{"id":"CVE-2022-50457","title":"mtd: core: Fix refcount error in del_mtd_device()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: core: Fix refcount error in del_mtd_device()\n\ndel_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which\nis mtd->dev.of_node. However, memset(&mtd->de…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 63aff1411fc609d737830b79c6b06ce62348c582 < 0de86087b20675c53fda2bc903dfc26a7ec99856","Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < f6016557f1ef7735963bd8691592d2797bbf91d2","Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < 616dc895d982026f41f500c88d1bfea004938cc8","Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < 56570bdad5e31c5c538cd6efff5c4510256e1bb4","Linux 5.17"],"published":"2025-10-01","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:17:10.412Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50457","references":[{"url":"https://git.kernel.org/stable/c/0de86087b20675c53fda2bc903dfc26a7ec99856"},{"url":"https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2"},{"url":"https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8"},{"url":"https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4"}],"tags":["cve.org"],"epss":0.00159,"epssPercentile":0.05086,"ingestedAt":"2026-11-03T11:43:15.779Z","slug":"CVE-2022-50457","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmtd: core: Fix refcount error in del_mtd_device()\n\ndel_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which\nis mtd->dev.of_node. However, memset(&mtd->dev, 0) is called before\nof_node_put(). As the result, of_node_put() won't do anything in\ndel_mtd_device(), and causes the refcount leak.\n\ndel_mtd_device()\n    memset(&mtd->dev, 0, sizeof(mtd->dev) # clear mtd->dev\n    of_node_put()\n        mtd_get_of_node(mtd) # mtd->dev is cleared, can't locate of_node\n                             # of_node_put(NULL) won't do anything\n\nFix the error by caching the pointer of the device_node.\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry: attach\noverlay node /spi/spi-sram@0\nCPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54\n    0d8a1edddf51f172ff5226989a7565c6313b08e2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nrel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014\nCall Trace:\n<TASK>\n    dump_stack_lvl+0x67/0x83\n    kobject_get+0x155/0x160\n    of_node_get+0x1f/0x30\n    of_fwnode_get+0x43/0x70\n    fwnode_handle_get+0x54/0x80\n    fwnode_get_nth_parent+0xc9/0xe0\n    fwnode_full_name_string+0x3f/0xa0\n    device_node_string+0x30f/0x750\n    pointer+0x598/0x7a0\n    vsnprintf+0x62d/0x9b0\n    ...\n    cfs_overlay_release+0x30/0x90\n    config_item_release+0xbe/0x1a0\n    config_item_put+0x5e/0x80\n    configfs_rmdir+0x3bd/0x540\n    vfs_rmdir+0x18c/0x320\n    do_rmdir+0x198/0x330\n    __x64_sys_rmdir+0x2c/0x40\n    do_syscall_64+0x37/0x90\n    entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n[<miquel.raynal@bootlin.com>: Light reword of the commit log]\n\n## Affected\n\n- `Linux >= 63aff1411fc609d737830b79c6b06ce62348c582 < 0de86087b20675c53fda2bc903dfc26a7ec99856`\n- `Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < f6016557f1ef7735963bd8691592d2797bbf91d2`\n- `Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < 616dc895d982026f41f500c88d1bfea004938cc8`\n- `Linux >= 00596576a05145a1b5672897a82ef87af00becf4 < 56570bdad5e31c5c538cd6efff5c4510256e1bb4`\n- `Linux 5.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}