Security readout for executives and security teams
Plain-English summary
A race in Linux FS-Cache/CacheFiles can leave one kernel task using a cache object while another withdraws it. The resulting null-pointer dereference can crash the kernel and interrupt hosted services. The supplied technical account demonstrates an availability failure; it does not demonstrate data theft or modification.
Executive priority
Treat this as a high-priority availability issue, especially on shared or service-critical Linux servers using filesystem caching. It is not presented as remotely exploitable or actively exploited, so prioritization should follow actual CacheFiles usage, local-access exposure, service criticality, and vendor patch availability.
Technical view
CVE-2024-45000 occurs because the FS-Cache cookie state machine can enter LRU discarding without checking the n_accesses counter. It may clear cookie->cache_priv while cachefiles_prepare_write still depends on that object, causing a kernel null-pointer dereference. The patch adds the missing access-count check and defers withdrawal until active access ends.
Likely exposure
Exposure is limited to Linux systems running affected kernel code and exercising NetFS FS-Cache/CacheFiles behavior. The CVSS vector requires local, low-privileged access and no user interaction. The flattened version information does not establish precise distribution-specific ranges or backports, so package status must be confirmed with each Linux vendor.
Exploitation context
The supplied sources do not report active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation would require local access and the relevant cache race conditions. The documented result is a kernel crash. Although CVSS assigns high confidentiality, integrity, and availability impacts, the provided description does not explain data compromise or privilege escalation.
Researcher notes
The failure requires concurrency among cookie state transitions, unuse or LRU discard handling, and cache write preparation. The missing n_accesses guard permits withdrawal during an active operation. Stable-kernel references document fixes, but the supplied version representation is insufficient for definitive branch-by-branch exposure mapping. No CWE classification or public exploitation evidence is supplied.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the applicable stable fix for CVE-2024-45000.
- Check distribution security advisories for package-specific versions and backports before relying on upstream version numbers.
- Prioritize multi-user systems that actively use NetFS FS-Cache or CacheFiles.
- If immediate patching is impossible, request temporary risk-reduction guidance from the operating-system vendor.
Validation and detection
- Inventory running kernel versions and compare them with distribution advisories for CVE-2024-45000.
- Confirm the vendor kernel package includes the applicable upstream stable fix or documented backport.
- Identify systems and workloads using NetFS FS-Cache or CacheFiles functionality.
- After updating and rebooting, verify the intended patched kernel is running.
- Review kernel logs for cachefiles_prepare_write null dereferences or related kernel oops events.
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-2024-45000 mapping review
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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
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability 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
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/b8a50877f68efdcc0be3fcc5116e00c31b90e45bCVE reference, Linux
- https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6CVE reference, Linux
- https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1dCVE reference, Linux
- https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlCVE reference, CVE
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.