CVE-2022-49802

Kernel panic via uninitialized ftrace list

Published May 1, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel allows local users to crash the system through an ftrace function-filter control write. When kstrdup() fails while ftrace_add_mod() copies a function or module name, free_ftrace_mod() calls list_del() on an uninitialized list whose links are NULL. Reaching the fault requires write access to ftrace controls and a failed allocation; the resulting NULL-link writes trigger a kernel panic rather than data disclosure or modification.

CVSS severityUnavailable
Unscored
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 the Linux kernel allows local users to crash the system through an ftrace function-filter control write. When kstrdup() fails while ftrace_add_mod() copies a function or module name, free_ftrace_mod() calls list_del() on an uninitialized list whose links are NULL. Reaching the fault requires write access to ftrace controls and a failed allocation; the resulting NULL-link writes trigger a kernel panic rather than data disclosure or modification.

The record

CVE
CVE-2022-49802
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 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=4.13
  2. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0
  3. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <1bea037a1abb23a6729bef36a2265a4565f5ea77
  4. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <665b4c6648bf2b91f69b33817f4321cf4c3cafe9
  5. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <6a14828caddad0d989495a72af678adf60992704
  6. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <6e50eb4b1807017f6c2d5089064256ce2de8aef1
  7. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <b5bfc61f541d3f092b13dedcfe000d86eb8e133c
  8. Affected versionversion=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <f715f31559b82e3f75ce047fa476de63d8107584

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <1bea037a1abb23a6729bef36a2265a4565f5ea77; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <665b4c6648bf2b91f69b33817f4321cf4c3cafe9; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <6a14828caddad0d989495a72af678adf60992704; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <6e50eb4b1807017f6c2d5089064256ce2de8aef1; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <b5bfc61f541d3f092b13dedcfe000d86eb8e133c; version=673feb9d76ab3eddde7acfd94b206e321cfc90b9 <f715f31559b82e3f75ce047fa476de63d8107584

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
PrivilegesUnavailable
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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