{"cve":"CVE-2023-53665","nvd":{"published":"2025-10-07T16:15:50.280","modified":"2026-06-17T06:45:49.650","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: don't dereference mddev after export_rdev()\n\nExcept for initial reference, mddev->kobject is referenced by\nrdev->kobject, and if the last rdev is freed, there is no guarantee that\nmddev is still valid. Hence mddev should not be used anymore after\nexport_rdev().\n\nThis problem can be triggered by following test for mdadm at very\nlow rate:\n\nNew file: mdadm/tests/23rdev-lifetime\n\ndevname=${dev0##*/}\ndevt=`cat /sys/block/$devname/dev`\npid=\"\"\nruntime=2\n\nclean_up_test() {\n        pill -9 $pid\n        echo clear > /sys/block/md0/md/array_state\n}\n\ntrap 'clean_up_test' EXIT\n\nadd_by_sysfs() {\n        while true; do\n                echo $devt > /sys/block/md0/md/new_dev\n        done\n}\n\nremove_by_sysfs(){\n        while true; do\n                echo remove > /sys/block/md0/md/dev-${devname}/state\n        done\n}\n\necho md0 > /sys/module/md_mod/parameters/new_array || die \"create md0 failed\"\n\nadd_by_sysfs &\npid=\"$pid $!\"\n\nremove_by_sysfs &\npid=\"$pid $!\"\n\nsleep $runtime\nexit 0\n\nTest cmd:\n\n./test --save-logs --logdir=/tmp/ --keep-going --dev=loop --tests=23rdev-lifetime\n\nTest result:\n\ngeneral protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6bcb: 0000 [#4] PREEMPT SMP\nCPU: 0 PID: 1292 Comm: test Tainted: G      D W          6.5.0-rc2-00121-g01e55c376936 #562\nRIP: 0010:md_wakeup_thread+0x9e/0x320 [md_mod]\nCall Trace:\n <TASK>\n mddev_unlock+0x1b6/0x310 [md_mod]\n rdev_attr_store+0xec/0x190 [md_mod]\n sysfs_kf_write+0x52/0x70\n kernfs_fop_write_iter+0x19a/0x2a0\n vfs_write+0x3b5/0x770\n ksys_write+0x74/0x150\n __x64_sys_write+0x22/0x30\n do_syscall_64+0x40/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFix this problem by don't dereference mddev after export_rdev().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/7deac114be5fb25a4e865212ed0feaf5f85f2a28","https://git.kernel.org/stable/c/ad430ad0669d2757377373390d68e1454fc7a344"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2023-53665","score":0.0013,"percentile":0.02631,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}