{"id":"CVE-2026-90209","revision":"654bc94745634a26a564f5036f83ca9a","records":[{"revision":"654bc94745634a26a564f5036f83ca9a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90209","aliases":[],"title":"s390/debug: Fix deadlock during unregister","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/debug: Fix deadlock during unregister\n\nUnregistering an s390dbf debug area while one of the associated debugfs\nfiles is being written to can cause a deadlock:\n\n$ echo >.../vmur/level    $ rmmod vmur\n===================================================\ndebugfs write\ndebugfs_file_get()\n                          debug_unregister()\n                          mutex_lock(debug_mutex)\n                          debugfs_remove()\n                          wait for debugfs_file_put()\ndebug_file_ops.write()\ndebug_input()\nmutex_lock(debug_mutex) ==> DEADLOCK\n\nFix this by splitting debug_unregister() into an s390dbf and debugfs\npart, and running only the s390dbf part with debug_mutex locked.","state":0,"publishedAt":"2026-09-17T16:07:24.126+00:00","modifiedAt":"2026-10-19T08:59:45.47+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/s390/kernel/debug.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"183f8f6d64bb0510070c856b9927618c53014a7b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"a08b70ed2d1ec907353a72f15163b8e34ff4b2f8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"5d83f3faa3fb7f23f298cfd40382611999de5d1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"54e1259b75d6402a1d0cfb822b9bb2c507e53dab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9372a82892c2caa6bccab9a4081166fa769699f8\",\n                            \"lessThan\": \"445c31ac638fd1af203d79bdf25fc0cb3149fbbc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c68ba4a708fbd0efdc384cd29250bb292a45e559\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"86f9980909f31ab205323eeeb290fe3cbb4952b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe5793e90d3f572a87ba67fe2f0e1679fdff14f8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e234f66168f0d50c0d28154fb983a14e85c3c526\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.4.146\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.65\",\n                            \"lessThan\": \"5.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.13.17\",\n                            \"lessThan\": \"5.14\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.14.4\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/s390/kernel/debug.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed","https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b","https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8","https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba","https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d","https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab","https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90209","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90209","identifiers":["CVE-2026-90209"]},"retained":false,"historicalAffected":[]}],"coverage":[]}