{"api_version":"1","generated_at":"2026-09-09T05:33:23+00:00","cve":"CVE-2026-80854","urls":{"html":"https://cve.report/CVE-2026-80854","api":"https://cve.report/api/cve/CVE-2026-80854.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80854","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80854"},"summary":{"title":"usb: gadget: f_tcm: keep port count until LUN teardown completes","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: keep port count until LUN teardown completes\n\ntcm_usbg_drop_nexus() permits session removal once tpg_port_count\nreaches zero. However, usbg_port_unlink() currently decrements that\ncount from the fabric_pre_unlink() callback, before core_dev_del_lun()\nwaits for active se_lun references to drain.\n\nIf removal of the last LUN races a nexus removal, the latter can observe\na zero port count and call target_remove_session(). This frees\nsess_cmd_map while an in-flight struct usbg_cmd, including its work item,\ncan still be accessed.\n\nOverlapping the last-LUN unlink with nexus removal reproduces this\nlifetime violation as a DEBUG_OBJECTS \"free active\" warning for\nusbg_cmd_work, followed by a target-core BUG/Oops.\n\nThe generic target-core unlink path has no callback after\ncore_dev_del_lun() completes. Add an optional fabric_post_unlink()\ncallback and use it for the f_tcm port count. The count now remains\nnonzero until core_dev_del_lun() has finished draining active LUN\nreferences, preventing nexus removal from freeing the session during\ncommand completion.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 16:18:14","updated_at":"2026-09-04 16:18:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780","name":"https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95","name":"https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4","name":"https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b","name":"https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b","name":"https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165","name":"https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9","name":"https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa","name":"https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929","name":"https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80854","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80854","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c52661d60f636d17e26ad834457db333bd1df494 c494c5562ca69b61a82f566e3b87a445d2c28929 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c52661d60f636d17e26ad834457db333bd1df494 c1f359d9a5efed458946063de65ddbeaacc4f165 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c52661d60f636d17e26ad834457db333bd1df494 178f59a0bccd3f66cdfa5184310f31a58b7257c4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c52661d60f636d17e26ad834457db333bd1df494 ad6f0375d2e93a1d8c015463e5e92dfcb26e311b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.269 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.220 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.187 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.156 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.108 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.49 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.13 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.3 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80854","cve":"CVE-2026-80854","epss":"0.001820000","percentile":"0.078380000","score_date":"2026-09-07","updated_at":"2026-09-08 00:05:27"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/target/target_core_fabric_configfs.c","drivers/usb/gadget/function/f_tcm.c","include/target/target_core_fabric.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c494c5562ca69b61a82f566e3b87a445d2c28929","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"c1f359d9a5efed458946063de65ddbeaacc4f165","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"178f59a0bccd3f66cdfa5184310f31a58b7257c4","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"ad6f0375d2e93a1d8c015463e5e92dfcb26e311b","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"2efbfd42441d3ef8137aff2d59e9835e1d5ae780","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"bbd6aa311a9f4dd17822c7557451458d3d2e980b","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"eaa96a8458f54d6cf0954242ab8b1df2a6fccafa","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"},{"lessThan":"c39d0916da47d94909391876c9e5bd429ea7b1b9","status":"affected","version":"c52661d60f636d17e26ad834457db333bd1df494","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/target/target_core_fabric_configfs.c","drivers/usb/gadget/function/f_tcm.c","include/target/target_core_fabric.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.269","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.220","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.187","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.156","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.108","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.49","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.13","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.269","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.220","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.187","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.156","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.108","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.49","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.13","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.3","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: keep port count until LUN teardown completes\n\ntcm_usbg_drop_nexus() permits session removal once tpg_port_count\nreaches zero. However, usbg_port_unlink() currently decrements that\ncount from the fabric_pre_unlink() callback, before core_dev_del_lun()\nwaits for active se_lun references to drain.\n\nIf removal of the last LUN races a nexus removal, the latter can observe\na zero port count and call target_remove_session(). This frees\nsess_cmd_map while an in-flight struct usbg_cmd, including its work item,\ncan still be accessed.\n\nOverlapping the last-LUN unlink with nexus removal reproduces this\nlifetime violation as a DEBUG_OBJECTS \"free active\" warning for\nusbg_cmd_work, followed by a target-core BUG/Oops.\n\nThe generic target-core unlink path has no callback after\ncore_dev_del_lun() completes. Add an optional fabric_post_unlink()\ncallback and use it for the f_tcm port count. The count now remains\nnonzero until core_dev_del_lun() has finished draining active LUN\nreferences, preventing nexus removal from freeing the session during\ncommand completion."}],"providerMetadata":{"dateUpdated":"2026-09-04T15:55:06.478Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929"},{"url":"https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165"},{"url":"https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4"},{"url":"https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b"},{"url":"https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780"},{"url":"https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95"},{"url":"https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b"},{"url":"https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa"},{"url":"https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9"}],"title":"usb: gadget: f_tcm: keep port count until LUN teardown completes","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80854","datePublished":"2026-09-04T15:55:06.478Z","dateReserved":"2026-08-26T14:34:25.797Z","dateUpdated":"2026-09-04T15:55:06.478Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 16:18:14","lastModifiedDate":"2026-09-04 16:18:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80854","Ordinal":"1","Title":"usb: gadget: f_tcm: keep port count until LUN teardown completes","CVE":"CVE-2026-80854","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80854","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: keep port count until LUN teardown completes\n\ntcm_usbg_drop_nexus() permits session removal once tpg_port_count\nreaches zero. However, usbg_port_unlink() currently decrements that\ncount from the fabric_pre_unlink() callback, before core_dev_del_lun()\nwaits for active se_lun references to drain.\n\nIf removal of the last LUN races a nexus removal, the latter can observe\na zero port count and call target_remove_session(). This frees\nsess_cmd_map while an in-flight struct usbg_cmd, including its work item,\ncan still be accessed.\n\nOverlapping the last-LUN unlink with nexus removal reproduces this\nlifetime violation as a DEBUG_OBJECTS \"free active\" warning for\nusbg_cmd_work, followed by a target-core BUG/Oops.\n\nThe generic target-core unlink path has no callback after\ncore_dev_del_lun() completes. Add an optional fabric_post_unlink()\ncallback and use it for the f_tcm port count. The count now remains\nnonzero until core_dev_del_lun() has finished draining active LUN\nreferences, preventing nexus removal from freeing the session during\ncommand completion.","Type":"Description","Title":"usb: gadget: f_tcm: keep port count until LUN teardown completes"}]}}}