CVE-2024-50241 (GCVE-0-2024-50241)
Vulnerability from cvelistv5 – Published: 2024-11-09 10:14 – Updated: 2026-08-05 11:42
VLAI
EPSS
VEX
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)
Assigner
References
6 references
Impacted products
2 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) |
guessed | |
| Linux | Linux |
Affected:
6.11.3 , < 6.11.7
(semver)
|
guessed |
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"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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"redhat_vex": {
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"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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