Security readout for executives and security teams
Plain-English summary
A missing bounds check in Linux bcachefs superblock validation could allow malformed journal data to extend beyond its expected section. The supplied CVSS assessment indicates potentially serious confidentiality, integrity, and availability consequences. Exposure appears local and limited to systems using affected bcachefs versions.
Executive priority
Treat as a high-priority kernel maintenance issue on systems using bcachefs, especially where untrusted filesystem content may be processed. Systems not using bcachefs are less likely to be exposed. Request rapid inventory and vendor-version verification before setting remediation deadlines.
Technical view
CVE-2024-35948 concerns bcachefs validation of journal entries stored in the superblock clean section. Validation failed to reject entries extending beyond that section. The kernel change adds the missing boundary check. The source notes no item-level repair support, although superblocks are checksummed, validated before writing, and backed up.
Likely exposure
Prioritize Linux systems running affected kernel versions where bcachefs filesystems are present or processed. The bundle identifies versions 6.7 through 6.9 as affected, but does not provide a complete distribution-specific package or fixed-release mapping.
Exploitation context
The CVSS vector describes local, low-complexity access without privileges or user interaction. CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or a public exploit. The precise practical path from malformed filesystem metadata to the rated impacts is not detailed.
Researcher notes
The record classifies this as CWE-400 and scores it 8.4, while the description specifically identifies an out-of-bounds validation condition. The provided version data is incomplete or ambiguously encoded, and no repair code exists for individual affected items. Validate vendor backports rather than relying only on upstream version numbers.
Mitigation direction
- Identify systems using bcachefs and record their kernel and distribution package versions.
- Apply vendor-provided kernel updates containing the referenced correction.
- Consult distribution advisories for precise affected and fixed package versions.
- Restrict untrusted users from introducing or mounting untrusted bcachefs storage pending remediation.
Validation and detection
- Confirm whether bcachefs filesystems, images, or removable media are used or processed.
- Compare installed kernels against applicable distribution security advisories.
- Verify the deployed kernel includes the referenced stable correction or vendor backport.
- After updating, confirm systems boot normally and bcachefs volumes remain accessible.
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
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ATT&CK lookup starting points
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CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2024-35948 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
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H2.55.9CISA-ADPCVSS: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
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/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/fcdbc1d7a4b638e5d5668de461f320386f3002aaCVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.