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CVE Record

CVE-2024-46751: btrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info()

In the Linux kernel, the following vulnerability has been resolved: btrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info() Instead of doing a BUG_ON() handle the error by returning -EUCLEAN, aborting the transaction and logging an error message.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Btrfs filesystem inconsistency can make an affected Linux kernel deliberately stop through BUG_ON rather than handle the error safely. This could disrupt services and potentially affect data security. The CVSS assessment is 7.8, but the supplied evidence does not establish real-world exploitation.

Executive priority

Treat this as high priority for Btrfs systems, especially multi-user or hosting workloads with local low-privileged access. Confirm exposure promptly and apply supported kernel updates during an expedited maintenance window. Systems not using Btrfs are lower priority for this CVE. No supplied evidence shows active exploitation.

Technical view

btrfs_lookup_extent_info() could encounter a zero extent reference count and execute BUG_ON(). The fix returns -EUCLEAN, logs an error, and aborts the transaction. CVSS 3.1 rates this local, low-complexity, low-privilege, no-user-interaction vulnerability with high confidentiality, integrity, and availability impacts.

Likely exposure

Linux hosts running affected kernels and using Btrfs are the clearest candidates. Exposure requires reaching the Btrfs condition involving a zero reference count. The bundle does not establish whether ordinary low-privileged activity can create that condition, and its version data does not define complete fixed-version ranges.

Exploitation context

The bundle marks this CVE as absent from KEV, and no cited source states that it is actively exploited. CVSS indicates a local, low-privileged vector, but available evidence does not demonstrate reliable attacker control, a public exploit, or remote reachability.

Researcher notes

Affected-version data mixes release numbers with repeated commit identifiers, so it should support screening rather than definitive range matching. The key behavioral change is replacing BUG_ON with -EUCLEAN, transaction abortion, and error logging. No CWE is assigned, and the sources do not explain how an attacker might induce the zero-reference condition.

Mitigation direction

  • Install a supported vendor kernel update incorporating the cited upstream stable fix.
  • Follow distribution guidance for exact fixed package versions; the bundle provides incomplete version ranges.
  • Reboot into the updated kernel and verify the running version.
  • Prioritize Btrfs hosts allowing local access by untrusted or low-privileged users.
  • Until patched, reduce unnecessary local access on affected high-value systems.

Validation and detection

  • Inventory running kernel versions and identify hosts using or configured for Btrfs.
  • Compare installed kernel packages with vendor advisories and the cited stable fixes.
  • After rebooting, confirm the updated kernel is active on every remediated host.
  • Review kernel logs for Btrfs failures, transaction aborts, BUG events, or EUCLEAN errors.
  • Use package provenance and controlled regression testing instead of triggering the fault in production.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2024-46751 mapping review

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
3Timeline events
2ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-46751Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0unaffected
LinuxLinux2.6.31, 0, 5.10.238, 5.15.184, 6.1.140, 6.6.92, 6.10.10, 6.11affected
Weakness

CWE details

No CWE listed

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