Security readout for executives and security teams
Plain-English summary
A Linux kernel flaw in the NFS server can access memory after it has been freed during concurrent export-cache reading and cleanup. A locally authenticated user may be able to trigger serious confidentiality, integrity, or availability effects. The evidence does not establish remote exploitation or attacks in the wild.
Executive priority
Treat this as an accelerated high-priority kernel update for NFS servers and multi-user Linux systems. Local access reduces urgency compared with an unauthenticated remote flaw, but the 7.8 CVSS score and potential system-wide impact justify prompt remediation. There is no supplied evidence of active exploitation.
Technical view
The nfsd cache display paths c_show and e_show can drop the final svc_export or svc_expkey reference while protected by RCU. This creates a use-after-free and may call a sleeping path_put operation inside an RCU read-side critical section. The fix defers release through rcu_work until after an RCU grace period.
Likely exposure
Exposure is most likely on systems running an affected Linux kernel with NFS server functionality active. The CVSS vector indicates local access and low privileges are required. The supplied version data includes ambiguous entries, so distribution-specific package and backport status must be verified rather than inferred solely from kernel version strings.
Exploitation context
CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or a public weaponized exploit. The demonstrated condition produced a KASAN use-after-free during procfs cache display while NFS service state was being purged. Real-world reliability and impact beyond the documented reproducer remain unconfirmed.
Researcher notes
The source establishes a concurrency-sensitive CWE-416 in nfsd export-cache lifetime handling. Four upstream stable commits are cited. The affected-version data contains repeated commit identifiers and an anomalous "0" entry, limiting precise branch conclusions. Researchers should use commit ancestry and distribution backport records for authoritative exposure mapping.
Mitigation direction
- Update to a vendor-supported kernel containing the applicable CVE-2024-53216 stable fix.
- Reboot affected systems into the corrected kernel after applying the update.
- Confirm fixed package and backport status through the Linux distribution vendor's guidance.
- Prioritize NFS servers and shared systems where untrusted local users have accounts.
Validation and detection
- Inventory active kernel versions on systems providing Linux NFS server services.
- Check vendor advisories or changelogs for CVE-2024-53216 or the cited stable commits.
- After reboot, confirm the corrected kernel is running rather than merely installed.
- Review kernel logs for use-after-free, suspicious RCU usage, or nfsd-related crashes.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2024-53216 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/bd8524148dd8c123334b066faa90590ba2ef8e6fCVE reference, Linux
- https://git.kernel.org/stable/c/2e4854599200f4d021df8ae17e69221d7c149f3eCVE reference, Linux
- https://git.kernel.org/stable/c/ad4363a24a5746b257c0beb5d8cc68f9b62c173fCVE reference, Linux
- https://git.kernel.org/stable/c/f8c989a0c89a75d30f899a7cabdc14d72522bb8dCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.