CVE-2022-49062

Kernel memory corruption via oversized xattr copy

Published Feb 26, 2025 · Updated Aug 5, 2026

An out-of-bounds write in Linux 5.17 through 5.17.3 allows local users to corrupt kernel memory through CacheFiles volume creation. cachefiles_set_volume_xattr passes the xattr structure size instead of the coherency-data length to memcpy, writing four bytes beyond the allocated buffer. CacheFiles must already be bound and a new FS-Cache-enabled network-filesystem volume created; exploitation can panic the host or corrupt adjacent slab objects for kernel-context control flow.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in Linux 5.17 through 5.17.3 allows local users to corrupt kernel memory through CacheFiles volume creation. cachefiles_set_volume_xattr passes the xattr structure size instead of the coherency-data length to memcpy, writing four bytes beyond the allocated buffer. CacheFiles must already be bound and a new FS-Cache-enabled network-filesystem volume created; exploitation can panic the host or corrupt adjacent slab objects for kernel-context control flow.

The record

CVE
CVE-2022-49062
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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

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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=413a4a6b0b5553f2423d210f65e98c211b99c3f8 <09a5df1b88c8f126c8ff9938edf160edd4e92f42
  2. Affected versionversion=413a4a6b0b5553f2423d210f65e98c211b99c3f8 <7b2f6c306601240635c72caa61f682e74d4591b2
  3. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=413a4a6b0b5553f2423d210f65e98c211b99c3f8 <09a5df1b88c8f126c8ff9938edf160edd4e92f42; version=413a4a6b0b5553f2423d210f65e98c211b99c3f8 <7b2f6c306601240635c72caa61f682e74d4591b2; version=5.17

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499Endpoint Denial of Service
T1068Exploitation for Privilege Escalation

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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