CVE-2022-48923

Kernel hang via oversized btrfs LZO segment

Published Aug 22, 2024 · Updated Aug 5, 2026

Out-of-bounds write in affected Linux kernels allows attackers to hang reads or fault the kernel via a crafted LZO-compressed btrfs image. copy_compressed_segment trusts a corrupted segment length and passes it to memcpy, which writes beyond the allocated compression buffer. A user or automounter must mount the supplied image and read its compressed extent; the resulting corruption can stall the read or fault the kernel.

CVSS severity8.4
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected Linux kernels allows attackers to hang reads or fault the kernel via a crafted LZO-compressed btrfs image. copy_compressed_segment trusts a corrupted segment length and passes it to memcpy, which writes beyond the allocated compression buffer. A user or automounter must mount the supplied image and read its compressed extent; the resulting corruption can stall the read or fault the kernel.

The record

CVE
CVE-2022-48923
Published
Aug 22, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 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=5.15
  2. Affected versionversion=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <741b23a970a79d5d3a1db2d64fa2c7b375a4febb
  3. Affected versionversion=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <8df508b7a44cd8110c726057cd28e8f8116885eb
  4. Affected versionversion=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <e326bd06cdde46df952361456232022298281d16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <741b23a970a79d5d3a1db2d64fa2c7b375a4febb; version=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <8df508b7a44cd8110c726057cd28e8f8116885eb; version=a6e66e6f8c1b685e11b778bef614480a9c1a5278 <e326bd06cdde46df952361456232022298281d16

Published CVSS scores

8.4Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

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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