{"id":70177,"date":"2025-09-15T18:32:41","date_gmt":"2025-09-15T15:02:41","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2023-53234-watchdog-fix-kmemleak-in-watchdog_cdev_register\/"},"modified":"2025-09-15T18:32:41","modified_gmt":"2025-09-15T15:02:41","slug":"cve-2023-53234-watchdog-fix-kmemleak-in-watchdog_cdev_register","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2023-53234-watchdog-fix-kmemleak-in-watchdog_cdev_register\/","title":{"rendered":"CVE-2023-53234 – watchdog: Fix kmemleak in watchdog_cdev_register"},"content":{"rendered":"

CVE ID : <\/strong>CVE-2023-53234
\n
\nPublished : <\/strong> Sept. 15, 2025, 2:22 p.m. | 32\u00a0minutes ago
\n
\nDescription : <\/strong>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n

watchdog: Fix kmemleak in watchdog_cdev_register<\/p>\n

kmemleak reports memory leaks in watchdog_dev_register, as follows:
\nunreferenced object 0xffff888116233000 (size 2048):
\n comm “”modprobe””, pid 28147, jiffies 4353426116 (age 61.741s)
\n hex dump (first 32 bytes):
\n 80 fa b9 05 81 88 ff ff 08 30 23 16 81 88 ff ff ………0#…..
\n 08 30 23 16 81 88 ff ff 00 00 00 00 00 00 00 00 .0#………….
\n backtrace:
\n [] __kmem_cache_alloc_node+0x157\/0x220
\n [] kmalloc_trace+0x21\/0x110
\n [] watchdog_dev_register+0x4e\/0x780 [watchdog]\n [] __watchdog_register_device+0x4f0\/0x680 [watchdog]\n [] watchdog_register_device+0xd2\/0x110 [watchdog]\n [] 0xffffffffc10880ae
\n [] do_one_initcall+0xcb\/0x4d0
\n [] do_init_module+0x1ca\/0x5f0
\n [] load_module+0x6133\/0x70f0
\n …<\/p>\n

unreferenced object 0xffff888105b9fa80 (size 16):
\n comm “”modprobe””, pid 28147, jiffies 4353426116 (age 61.741s)
\n hex dump (first 16 bytes):
\n 77 61 74 63 68 64 6f 67 31 00 b9 05 81 88 ff ff watchdog1…….
\n backtrace:
\n [] __kmem_cache_alloc_node+0x157\/0x220
\n [] __kmalloc_node_track_caller+0x44\/0x1b0
\n [] kvasprintf+0xb5\/0x140
\n [] kvasprintf_const+0x55\/0x180
\n [] kobject_set_name_vargs+0x56\/0x150
\n [] dev_set_name+0xab\/0xe0
\n [] watchdog_dev_register+0x285\/0x780 [watchdog]\n [] __watchdog_register_device+0x4f0\/0x680 [watchdog]\n [] watchdog_register_device+0xd2\/0x110 [watchdog]\n [] 0xffffffffc10880ae
\n [] do_one_initcall+0xcb\/0x4d0
\n [] do_init_module+0x1ca\/0x5f0
\n [] load_module+0x6133\/0x70f0
\n …<\/p>\n

The reason is that put_device is not be called if cdev_device_add fails
\nand wdd->id != 0.<\/p>\n

watchdog_cdev_register
\n wd_data = kzalloc [1]\n err = dev_set_name [2]\n ..
\n err = cdev_device_add
\n if (err) {
\n if (wdd->id == 0) { \/\/ wdd->id != 0
\n ..
\n }
\n return err; \/\/ [1],[2] would be leaked<\/p>\n

To fix it, call put_device in all wdd->id cases.
\n
\nSeverity:<\/strong> 0.0 | NA
\n
\nVisit the link for more details, such as CVSS details, affected products, timeline, and more…<\/p>\n","protected":false},"excerpt":{"rendered":"

CVE ID : CVE-2023-53234 Published : Sept. 15, 2025, 2:22 p.m. | 32\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix kmemleak in watchdog_cdev_register kmemleak reports memory leaks in watchdog_dev_register, as follows: unreferenced object 0xffff888116233000 (size 2048): comm “”modprobe””, pid 28147, jiffies 4353426116 (age 61.741s) hex dump (first …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-70177","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/70177","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=70177"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/70177\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=70177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=70177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=70177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}