CVE-2026-80854

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80854", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.797Z", "datePublished": "2026-09-04T15:55:06.478Z", "dateUpdated": "2026-10-19T08:44:48.320Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:44:48.320Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_fabric_configfs.c", "drivers/usb/gadget/function/f_tcm.c", "include/target/target_core_fabric.h"], "versions": [{"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "c494c5562ca69b61a82f566e3b87a445d2c28929", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "c1f359d9a5efed458946063de65ddbeaacc4f165", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "178f59a0bccd3f66cdfa5184310f31a58b7257c4", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "ad6f0375d2e93a1d8c015463e5e92dfcb26e311b", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "2efbfd42441d3ef8137aff2d59e9835e1d5ae780", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "bbd6aa311a9f4dd17822c7557451458d3d2e980b", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "eaa96a8458f54d6cf0954242ab8b1df2a6fccafa", "status": "affected", "versionType": "git"}, {"version": "c52661d60f636d17e26ad834457db333bd1df494", "lessThan": "c39d0916da47d94909391876c9e5bd429ea7b1b9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_fabric_configfs.c", "drivers/usb/gadget/function/f_tcm.c", "include/target/target_core_fabric.h"], "versions": [{"version": "3.5", "status": "affected"}, {"version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.13", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.3", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.10.269"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.187"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.108"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.49"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.2.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.3"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80854", "lastModified": "2026-10-19T09:17:21.017", "metrics": {}, "published": "2026-09-04T16:18:14.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,c494c5562ca69b61a82f566e3b87a445d2c28929)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,c1f359d9a5efed458946063de65ddbeaacc4f165)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,178f59a0bccd3f66cdfa5184310f31a58b7257c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,ad6f0375d2e93a1d8c015463e5e92dfcb26e311b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,2efbfd42441d3ef8137aff2d59e9835e1d5ae780)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,bbd6aa311a9f4dd17822c7557451458d3d2e980b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,eaa96a8458f54d6cf0954242ab8b1df2a6fccafa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c52661d60f636d17e26ad834457db333bd1df494,c39d0916da47d94909391876c9e5bd429ea7b1b9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.269,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.220,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.187,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.156,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.108,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.49,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.13,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.3,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-04T18:45:03.011180+00:00", "updated": "2026-09-05T02:00:12.487776+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-362"]}