# CVE-2022-50304: mtd: core: fix possible resource leak in init_mtd()

CVE-2022-50304 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50304, released September 15, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50304
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2025
- Weakness: Missing Release of Memory after Effective Lifetime
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-50304

## Description

In the Linux kernel, the following vulnerability has been resolved:  mtd: core: fix possible resource leak in init_mtd()  I got the error report while inject fault in init_mtd():  sysfs: cannot create duplicate filename '/devices/virtual/bdi/mtd-0' Call Trace:  <TASK>  dump_stack_lvl+0x67/0x83  sysfs_warn_dup+0x60/0x70  sysfs_create_dir_ns+0x109/0x120  kobject_add_internal+0xce/0x2f0  kobject_add+0x98/0x110  device_add+0x179/0xc00  device_create_groups_vargs+0xf4/0x100  device_create+0x7b/0xb0  bdi_register_va.part.13+0x58/0x2d0  bdi_register+0x9b/0xb0  init_mtd+0x62/0x171 [mtd]  do_one_initcall+0x6c/0x3c0  do_init_module+0x58/0x222  load_module+0x268e/0x27d0  __do_sys_finit_module+0xd5/0x140  do_syscall_64+0x37/0x90  entry_SYSCALL_64_after_hwframe+0x63/0xcd  </TASK> kobject_add_internal failed for mtd-0 with -EEXIST, don't try to register 	things with the same name in the same directory. Error registering mtd class or bdi: -17  If init_mtdchar() fails in init_mtd(), mtd_bdi will not be unregistered, as a result, we can't load the mtd module again, to fix this by calling bdi_unregister(mtd_bdi) after out_procfs label.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50304](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50304.md) | Sep 15, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50304](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50304.md) | Sep 15, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50304](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50304.md) | Sep 15, 2025 |

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