CVE-2022-49339

Kernel panic via freed initialization symbol

Published Feb 26, 2025 · Updated May 11, 2026

Use-after-free in Linux kernel IPv6 segment-routing HMAC code from 4.10 allows local users to trigger a kernel panic through a module call. The exported seg6_hmac_init symbol remains initialization-annotated after its .init.text storage is freed, so a later module call accesses released kernel code. Reachability requires a module to invoke that symbol after initialization; successful triggering panics the kernel without reported code execution or data access.

CVSS severity5.5
Medium
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 IPv6 segment-routing HMAC code from 4.10 allows local users to trigger a kernel panic through a module call. The exported seg6_hmac_init symbol remains initialization-annotated after its .init.text storage is freed, so a later module call accesses released kernel code. Reachability requires a module to invoke that symbol after initialization; successful triggering panics the kernel without reported code execution or data access.

The record

CVE
CVE-2022-49339
Published
Feb 26, 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. 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=4.10
  2. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <1084716f76c8045eadf92a9d9a62641f3c8d8c90
  3. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <317260b3eb6384a05a8af212308fa50f3b2e8290
  4. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <3e6de5037148c5a93a436b1e8d2edad3dac11755
  5. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <5801f064e35181c71857a80ff18af4dbec3c5f5c
  6. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <5d9c1b081ad28c852a97e10dd75412546497694a
  7. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <64aef8efe96c1616142c4476a05731306fc4494e
  8. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <9ba4416b831eeb4d185e88e73488d1d21288e63a
  9. Affected versionversion=bf355b8d2c30a289232042cacc1cfaea4923936c <ab8b2c2de273ec1d698a18e399896a6febb5cda0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=bf355b8d2c30a289232042cacc1cfaea4923936c <1084716f76c8045eadf92a9d9a62641f3c8d8c90; version=bf355b8d2c30a289232042cacc1cfaea4923936c <317260b3eb6384a05a8af212308fa50f3b2e8290; version=bf355b8d2c30a289232042cacc1cfaea4923936c <3e6de5037148c5a93a436b1e8d2edad3dac11755; version=bf355b8d2c30a289232042cacc1cfaea4923936c <5801f064e35181c71857a80ff18af4dbec3c5f5c; version=bf355b8d2c30a289232042cacc1cfaea4923936c <5d9c1b081ad28c852a97e10dd75412546497694a; version=bf355b8d2c30a289232042cacc1cfaea4923936c <64aef8efe96c1616142c4476a05731306fc4494e; version=bf355b8d2c30a289232042cacc1cfaea4923936c <9ba4416b831eeb4d185e88e73488d1d21288e63a; version=bf355b8d2c30a289232042cacc1cfaea4923936c <ab8b2c2de273ec1d698a18e399896a6febb5cda0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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.

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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

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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