{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50283", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T13:58:00.976Z", "datePublished": "2025-09-15T14:21:19.574Z", "dateUpdated": "2026-08-05T08:58:02.384Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:02.384Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: core: add missing of_node_get() in dynamic partitions code\n\nThis fixes unbalanced of_node_put():\n[ 1.078910] 6 cmdlinepart partitions found on MTD device gpmi-nand\n[ 1.085116] Creating 6 MTD partitions on \"gpmi-nand\":\n[ 1.090181] 0x000000000000-0x000008000000 : \"nandboot\"\n[ 1.096952] 0x000008000000-0x000009000000 : \"nandfit\"\n[ 1.103547] 0x000009000000-0x00000b000000 : \"nandkernel\"\n[ 1.110317] 0x00000b000000-0x00000c000000 : \"nanddtb\"\n[ 1.115525] ------------[ cut here ]------------\n[ 1.120141] refcount_t: addition on 0; use-after-free.\n[ 1.125328] WARNING: CPU: 0 PID: 1 at lib/refcount.c:25 refcount_warn_saturate+0xdc/0x148\n[ 1.133528] Modules linked in:\n[ 1.136589] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc7-next-20220930-04543-g8cf3f7\n[ 1.146342] Hardware name: Freescale i.MX8DXL DDR3L EVK (DT)\n[ 1.151999] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 1.158965] pc : refcount_warn_saturate+0xdc/0x148\n[ 1.163760] lr : refcount_warn_saturate+0xdc/0x148\n[ 1.168556] sp : ffff800009ddb080\n[ 1.171866] x29: ffff800009ddb080 x28: ffff800009ddb35a x27: 0000000000000002\n[ 1.179015] x26: ffff8000098b06ad x25: ffffffffffffffff x24: ffff0a00ffffff05\n[ 1.186165] x23: ffff00001fdf6470 x22: ffff800009ddb367 x21: 0000000000000000\n[ 1.193314] x20: ffff00001fdfebe8 x19: ffff00001fdfec50 x18: ffffffffffffffff\n[ 1.200464] x17: 0000000000000000 x16: 0000000000000118 x15: 0000000000000004\n[ 1.207614] x14: 0000000000000fff x13: ffff800009bca248 x12: 0000000000000003\n[ 1.214764] x11: 00000000ffffefff x10: c0000000ffffefff x9 : 4762cb2ccb52de00\n[ 1.221914] x8 : 4762cb2ccb52de00 x7 : 205d313431303231 x6 : 312e31202020205b\n[ 1.229063] x5 : ffff800009d55c1f x4 : 0000000000000001 x3 : 0000000000000000\n[ 1.236213] x2 : 0000000000000000 x1 : ffff800009954be6 x0 : 000000000000002a\n[ 1.243365] Call trace:\n[ 1.245806] refcount_warn_saturate+0xdc/0x148\n[ 1.250253] kobject_get+0x98/0x9c\n[ 1.253658] of_node_get+0x20/0x34\n[ 1.257072] of_fwnode_get+0x3c/0x54\n[ 1.260652] fwnode_get_nth_parent+0xd8/0xf4\n[ 1.264926] fwnode_full_name_string+0x3c/0xb4\n[ 1.269373] device_node_string+0x498/0x5b4\n[ 1.273561] pointer+0x41c/0x5d0\n[ 1.276793] vsnprintf+0x4d8/0x694\n[ 1.280198] vprintk_store+0x164/0x528\n[ 1.283951] vprintk_emit+0x98/0x164\n[ 1.287530] vprintk_default+0x44/0x6c\n[ 1.291284] vprintk+0xf0/0x134\n[ 1.294428] _printk+0x54/0x7c\n[ 1.297486] of_node_release+0xe8/0x128\n[ 1.301326] kobject_put+0x98/0xfc\n[ 1.304732] of_node_put+0x1c/0x28\n[ 1.308137] add_mtd_device+0x484/0x6d4\n[ 1.311977] add_mtd_partitions+0xf0/0x1d0\n[ 1.316078] parse_mtd_partitions+0x45c/0x518\n[ 1.320439] mtd_device_parse_register+0xb0/0x274\n[ 1.325147] gpmi_nand_probe+0x51c/0x650\n[ 1.329074] platform_probe+0xa8/0xd0\n[ 1.332740] really_probe+0x130/0x334\n[ 1.336406] __driver_probe_device+0xb4/0xe0\n[ 1.340681] driver_probe_device+0x3c/0x1f8\n[ 1.344869] __driver_attach+0xdc/0x1a4\n[ 1.348708] bus_for_each_dev+0x80/0xcc\n[ 1.352548] driver_attach+0x24/0x30\n[ 