CVE-2022-49688

Local kernel crash via AFS NULL dereference

Published Feb 26, 2025 · Updated May 23, 2026

NULL pointer dereference in affected Linux kernel AFS releases allows local users to crash the kernel by stating a directory in /afs. afs_getattr follows vnode->volume for dynamic-root pseudo-inodes even though those inodes have no volume or server pointer. The AFS dynamic-root superblock must be mounted; an unprivileged stat or ls operation then causes a kernel oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.30%
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 affected Linux kernel AFS releases allows local users to crash the kernel by stating a directory in /afs. afs_getattr follows vnode->volume for dynamic-root pseudo-inodes even though those inodes have no volume or server pointer. The AFS dynamic-root superblock must be mounted; an unprivileged stat or ls operation then causes a kernel oops and service interruption.

The record

CVE
CVE-2022-49688
Published
Feb 26, 2025
Updated
May 23, 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 23, 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=2aeb8c86d49967552394d5e723f87454cb53f501 <7844ceada44eca740d31beb3d97b8511b1ca0a9b
  2. Affected versionversion=2aeb8c86d49967552394d5e723f87454cb53f501 <cb78d1b5efffe4cf97e16766329dd7358aed3deb
  3. Affected versionversion=4.19.245 <4.19.250
  4. Affected versionversion=5.10.118 <5.10.127
  5. Affected versionversion=5.15.42 <5.15.51
  6. Affected versionversion=5.17.10 <5.18
  7. Affected versionversion=5.18
  8. Affected versionversion=5.4.196 <5.4.202
  9. Affected versionversion=61a4cc41e5c1b77d05a12798f8032050aa75f3c8 <7b564e3254b7db5fbfbf11a824627a6c31b932b4
  10. Affected versionversion=94bf8bfb009fad247d02f12e4c443411c8445412 <2b2bba96526f25f2eba74ecadb031de2e05a83ce
  11. Affected versionversion=9e655a8b874d7c56e02938ddb221b16e293793df
  12. Affected versionversion=b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 <65c24caf1b9f5b08397c6e805ec24ebc390c6e4d
  13. Affected versionversion=dba1941f5bc3de6b460685155b89ae1182824fc8 <e3a232e5767051483ffad4cef7d0a89d292a192b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2aeb8c86d49967552394d5e723f87454cb53f501 <7844ceada44eca740d31beb3d97b8511b1ca0a9b; version=2aeb8c86d49967552394d5e723f87454cb53f501 <cb78d1b5efffe4cf97e16766329dd7358aed3deb; version=4.19.245 <4.19.250; version=5.10.118 <5.10.127; version=5.15.42 <5.15.51; version=5.17.10 <5.18; version=5.18; version=5.4.196 <5.4.202; version=61a4cc41e5c1b77d05a12798f8032050aa75f3c8 <7b564e3254b7db5fbfbf11a824627a6c31b932b4; version=94bf8bfb009fad247d02f12e4c443411c8445412 <2b2bba96526f25f2eba74ecadb031de2e05a83ce; version=9e655a8b874d7c56e02938ddb221b16e293793df; version=b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 <65c24caf1b9f5b08397c6e805ec24ebc390c6e4d; version=dba1941f5bc3de6b460685155b89ae1182824fc8 <e3a232e5767051483ffad4cef7d0a89d292a192b

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 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

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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