{"id":"CVE-2022-50578","summary":"class: fix possible memory leak in __class_register()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nclass: fix possible memory leak in __class_register()\n\nIf class_add_groups() returns error, the 'cp-\u003esubsys' need be\nunregister, and the 'cp' need be freed.\n\nWe can not call kset_unregister() here, because the 'cls' will\nbe freed in callback function class_release() and it's also\nfreed in caller's error path, it will cause double free.\n\nSo fix this by calling kobject_del() and kfree_const(name) to\ncleanup kobject. Besides, call kfree() to free the 'cp'.\n\nFault injection test can trigger this:\n\nunreferenced object 0xffff888102fa8190 (size 8):\n  comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n  hex dump (first 8 bytes):\n    70 6b 74 63 64 76 64 00                          pktcdvd.\n  backtrace:\n    [\u003c00000000e7c7703d\u003e] __kmalloc_track_caller+0x1ae/0x320\n    [\u003c000000005e4d70bc\u003e] kstrdup+0x3a/0x70\n    [\u003c00000000c2e5e85a\u003e] kstrdup_const+0x68/0x80\n    [\u003c000000000049a8c7\u003e] kvasprintf_const+0x10b/0x190\n    [\u003c0000000029123163\u003e] kobject_set_name_vargs+0x56/0x150\n    [\u003c00000000747219c9\u003e] kobject_set_name+0xab/0xe0\n    [\u003c0000000005f1ea4e\u003e] __class_register+0x15c/0x49a\n\nunreferenced object 0xffff888037274000 (size 1024):\n  comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n  hex dump (first 32 bytes):\n    00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff  .@'7.....@'7....\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n  backtrace:\n    [\u003c00000000151f9600\u003e] kmem_cache_alloc_trace+0x17c/0x2f0\n    [\u003c00000000ecf3dd95\u003e] __class_register+0x86/0x49a","modified":"2026-04-02T08:28:39.343416Z","published":"2025-10-22T13:23:31.565Z","related":["SUSE-SU-2025:4111-1","SUSE-SU-2025:4139-1","SUSE-SU-2025:4149-1","SUSE-SU-2025:4320-1","SUSE-SU-2025:4515-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50578.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878"},{"type":"WEB","url":"https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"},{"type":"WEB","url":"https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50578.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50578"},{"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":"ced6473e7486702f530a49f886b73195e4977734"},{"fixed":"4efa5443817c1b6de22d401aeca5b2481e835f8c"},{"fixed":"3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"},{"fixed":"3e0efc3f3f5e5c73996782f8db69963e501bb878"},{"fixed":"18a7200646958cf8e1b8a933de08122fc50676cd"},{"fixed":"417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"},{"fixed":"e764ad5918a099ebeb909ccff83893a714e497e1"},{"fixed":"abaedb68a769e6bf36836b55a2f49b531c5f3f7b"},{"fixed":"8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50578.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.303"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.229"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.163"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.0.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50578.json"}}],"schema_version":"1.7.5"}