CVE-2011-0699

System crash via Btrfs slot-count truncation

Published Feb 20, 2020 · Updated Aug 6, 2024

Heap-based buffer overflow in Linux Kernel 2.6.37 allows local users to crash the system through a crafted Btrfs space-info slot count. The btrfs_ioctl_space_info function compares the caller-controlled unsigned 64-bit space_slots value as a signed integer, allowing truncation or wraparound in its allocation calculation and then copying more entries than the allocated buffer holds. Any local user able to issue the Btrfs space-info ioctl can corrupt kernel heap memory; a crash is established, while additional impact remains unspecified.

CVSS severity7.0
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Linux Kernel 2.6.37 allows local users to crash the system through a crafted Btrfs space-info slot count. The btrfs_ioctl_space_info function compares the caller-controlled unsigned 64-bit space_slots value as a signed integer, allowing truncation or wraparound in its allocation calculation and then copying more entries than the allocated buffer holds. Any local user able to issue the Btrfs space-info ioctl can corrupt kernel heap memory; a crash is established, while additional impact remains unspecified.

The record

CVE
CVE-2011-0699
Published
Feb 20, 2020
Updated
Aug 6, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.37

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.37

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9NIST NVDAV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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