CVE-2025-21739 (GCVE-0-2025-21739)
Vulnerability from cvelistv5
Published
2025-02-27 02:12
Modified
2026-06-01 16:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Fix use-after free in init error and remove paths devm_blk_crypto_profile_init() registers a cleanup handler to run when the associated (platform-) device is being released. For UFS, the crypto private data and pointers are stored as part of the ufs_hba's data structure 'struct ufs_hba::crypto_profile'. This structure is allocated as part of the underlying ufshcd and therefore Scsi_host allocation. During driver release or during error handling in ufshcd_pltfrm_init(), this structure is released as part of ufshcd_dealloc_host() before the (platform-) device associated with the crypto call above is released. Once this device is released, the crypto cleanup code will run, using the just-released 'struct ufs_hba::crypto_profile'. This causes a use-after-free situation: Call trace: kfree+0x60/0x2d8 (P) kvfree+0x44/0x60 blk_crypto_profile_destroy_callback+0x28/0x70 devm_action_release+0x1c/0x30 release_nodes+0x6c/0x108 devres_release_all+0x98/0x100 device_unbind_cleanup+0x20/0x70 really_probe+0x218/0x2d0 In other words, the initialisation code flow is: platform-device probe ufshcd_pltfrm_init() ufshcd_alloc_host() scsi_host_alloc() allocation of struct ufs_hba creation of scsi-host devices devm_blk_crypto_profile_init() devm registration of cleanup handler using platform-device and during error handling of ufshcd_pltfrm_init() or during driver removal: ufshcd_dealloc_host() scsi_host_put() put_device(scsi-host) release of struct ufs_hba put_device(platform-device) crypto cleanup handler To fix this use-after free, change ufshcd_alloc_host() to register a devres action to automatically cleanup the underlying SCSI device on ufshcd destruction, without requiring explicit calls to ufshcd_dealloc_host(). This way: * the crypto profile and all other ufs_hba-owned resources are destroyed before SCSI (as they've been registered after) * a memleak is plugged in tc-dwc-g210-pci.c remove() as a side-effect * EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) can be removed fully as it's not needed anymore * no future drivers using ufshcd_alloc_host() could ever forget adding the cleanup
References
Impacted products
Vendor Product Version
Linux Linux Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
Version: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Fix use-after free in init error and remove paths\n\ndevm_blk_crypto_profile_init() registers a cleanup handler to run when\nthe associated (platform-) device is being released. For UFS, the\ncrypto private data and pointers are stored as part of the ufs_hba\u0027s\ndata structure \u0027struct ufs_hba::crypto_profile\u0027. This structure is\nallocated as part of the underlying ufshcd and therefore Scsi_host\nallocation.\n\nDuring driver release or during error handling in ufshcd_pltfrm_init(),\nthis structure is released as part of ufshcd_dealloc_host() before the\n(platform-) device associated with the crypto call above is released.\nOnce this device is released, the crypto cleanup code will run, using\nthe just-released \u0027struct ufs_hba::crypto_profile\u0027. This causes a\nuse-after-free situation:\n\n  Call trace:\n   kfree+0x60/0x2d8 (P)\n   kvfree+0x44/0x60\n   blk_crypto_profile_destroy_callback+0x28/0x70\n   devm_action_release+0x1c/0x30\n   release_nodes+0x6c/0x108\n   devres_release_all+0x98/0x100\n   device_unbind_cleanup+0x20/0x70\n   really_probe+0x218/0x2d0\n\nIn other words, the initialisation code flow is:\n\n  platform-device probe\n    ufshcd_pltfrm_init()\n      ufshcd_alloc_host()\n        scsi_host_alloc()\n          allocation of struct ufs_hba\n          creation of scsi-host devices\n    devm_blk_crypto_profile_init()\n      devm registration of cleanup handler using platform-device\n\nand during error handling of ufshcd_pltfrm_init() or during driver\nremoval:\n\n  ufshcd_dealloc_host()\n    scsi_host_put()\n      put_device(scsi-host)\n        release of struct ufs_hba\n  put_device(platform-device)\n    crypto cleanup handler\n\nTo fix this use-after free, change ufshcd_alloc_host() to register a\ndevres action to automatically cleanup the underlying SCSI device on\nufshcd destruction, without requiring explicit calls to\nufshcd_dealloc_host(). This way:\n\n    * the crypto profile and all other ufs_hba-owned resources are\n      destroyed before SCSI (as they\u0027ve been registered after)\n    * a memleak is plugged in tc-dwc-g210-pci.c remove() as a\n      side-effect\n    * EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) can be removed fully as\n      it\u0027s not needed anymore\n    * no future drivers using ufshcd_alloc_host() could ever forget\n      adding the cleanup"
        }
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        "dateUpdated": "2026-06-01T16:05:01.006Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/0a6895c03b1f439236e2d22b1a69ebfc1eb9d5ea"
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        {
          "url": "https://git.kernel.org/stable/c/d06eb2620d3bf16056b8b7ea3744dbb5e30512f4"
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          "url": "https://git.kernel.org/stable/c/0dc539b888fb5f56b6eeddd95433eab557d4b0c1"
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          "url": "https://git.kernel.org/stable/c/9c185beae09a3eb85f54777edafa227f7e03075d"
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        {
          "url": "https://git.kernel.org/stable/c/f8fb2403ddebb5eea0033d90d9daae4c88749ada"
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      "title": "scsi: ufs: core: Fix use-after free in init error and remove paths",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21739",
    "datePublished": "2025-02-27T02:12:14.581Z",
    "dateReserved": "2024-12-29T08:45:45.757Z",
    "dateUpdated": "2026-06-01T16:05:01.006Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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