CVE-2022-49699

Local system crash via filemap sibling-entry race

Published Feb 26, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux kernel 5.12 through 5.18.7 allows local users to crash the system through a file-read race. In filemap_get_read_batch() in mm/filemap.c, invalidation can replace a folio with a higher-order folio, but the next loop iteration treats the resulting sibling entry as a folio and dereferences a NULL pointer while holding the RCU read lock. Low-privileged local access is required, and a successful race interrupts the entire host rather than disclosing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel 5.12 through 5.18.7 allows local users to crash the system through a file-read race. In filemap_get_read_batch() in mm/filemap.c, invalidation can replace a folio with a higher-order folio, but the next loop iteration treats the resulting sibling entry as a folio and dereferences a NULL pointer while holding the RCU read lock. Low-privileged local access is required, and a successful race interrupts the entire host rather than disclosing or modifying data.

The record

CVE
CVE-2022-49699
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=5.12
  2. Affected versionversion=cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 <a66f131d30e53000f08301776bf85c912ef47aad
  3. Affected versionversion=cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 <cb995f4eeba9d268fd4b56c2423ad6c1d1ea1b82

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 <a66f131d30e53000f08301776bf85c912ef47aad; version=cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 <cb995f4eeba9d268fd4b56c2423ad6c1d1ea1b82

Published CVSS scores

5.5NIST NVDCVSS: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

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-476NULL Pointer Dereference
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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