Security readout for executives and security teams
Plain-English summary
A flaw in the Linux kernel NFS server can mishandle cleanup after an NFSv4 copy operation fails. Uninitialized bookkeeping fields may cause a reference-count underflow, potentially disrupting the server. The supplied CVSS assessment rates remote denial of service as the primary impact, with no stated confidentiality or integrity impact.
Executive priority
Prioritize internet-facing or broadly reachable NFS servers because the stated impact is unauthenticated remote denial of service. Schedule prompt kernel remediation, while validating vendor backports before declaring exposure. There is no supplied evidence of active exploitation, so emergency incident response is not currently supported.
Technical view
In NFSD's nfsd4_copy() error path, cleanup_async_copy() may access the refcount and async_copies fields before initialization. The kernel fix initializes struct nfsd4_copy earlier. The supplied CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, scoring 7.5.
Likely exposure
Exposure is most relevant to Linux systems running NFSD and handling NFSv4 copy operations. Network reachability increases concern. The supplied version data mixes release numbers and commit identifiers, so exact vulnerable ranges should be confirmed against the running distribution's kernel advisory and backport history.
Exploitation context
The CVSS vector describes a network-reachable, low-complexity, unauthenticated availability risk. However, the source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation, public exploitation, or a weaponized proof of concept.
Researcher notes
The demonstrated defect is premature cleanup access to uninitialized refcount and async_copies fields, with refcount underflow explicitly identified. Broader consequences beyond availability are not established in the supplied evidence. Exact affected-version boundaries remain unclear because the bundle lists hashes and releases without explaining their range semantics.
Mitigation direction
- Install the distribution-supported kernel update containing the applicable upstream stable fix.
- Reboot into the updated kernel when required by the distribution's update process.
- Check Linux distribution guidance to confirm backport status for the deployed kernel build.
- Reduce unnecessary network exposure of NFS services until affected systems are updated.
Validation and detection
- Inventory systems running the Linux NFS server and identify their exact kernel builds.
- Confirm deployed kernels include the relevant fix through distribution advisories or backport records.
- Verify systems booted into the updated kernel after installation.
- Review monitoring for NFSD failures, kernel warnings, crashes, or unexpected service restarts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2024-50241 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/059434d23c4578d9d02efb92d848ea21bc640112CVE reference, Linux
- https://git.kernel.org/stable/c/7267625baf365a969f1b25ded6f07b64bc90ec5bCVE reference, Linux
- https://git.kernel.org/stable/c/c3074003fa6837c2b89a34d8d12d9463b59d22d6CVE reference, Linux
- https://git.kernel.org/stable/c/421f1a2a1afb47d88de09457ef7687e1df7bc997CVE reference, Linux
- https://git.kernel.org/stable/c/e30a9a2f69c34a00a3cb4fd45c5d231929e66fb1CVE reference, Linux
- https://git.kernel.org/stable/c/63fab04cbd0f96191b6e5beedc3b643b01c15889CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.