{"id":"CVE-2026-89457","state":"PUBLISHED","title":"s390/dasd: Guard sysfs discipline callbacks against unallocated private data","description":"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->private, either directly or through the\nDASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline\nis assigned before check_device() allocates device->private, 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->private.","publishedAt":"2026-09-11T19:43:20.701Z","updatedAt":"2026-10-19T08:47:06.711Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"644b666c202cce12ccfcf9ded67089b18f4f7659","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"4a042d8e5f34282577ece50515cea8bb1246914d","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"bd8b4572528f9604a13bf3c7c2a167f5cf222f72","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"57db27ccc162afe0726cffec0ae62e410ed2d0e9","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"536407b272402af679155910d7fdeeb4834eefb9","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"6452c13646af7c13d7f6668b6690cfb2427e7f7b","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"2a1780f9fc2493bd34c418a0be6fc58943afcecf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_eckd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_eckd.c"]}],"references":["https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659","https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d","https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72","https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9","https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9","https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b","https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5","https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89457.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89457","state":"PUBLISHED","datePublished":"2026-09-11T19:43:20.701Z","dateUpdated":"2026-10-19T08:47:06.711Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.707Z"},"containers":{"cna":{"title":"s390/dasd: Guard sysfs discipline callbacks against unallocated private data","descriptions":[{"lang":"en","value":"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->private, either directly or through the\nDASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline\nis assigned before check_device() allocates device->private, 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->private."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"644b666c202cce12ccfcf9ded67089b18f4f7659","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"4a042d8e5f34282577ece50515cea8bb1246914d","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"bd8b4572528f9604a13bf3c7c2a167f5cf222f72","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"57db27ccc162afe0726cffec0ae62e410ed2d0e9","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"536407b272402af679155910d7fdeeb4834eefb9","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"6452c13646af7c13d7f6668b6690cfb2427e7f7b","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5","versionType":"git"},{"version":"c729696bcf8b23450043dd9c9972c15e53419ae4","status":"affected","lessThan":"2a1780f9fc2493bd34c418a0be6fc58943afcecf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_eckd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_eckd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659"},{"url":"https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d"},{"url":"https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72"},{"url":"https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9"},{"url":"https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9"},{"url":"https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b"},{"url":"https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5"},{"url":"https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:47:06.711Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}