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 32 bytes):
80 fa b9 05 81 88 ff ff 08 30 23 16 81 88 ff ff .........0#.....
08 30 23 16 81 88 ff ff 00 00 00 00 00 00 00 00 .0#.............
backtrace:
[<000000007f001ffd>] __kmem_cache_alloc_node+0x157/0x220
[<000000006a389304>] kmalloc_trace+0x21/0x110
[<000000008d640eea>] watchdog_dev_register+0x4e/0x780 [watchdog]
[<0000000053c9f248>] __watchdog_register_device+0x4f0/0x680 [watchdog]
[<00000000b2979824>] watchdog_register_device+0xd2/0x110 [watchdog]
[<000000001f730178>] 0xffffffffc10880ae
[<000000007a1a8bcc>] do_one_initcall+0xcb/0x4d0
[<00000000b98be325>] do_init_module+0x1ca/0x5f0
[<0000000046d08e7c>] load_module+0x6133/0x70f0
...
unreferenced object 0xffff888105b9fa80 (size 16):
comm ""modprobe"", pid 28147, jiffies 4353426116 (age 61.741s)
hex dump (first 16 bytes):
77 61 74 63 68 64 6f 67 31 00 b9 05 81 88 ff ff watchdog1.......
backtrace:
[<000000007f001ffd>] __kmem_cache_alloc_node+0x157/0x220
[<00000000486ab89b>] __kmalloc_node_track_caller+0x44/0x1b0
[<000000005a39aab0>] kvasprintf+0xb5/0x140
[<0000000024806f85>] kvasprintf_const+0x55/0x180
[<000000009276cb7f>] kobject_set_name_vargs+0x56/0x150
[<00000000a92e820b>] dev_set_name+0xab/0xe0
[<00000000cec812c6>] watchdog_dev_register+0x285/0x780 [watchdog]
[<0000000053c9f248>] __watchdog_register_device+0x4f0/0x680 [watchdog]
[<00000000b2979824>] watchdog_register_device+0xd2/0x110 [watchdog]
[<000000001f730178>] 0xffffffffc10880ae
[<000000007a1a8bcc>] do_one_initcall+0xcb/0x4d0
[<00000000b98be325>] do_init_module+0x1ca/0x5f0
[<0000000046d08e7c>] load_module+0x6133/0x70f0
...
The reason is that put_device is not be called if cdev_device_add fails
and wdd->id != 0.
watchdog_cdev_register
wd_data = kzalloc [1]
err = dev_set_name [2]
..
err = cdev_device_add
if (err) {
if (wdd->id == 0) { // wdd->id != 0
..
}
return err; // [1],[2] would be leaked
To fix it, call put_device in all wdd->id cases.
References
Configurations
Configuration 1 (hide)
|
History
03 Dec 2025, 19:46
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-401 | |
| References | () https://git.kernel.org/stable/c/13721a2ac66b246f5802ba1b75ad8637e53eeecc - Patch | |
| References | () https://git.kernel.org/stable/c/23cc41c3f19c4d858c3708f1c0a06e94958e6c3b - Patch | |
| References | () https://git.kernel.org/stable/c/50808d034e199fe3ff7a9d2068a4eebeb6b4098a - Patch | |
| References | () https://git.kernel.org/stable/c/59e391b3fc507a15b7e8e9d9f4de87cae177c366 - Patch | |
| References | () https://git.kernel.org/stable/c/8c1655600f4f2839fb844fe8c70b2b65fadc7a56 - Patch | |
| References | () https://git.kernel.org/stable/c/ac099d94e0480c937aa9172ab64074981ca1a4d3 - Patch | |
| References | () https://git.kernel.org/stable/c/bf26b0e430ce34261f45959989edaf680b64d538 - Patch | |
| References | () https://git.kernel.org/stable/c/c5a21a5501508ae3afa2fe6d5a3e74a37fa48df3 - Patch |
Information
Published : 2025-09-15 15:15
Updated : 2025-12-03 19:46
NVD link : CVE-2023-53234
Mitre link : CVE-2023-53234
CVE.ORG link : CVE-2023-53234
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-401
Missing Release of Memory after Effective Lifetime