CVE-2022-50457 (GCVE-0-2022-50457)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2026-05-11 19:19
VLAI
Title
mtd: core: Fix refcount error in del_mtd_device()
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: core: Fix refcount error in del_mtd_device() del_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which is mtd->dev.of_node. However, memset(&mtd->dev, 0) is called before of_node_put(). As the result, of_node_put() won't do anything in del_mtd_device(), and causes the refcount leak. del_mtd_device() memset(&mtd->dev, 0, sizeof(mtd->dev) # clear mtd->dev of_node_put() mtd_get_of_node(mtd) # mtd->dev is cleared, can't locate of_node # of_node_put(NULL) won't do anything Fix the error by caching the pointer of the device_node. OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/spi-sram@0 CPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54 0d8a1edddf51f172ff5226989a7565c6313b08e2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x67/0x83 kobject_get+0x155/0x160 of_node_get+0x1f/0x30 of_fwnode_get+0x43/0x70 fwnode_handle_get+0x54/0x80 fwnode_get_nth_parent+0xc9/0xe0 fwnode_full_name_string+0x3f/0xa0 device_node_string+0x30f/0x750 pointer+0x598/0x7a0 vsnprintf+0x62d/0x9b0 ... cfs_overlay_release+0x30/0x90 config_item_release+0xbe/0x1a0 config_item_put+0x5e/0x80 configfs_rmdir+0x3bd/0x540 vfs_rmdir+0x18c/0x320 do_rmdir+0x198/0x330 __x64_sys_rmdir+0x2c/0x40 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [<miquel.raynal@bootlin.com>: Light reword of the commit log]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 00596576a05145a1b5672897a82ef87af00becf4 , < f6016557f1ef7735963bd8691592d2797bbf91d2 (git)
Affected: 00596576a05145a1b5672897a82ef87af00becf4 , < 616dc895d982026f41f500c88d1bfea004938cc8 (git)
Affected: 00596576a05145a1b5672897a82ef87af00becf4 , < 56570bdad5e31c5c538cd6efff5c4510256e1bb4 (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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      "cve": "CVE-2022-50457",
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      "product_status:known_affected": "14",
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      "title": "kernel: mtd: core: Fix refcount error in del_mtd_device()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50457.json",
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      "cve": "CVE-2022-50457",
      "id": "CVE-2022-50457",
      "initial_release_date": "2025-10-01T23:32:22Z",
      "product_status:known_not_affected": "523",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50457",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50457.json",
      "version": "10"
    }
  }
}



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