{"id":"CVE-2026-89457","summary":"s390/dasd: Guard sysfs discipline callbacks against unallocated private data","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Guard sysfs discipline callbacks against unallocated private data\n\nSeveral sysfs show/store handlers call a discipline callback that\ndereferences device-\u003eprivate, either directly or through the\nDASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline\nis assigned before check_device() allocates device-\u003eprivate, so an\nunprivileged read of one of these world-readable attributes in that window\ndereferences a NULL pointer and panics.\n\nGuard the dereference inside each callback that actually touches\ndevice-\u003eprivate.","modified":"2026-09-13T03:47:18.037218578Z","published":"2026-09-11T19:43:20.701Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89457.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89457.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89457"},{"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":"c729696bcf8b23450043dd9c9972c15e53419ae4"},{"fixed":"536407b272402af679155910d7fdeeb4834eefb9"},{"fixed":"6452c13646af7c13d7f6668b6690cfb2427e7f7b"},{"fixed":"449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5"},{"fixed":"2a1780f9fc2493bd34c418a0be6fc58943afcecf"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89457.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89457.json"}}],"schema_version":"1.9.0"}