CVE-2022-49770Network attack vector

Kernel compromise or crash via snaprealm double release

Published May 1, 2025 · Updated Aug 15, 2026

Use-after-free in the CephFS snapshot decoder in affected Linux kernels allows remote attackers to compromise or crash the client kernel. In ceph_update_snap_trace(), a later snap-record decode failure can leave first_realm and realm referencing one object, causing the error path to release that snaprealm twice while other references remain. Exploitation requires an already-mounted CephFS and a malicious, compromised, or on-path MDS able to send a crafted multi-realm snap trace; consequences include heap corruption, a kernel panic, or a hang requiring reboot.

CVSS severity7.8
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the CephFS snapshot decoder in affected Linux kernels allows remote attackers to compromise or crash the client kernel. In ceph_update_snap_trace(), a later snap-record decode failure can leave first_realm and realm referencing one object, causing the error path to release that snaprealm twice while other references remain. Exploitation requires an already-mounted CephFS and a malicious, compromised, or on-path MDS able to send a crafted multi-realm snap trace; consequences include heap corruption, a kernel panic, or a hang requiring reboot.

The record

CVE
CVE-2022-49770
Published
May 1, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.0
  2. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <044bc6d3c2c0e9090b0841e7b723875756534b45
  3. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <274e4c79a3a2a24fba7cfe0e41113f1138785c37
  4. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <2f6e2de3a5289004650118b61f138fe7c28e1905
  5. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <51884d153f7ec85e18d607b2467820a90e0f4359
  6. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <cb7495fe957526555782ce0723f79ce92a6db22e
  7. Affected versionversion=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <fd879c83e87735ab8f00ef7755752cf0cbae24b2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <044bc6d3c2c0e9090b0841e7b723875756534b45; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <274e4c79a3a2a24fba7cfe0e41113f1138785c37; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <2f6e2de3a5289004650118b61f138fe7c28e1905; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <51884d153f7ec85e18d607b2467820a90e0f4359; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <cb7495fe957526555782ce0723f79ce92a6db22e; version=982d6011bc30a26e8a3d546e0e7fc7db2c255d85 <fd879c83e87735ab8f00ef7755752cf0cbae24b2

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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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