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CVE-2024-50241 (GCVE-0-2024-50241)

Vulnerability from cvelistv5 – Published: 2024-11-09 10:14 – Updated: 2026-08-05 11:42
VLAI
Title
NFSD: Initialize struct nfsd4_copy earlier
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Initialize struct nfsd4_copy earlier Ensure the refcount and async_copies fields are initialized early. cleanup_async_copy() will reference these fields if an error occurs in nfsd4_copy(). If they are not correctly initialized, at the very least, a refcount underflow occurs.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9e52ff544e0bfa09ee339fd7b0937ee3c080c24e , < 059434d23c4578d9d02efb92d848ea21bc640112 (git)
Affected: 43e46ee5efc03990b223f7aa8b77aa9c3d3acfdf , < 7267625baf365a969f1b25ded6f07b64bc90ec5b (git)
Affected: 7ea9260874b779637aff6d24c344b8ef4ac862a0 , < c3074003fa6837c2b89a34d8d12d9463b59d22d6 (git)
Affected: ae267989b7b7933dfedcd26468d0a88fc3a9da9e , < 421f1a2a1afb47d88de09457ef7687e1df7bc997 (git)
Affected: 6a488ad7745b8f64625c6d3a24ce7e448e83f11b , < e30a9a2f69c34a00a3cb4fd45c5d231929e66fb1 (git)
Affected: aadc3bbea163b6caaaebfdd2b6c4667fbc726752 , < 63fab04cbd0f96191b6e5beedc3b643b01c15889 (git)
Affected: b4e21431a0db4854b5023cd5af001be557e6c3db (git)
Affected: 6.10.14 , < 6.11 (semver)
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Linux Linux Affected: 6.11.3 , < 6.11.7 (semver)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Initialize struct nfsd4_copy earlier\n\nEnsure the refcount and async_copies fields are initialized early.\ncleanup_async_copy() will reference these fields if an error occurs\nin nfsd4_copy(). If they are not correctly initialized, at the very\nleast, a refcount underflow occurs."
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              "lang": "en",
              "value": "AV:N - The flaw is in nfsd\u0027s NFSv4.2 `OP_COPY` handler (`fs/nfsd/nfs4proc.c:nfsd4_copy()`), reached purely by sending a COMPOUND over TCP/2049 from a remote NFS client. The `ca_synchronous` flag that selects the vulnerable async branch is decoded directly from the wire in `nfsd4_decode_copy()`.\nAC:L - The attacker fully controls both trigger conditions \u2014 setting `ca_synchronous=false` and issuing more concurrent async COPYs than `sp_nrthreads` (default 8) by first parking several long-running copies. There is no race outside the attacker\u0027s control, no memory-layout dependency, and no unusual kernel configuration needed for the intra-server path.\nPR:N - Under AUTH_SYS \u2014 the default and overwhelmingly common NFS configuration \u2014 the server verifies no secret; a client simply asserts a UID to complete EXCHANGE_ID/CREATE_SESSION and OPEN the source/destination files, so no credentials in the CVSS sense are required. This matches the PR:N assigned to CVE-2024-53073, the companion fix to the identical error path.\nUI:N - The attacker\u0027s own COPY requests drive the entire sequence; no administrator or user on the NFS server has to open a file, mount anything, or take any action.\nS:U - The refcount underflow and leaked allocation are confined to the NFS server kernel\u0027s own memory and security authority, with no crossing into a hypervisor, IOMMU, or sandbox boundary.\nC:N - The underflow is caught by `refcount_warn_saturate()` and the object is simply never freed \u2014 there is no out-of-bounds read, no use-after-free of live data, and nothing from kernel memory is returned to the requesting client.\nI:N - No attacker-controlled write occurs: the leaked `struct nfsd4_copy` is unreachable and its refcount is saturated, so it is never reused or freed, yielding no corruption or control-flow primitive.\nA:H - `WARN_ONCE(\"refcount_t: underflow; use-after-free\")` panics the server outright on the common hardened/cloud setting `panic_on_warn=1`, and absent that, every triggering request permanently leaks a ~0.5 KB slab object, giving an unauthenticated remote client an unbounded kernel memory-exhaustion primitive that drives the NFS server to OOM."
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    "datePublished": "2024-11-09T10:14:51.119Z",
    "dateReserved": "2024-10-21T19:36:19.976Z",
    "dateUpdated": "2026-08-05T11:42:42.206Z",
    "state": "PUBLISHED"
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Si no se inicializan correctamente, como m\u00ednimo, se produce un desbordamiento de 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T12:24:34+00:00",
      "cve": "CVE-2024-50241",
      "id": "CVE-2024-50241",
      "initial_release_date": "2024-11-09T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Initialize struct nfsd4_copy earlier",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50241.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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