1.356127] bus_add_driver+0x108/0x1f4\n[ 1.359967] driver_register+0x78/0x114\n[ 1.363807] __platform_driver_register+0x24/0x30\n[ 1.368515] gpmi_nand_driver_init+0x1c/0x28\n[ 1.372798] do_one_initcall+0xbc/0x238\n[ 1.376638] do_initcall_level+0x94/0xb4\n[ 1.380565] do_initcalls+0x54/0x94\n[ 1.384058] do_basic_setup+0x1c/0x28\n[ 1.387724] kernel_init_freeable+0x110/0x188\n[ 1.392084] kernel_init+0x20/0x1a0\n[ 1.395578] ret_from_fork+0x10/0x20\n[ 1.399157] ---[ end trace 0000000000000000 ]---\n[ 1.403782] ------------[ cut here ]------------" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only through local MTD partition registration (add_mtd_device → mtd_check_of_node), either at platform/NAND probe (e.g. gpmi_nand_probe) or via the local BLKPG_ADD_PARTITION ioctl on /dev/mtd*; it is not reachable via network packets or adjacent-link protocols.\nAC:L - On an OF_DYNAMIC system whose MTD master has an of_node, each dynamically created partition deterministically executes the unbalanced of_node_put(parent_dn) with no race or attacker-uncontrollable memory layout required.\nPR:L - The underflow occurs automatically during boot-time driver probe on affected DT/cmdlinepart configurations with no capability check on that path; per the higher-severity reading used for similar probe-time of_node_put underflow bugs, a basic local user is sufficient rather than requiring init-namespace root.\nUI:N - Partition parsing and mtd_check_of_node run as part of normal driver initialization (or a local actor adding partitions via BLKPG); no separate victim action such as mounting a filesystem is required.\nS:U - The corrupted object is a kernel device_node/kobject and any resulting underflow or use-after-free remains inside the host kernel’s security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unbalanced of_node_put drives the parent device_node kobject to refcount zero, producing a zombie kobject (and on OF_DYNAMIC/overlay platforms a free-while-referenced device_node), which per UAF guidance enables heap reuse and arbitrary kernel disclosure.\nI:H - A device_node/kobject left at refcount zero or freed while still referenced by the MTD parent is a heap-spray target whose fields can be overwritten, converting the underflow into an arbitrary-write and control-flow hijack primitive.\nA:H - The demonstrated impact is refcount_warn_saturate() (“refcount_t: addition on 0; use-after-free”), which is fatal under panic_on_warn, and the resulting corrupted/zombie kobject causes kernel oopses even when not fully exploited." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/mtdcore.c" ], "versions": [ { "version": "ad9b10d1eaada169bd764abcab58f08538877e26", "lessThan": "9e54ce00505d291ef88f2c05e5eef46269daf83c", "status": "affected", "versionType": "git" }, { "version": "ad9b10d1eaada169bd764abcab58f08538877e26", "lessThan": "12b58961de0bd88b3c7dfa5d21f6d67f4678b780", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/mtdcore.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.7", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9e54ce00505d291ef88f2c05e5eef46269daf83c" }, { "url": "https://git.kernel.org/stable/c/12b58961de0bd88b3c7dfa5d21f6d67f4678b780" } ], "title": "mtd: core: add missing of_node_get() in dynamic partitions code", "x_generator": { "engine": "bippy-1.2.0" } } } }