CVE-2022-49149Network attack vector

Kernel crash via RxRPC call-timer use-after-free

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel's RxRPC call timer allows remote attackers to crash the kernel through a call teardown race. Packet-input code can call rxrpc_reduce_call_timer while holding only an RCU read lock, so it can restart a stopped timer after rxrpc_call destruction begins without first acquiring a reference. When an RxRPC endpoint processes a late call-bound packet during teardown, timer dispatch can dereference the freed call and trigger a kernel oops.

CVSS severity9.8
Critical
EPSS probability0.47%
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 Linux kernel's RxRPC call timer allows remote attackers to crash the kernel through a call teardown race. Packet-input code can call rxrpc_reduce_call_timer while holding only an RCU read lock, so it can restart a stopped timer after rxrpc_call destruction begins without first acquiring a reference. When an RxRPC endpoint processes a late call-bound packet during teardown, timer dispatch can dereference the freed call and trigger a kernel oops.

The record

CVE
CVE-2022-49149
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
network
Privileges
unauthenticated

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=4.15
  2. Affected versionversion=a158bdd3247b9656df36ba133235fff702e9fdc3 <051360e51341cd17738d82c15a8226010c7cb7f6
  3. Affected versionversion=a158bdd3247b9656df36ba133235fff702e9fdc3 <4a7f62f91933c8ae5308f9127fd8ea48188b6bc3
  4. Affected versionversion=a158bdd3247b9656df36ba133235fff702e9fdc3 <54df5a37f1d951ed27fd47bf9b15a42279582110
  5. Affected versionversion=a158bdd3247b9656df36ba133235fff702e9fdc3 <5e3c11144e557a9dbf9a2f6abe444689ef9d8aae
  6. Affected versionversion=a158bdd3247b9656df36ba133235fff702e9fdc3 <8cbf4ae7a2833767d63114573e5f9a45740cc975

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=a158bdd3247b9656df36ba133235fff702e9fdc3 <051360e51341cd17738d82c15a8226010c7cb7f6; version=a158bdd3247b9656df36ba133235fff702e9fdc3 <4a7f62f91933c8ae5308f9127fd8ea48188b6bc3; version=a158bdd3247b9656df36ba133235fff702e9fdc3 <54df5a37f1d951ed27fd47bf9b15a42279582110; version=a158bdd3247b9656df36ba133235fff702e9fdc3 <5e3c11144e557a9dbf9a2f6abe444689ef9d8aae; version=a158bdd3247b9656df36ba133235fff702e9fdc3 <8cbf4ae7a2833767d63114573e5f9a45740cc975

Published CVSS scores

9.8Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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