CVE-2025-21739 (GCVE-0-2025-21739)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:12 – Updated: 2025-05-04 07:20
VLAI?
Title
scsi: ufs: core: Fix use-after free in init error and remove paths
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
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 , < 0c77c0d754fe83cb154715fcfec6c3faef94f207 (git)
Affected: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 , < 9c185beae09a3eb85f54777edafa227f7e03075d (git)
Affected: d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 , < f8fb2403ddebb5eea0033d90d9daae4c88749ada (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.12.14 , ≤ 6.12.* (semver)
Unaffected: 6.13.3 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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          "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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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\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-03-24T15:39:37.656Z\"}}}",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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