CVE-2023-53501 (GCVE-0-2023-53501)
Vulnerability from cvelistv5
Published
2025-10-01 11:45
Modified
2025-10-01 11:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind When unbinding pasid - a race condition exists vs outstanding page faults. To prevent this, the pasid_state object contains a refcount. * set to 1 on pasid bind * incremented on each ppr notification start * decremented on each ppr notification done * decremented on pasid unbind Since refcount_dec assumes that refcount will never reach 0: the current implementation causes the following to be invoked on pasid unbind: REFCOUNT_WARN("decrement hit 0; leaking memory") Fix this issue by changing refcount_dec to refcount_dec_and_test to explicitly handle refcount=1.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13ed255248dfbbb7f23f9170c7a537fb9ca22c73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/534103bcd52ca9c1fecbc70e717b4a538dc4ded8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98d86bf32187db27946ca817c2467a5f2f7aa02f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ccc51be3126b25cfe9351dbffde946c925cc28a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22
Impacted products
Vendor Product Version
Linux Linux Version: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a
Version: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a
Version: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a
Version: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a
Version: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a
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   Linux Linux Version: 5.15
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{
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind\n\nWhen unbinding pasid - a race condition exists vs outstanding page faults.\n\nTo prevent this, the pasid_state object contains a refcount.\n    * set to 1 on pasid bind\n    * incremented on each ppr notification start\n    * decremented on each ppr notification done\n    * decremented on pasid unbind\n\nSince refcount_dec assumes that refcount will never reach 0:\n  the current implementation causes the following to be invoked on\n  pasid unbind:\n        REFCOUNT_WARN(\"decrement hit 0; leaking memory\")\n\nFix this issue by changing refcount_dec to refcount_dec_and_test\nto explicitly handle refcount=1."
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      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:45:52.204Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/534103bcd52ca9c1fecbc70e717b4a538dc4ded8"
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      ],
      "title": "iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53501",
    "datePublished": "2025-10-01T11:45:52.204Z",
    "dateReserved": "2025-10-01T11:39:39.404Z",
    "dateUpdated": "2025-10-01T11:45:52.204Z",
    "state": "PUBLISHED"
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}


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