CVE-2022-49815

Kernel crash via unchecked xarray retry entry

Published May 1, 2025 · Updated May 11, 2026

Denial of service in Linux kernel EROFS 5.19 through 6.0.9 allows local users to crash the kernel through fscache activity. In fs/erofs/fscache.c, erofs_fscache_req_complete() iterates an xarray under only an RCU read lock and dereferences XA_RETRY_ENTRY instead of retrying. The flaw requires EROFS fscache mode and concurrent xarray modification; the invalid dereference causes a kernel oops and system-wide service interruption.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel EROFS 5.19 through 6.0.9 allows local users to crash the kernel through fscache activity. In fs/erofs/fscache.c, erofs_fscache_req_complete() iterates an xarray under only an RCU read lock and dereferences XA_RETRY_ENTRY instead of retrying. The flaw requires EROFS fscache mode and concurrent xarray modification; the invalid dereference causes a kernel oops and system-wide service interruption.

The record

CVE
CVE-2022-49815
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.19
  2. Affected versionversion=d435d53228dd039fffecae123b8c138af6f96f99 <37020bbb71d911431e16c2c940b97cf86ae4f2f6
  3. Affected versionversion=d435d53228dd039fffecae123b8c138af6f96f99 <dbc98fe99e17ed18f2f272d5fe880d844b1c68c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=d435d53228dd039fffecae123b8c138af6f96f99 <37020bbb71d911431e16c2c940b97cf86ae4f2f6; version=d435d53228dd039fffecae123b8c138af6f96f99 <dbc98fe99e17ed18f2f272d5fe880d844b1c68c3

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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