how function_graph wires both\ncallbacks to the same handler.\n\nNote, if the trace_pipe is read to completion, it will clean up the\nresources, but if one were to run:\n\n  # head -n 1 /sys/kernel/tracing/trace_pipe\n VERSION 20070824\n\nOver and over again, it would trigger a massive leak.","modified":"2026-08-18T03:31:24.386250651Z","published":"2026-08-10T11:59:45.965Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68175.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68175.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68175"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa"},{"fixed":"f9e6dfe341fb31c95b9655eb6b1db8b3ae090817"},{"fixed":"594e1cf3f736779a535873fd5988162d827bfe4f"},{"fixed":"cf5a82bef623b969a609f2b7e392d06dbae34aa6"},{"fixed":"cb459fec4f7b13caf646101ff076e94ef38434d8"},{"fixed":"c1d87e724ae55e781b7cc7ccafb34d9e668582b2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68175.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.33"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68175.json"}}],"schema_version":"1.9.0"}