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CVE-2023-53606

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

nfsd: clean up potential nfsd_file refcount leaks in COPY codepath

There are two different flavors of the nfsd4_copy struct. One is embedded in the compound and is used directly in synchronous copies. The other is dynamically allocated, refcounted and tracked in the client struture. For the embedded one, the cleanup just involves releasing any nfsd_files held on its behalf. For the async one, the cleanup is a bit more involved, and we need to dequeue it from lists, unhash it, etc.

There is at least one potential refcount leak in this code now. If the kthread_create call fails, then both the src and dst nfsd_files in the original nfsd4_copy object are leaked.

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The cleanup in this codepath is also sort of weird. In the async copy case, we'll have up to four nfsd_file references (src and dst for both flavors of copy structure). They are both put at the end of nfsd4_do_async_copy, even though the ones held on behalf of the embedded one outlive that structure.

Change it so that we always clean up the nfsd_file refs held by the embedded copy structure before nfsd4_copy returns. Rework cleanup_async_copy to handle both inter and intra copies. Eliminate nfsd4_cleanup_intra_ssc since it now becomes a no-op.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clean up potential nfsd_file refcount leaks in COPY codepath\n\nThere are two different flavors of the nfsd4_copy struct. One is\nembedded in the compound and is used directly in synchronous copies. The\nother is dynamically allocated, refcounted and tracked in the client\nstruture. For the embedded one, the cleanup just involves releasing any\nnfsd_files held on its behalf. For the async one, the cleanup is a bit\nmore involved, and we need to dequeue it from lists, unhash it, etc.\n\nThere is at least one potential refcount leak in this code now. If the\nkthread_create call fails, then both the src and dst nfsd_files in the\noriginal nfsd4_copy object are leaked.\n\nThe cleanup in this codepath is also sort of weird. In the async copy\ncase, we'll have up to four nfsd_file references (src and dst for both\nflavors of copy structure). They are both put at the end of\nnfsd4_do_async_copy, even though the ones held on behalf of the embedded\none outlive that structure.\n\nChange it so that we always clean up the nfsd_file refs held by the\nembedded copy structure before nfsd4_copy returns. Rework\ncleanup_async_copy to handle both inter and intra copies. Eliminate\nnfsd4_cleanup_intra_ssc since it now becomes a no-op."
    }
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  "lastModified": "2026-08-04T10:19:14.223",
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