CVE-2022-49085

Kernel memory corruption via freed state-query buffer

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel DRBD allows local users to trigger memory corruption through generic-netlink state queries. If genlmsg_put fails, notification code frees the socket buffer but get_initial_state later reads skb->len; four related notification paths repeat the stale-buffer use. Local access and failed message construction are required, and the resulting kernel memory corruption can crash the host.

CVSS severity7.8
High
EPSS probability0.28%
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 Linux kernel DRBD allows local users to trigger memory corruption through generic-netlink state queries. If genlmsg_put fails, notification code frees the socket buffer but get_initial_state later reads skb->len; four related notification paths repeat the stale-buffer use. Local access and failed message construction are required, and the resulting kernel memory corruption can crash the host.

The record

CVE
CVE-2022-49085
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, 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=4.5
  2. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <0489700bfeb1e53eb2039c2291c67e71b0b40103
  3. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <188fe6b26765edbad4055611c0f788b6870f4024
  4. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <226e993c39405292781bfcf4b039a8db56aab362
  5. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <594205b4936771a250f9d141e7e0fff21c3dd2d9
  6. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <a972c768723359ec995579902473028fe3cd64b1
  7. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <aadb22ba2f656581b2f733deb3a467c48cc618f6
  8. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <b6a4055036eed1f5e239ce3d8b0db1ce38bba447
  9. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <dcf6be17b5c53b741898d2223b23e66d682de300
  10. Affected versionversion=a29728463b254ce81ecefdf20c1a02e01d9361da <de63e74da2333b4068bb79983e632db730fea97e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=a29728463b254ce81ecefdf20c1a02e01d9361da <0489700bfeb1e53eb2039c2291c67e71b0b40103; version=a29728463b254ce81ecefdf20c1a02e01d9361da <188fe6b26765edbad4055611c0f788b6870f4024; version=a29728463b254ce81ecefdf20c1a02e01d9361da <226e993c39405292781bfcf4b039a8db56aab362; version=a29728463b254ce81ecefdf20c1a02e01d9361da <594205b4936771a250f9d141e7e0fff21c3dd2d9; version=a29728463b254ce81ecefdf20c1a02e01d9361da <a972c768723359ec995579902473028fe3cd64b1; version=a29728463b254ce81ecefdf20c1a02e01d9361da <aadb22ba2f656581b2f733deb3a467c48cc618f6; version=a29728463b254ce81ecefdf20c1a02e01d9361da <b6a4055036eed1f5e239ce3d8b0db1ce38bba447; version=a29728463b254ce81ecefdf20c1a02e01d9361da <dcf6be17b5c53b741898d2223b23e66d682de300; version=a29728463b254ce81ecefdf20c1a02e01d9361da <de63e74da2333b4068bb79983e632db730fea97e

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.

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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-416Use After Free
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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