{"id":"CVE-2026-68175","state":"PUBLISHED","title":"tracing: Fix resource leak on mmiotrace trace_pipe close","description":"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.","publishedAt":"2026-08-10T11:59:45.965Z","updatedAt":"2026-08-19T16:30:39.826Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"7871128ea41217fa6a58bbbcb44cb0d2e9e60966","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"1d0b59e2b203c02149d8f63607329debe36b3ec5","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"581ac13e12e77d6c64f8719083bdf95209308919","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"f9e6dfe341fb31c95b9655eb6b1db8b3ae090817","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"594e1cf3f736779a535873fd5988162d827bfe4f","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"cf5a82bef623b969a609f2b7e392d06dbae34aa6","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"cb459fec4f7b13caf646101ff076e94ef38434d8","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"c1d87e724ae55e781b7cc7ccafb34d9e668582b2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]}],"references":["https://git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966","https://git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5","https://git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919","https://git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817","https://git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f","https://git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6","https://git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8","https://git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68175.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68175","state":"PUBLISHED","datePublished":"2026-08-10T11:59:45.965Z","dateUpdated":"2026-08-19T16:30:39.826Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.372Z"},"containers":{"cna":{"title":"tracing: Fix resource leak on mmiotrace trace_pipe close","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"7871128ea41217fa6a58bbbcb44cb0d2e9e60966","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"1d0b59e2b203c02149d8f63607329debe36b3ec5","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"581ac13e12e77d6c64f8719083bdf95209308919","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"f9e6dfe341fb31c95b9655eb6b1db8b3ae090817","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"594e1cf3f736779a535873fd5988162d827bfe4f","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"cf5a82bef623b969a609f2b7e392d06dbae34aa6","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"cb459fec4f7b13caf646101ff076e94ef38434d8","versionType":"git"},{"version":"c521efd1700a8c0f7ce26f011f5eaecca17fabfa","status":"affected","lessThan":"c1d87e724ae55e781b7cc7ccafb34d9e668582b2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966"},{"url":"https://git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5"},{"url":"https://git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919"},{"url":"https://git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817"},{"url":"https://git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f"},{"url":"https://git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6"},{"url":"https://git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8"},{"url":"https://git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:30:39.826Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}