CVE-2024-26792

Kernel state corruption via Btrfs snapshot double free

Published Apr 4, 2024 · Updated Aug 5, 2026

Double free in Btrfs in the Linux kernel allows local users to corrupt anonymous-device allocator state through snapshot creation. During a failed transaction commit, btrfs_get_new_fs_root() frees pending_snapshot->anon_dev without clearing it, and create_snapshot() then frees the same identifier again. Reaching the flaw requires write and execute permission on an owned directory and a locally mounted Btrfs filesystem; the corrupted global ID allocator can alias live filesystems or trigger a kernel panic under panic_on_warn.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Btrfs in the Linux kernel allows local users to corrupt anonymous-device allocator state through snapshot creation. During a failed transaction commit, btrfs_get_new_fs_root() frees pending_snapshot->anon_dev without clearing it, and create_snapshot() then frees the same identifier again. Reaching the flaw requires write and execute permission on an owned directory and a locally mounted Btrfs filesystem; the corrupted global ID allocator can alias live filesystems or trigger a kernel panic under panic_on_warn.

The record

CVE
CVE-2024-26792
Published
Apr 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3f5d47eb163bceb1b9e613c9003bae5fefc0046f
  2. Affected versionversion=5.10.210 <5.11
  3. Affected versionversion=5.15.149 <5.16
  4. Affected versionversion=5a172344bfdabb46458e03708735d7b1a918c468 <c8ab7521665bd0f8bc4a900244d1d5a7095cc3b9
  5. Affected versionversion=6.1.79 <6.1.81
  6. Affected versionversion=6.6.18 <6.6.21
  7. Affected versionversion=66b317a2fc45b2ef66527ee3f8fa08fb5beab88d <c34adc20b91a8e55e048b18d63f4f4ae003ecf8f
  8. Affected versionversion=6.7.6 <6.7.9
  9. Affected versionversion=833775656d447c545133a744a0ed1e189ce61430 <eb3441093aad251418921246fc3b224fd1575701
  10. Affected versionversion=e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb <e2b54eaf28df0c978626c9736b94f003b523b451
  11. Affected versionversion=e31546b0f34af21738c4ceac47d662c00ee6382f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3f5d47eb163bceb1b9e613c9003bae5fefc0046f; version=5.10.210 <5.11; version=5.15.149 <5.16; version=5a172344bfdabb46458e03708735d7b1a918c468 <c8ab7521665bd0f8bc4a900244d1d5a7095cc3b9; version=6.1.79 <6.1.81; version=6.6.18 <6.6.21; version=66b317a2fc45b2ef66527ee3f8fa08fb5beab88d <c34adc20b91a8e55e048b18d63f4f4ae003ecf8f; version=6.7.6 <6.7.9; version=833775656d447c545133a744a0ed1e189ce61430 <eb3441093aad251418921246fc3b224fd1575701; version=e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb <e2b54eaf28df0c978626c9736b94f003b523b451; version=e31546b0f34af21738c4ceac47d662c00ee6382f

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-415Double Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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