{"id":"CVE-2022-50578","state":"PUBLISHED","title":"class: fix possible memory leak in __class_register()","description":"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->subsys' 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    [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320\n    [<000000005e4d70bc>] kstrdup+0x3a/0x70\n    [<00000000c2e5e85a>] kstrdup_const+0x68/0x80\n    [<000000000049a8c7>] kvasprintf_const+0x10b/0x190\n    [<0000000029123163>] kobject_set_name_vargs+0x56/0x150\n    [<00000000747219c9>] kobject_set_name+0xab/0xe0\n    [<0000000005f1ea4e>] __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    [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0\n    [<00000000ecf3dd95>] __class_register+0x86/0x49a","publishedAt":"2025-10-22T13:23:31.565Z","updatedAt":"2026-05-11T19:22:08.143Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"4efa5443817c1b6de22d401aeca5b2481e835f8c","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"3e0efc3f3f5e5c73996782f8db69963e501bb878","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"18a7200646958cf8e1b8a933de08122fc50676cd","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"e764ad5918a099ebeb909ccff83893a714e497e1","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"abaedb68a769e6bf36836b55a2f49b531c5f3f7b","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"8c3e8a6bdb5253b97ad532570f8b5db5f7a06407","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/class.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.303","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.270","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.229","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.163","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.86","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.16","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.2","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/class.c"]}],"references":["https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c","https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd","https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878","https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd","https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7","https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1","https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b","https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50578.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50578","state":"PUBLISHED","datePublished":"2025-10-22T13:23:31.565Z","dateUpdated":"2026-05-11T19:22:08.143Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-10-22T13:20:23.761Z"},"containers":{"cna":{"title":"class: fix possible memory leak in __class_register()","descriptions":[{"lang":"en","value":"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->subsys' 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    [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320\n    [<000000005e4d70bc>] kstrdup+0x3a/0x70\n    [<00000000c2e5e85a>] kstrdup_const+0x68/0x80\n    [<000000000049a8c7>] kvasprintf_const+0x10b/0x190\n    [<0000000029123163>] kobject_set_name_vargs+0x56/0x150\n    [<00000000747219c9>] kobject_set_name+0xab/0xe0\n    [<0000000005f1ea4e>] __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    [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0\n    [<00000000ecf3dd95>] __class_register+0x86/0x49a"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"4efa5443817c1b6de22d401aeca5b2481e835f8c","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"3e0efc3f3f5e5c73996782f8db69963e501bb878","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"18a7200646958cf8e1b8a933de08122fc50676cd","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"e764ad5918a099ebeb909ccff83893a714e497e1","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"abaedb68a769e6bf36836b55a2f49b531c5f3f7b","versionType":"git"},{"version":"ced6473e7486702f530a49f886b73195e4977734","status":"affected","lessThan":"8c3e8a6bdb5253b97ad532570f8b5db5f7a06407","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/class.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.303","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.270","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.229","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.163","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.86","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.16","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.2","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/class.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c"},{"url":"https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"},{"url":"https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878"},{"url":"https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd"},{"url":"https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"},{"url":"https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1"},{"url":"https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b"},{"url":"https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:22:08.143Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"4.14.303"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"4.19.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.4.229"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.10.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.15.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.0.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}