CVE-2022-49450

Local kernel crash via oversized AF_RXRPC backlog

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel AF_RXRPC subsystem allows local users to crash the system by closing a socket with backlog 32. The listen handler permits 32 pending calls although its circular preallocation ring can hold only 31, leaving an extra uninitialized call during teardown. Exploitation requires local access, AF_RXRPC use, and a raised maximum-backlog sysctl; closing the socket dereferences the unset call peer and crashes the kernel.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel AF_RXRPC subsystem allows local users to crash the system by closing a socket with backlog 32. The listen handler permits 32 pending calls although its circular preallocation ring can hold only 31, leaving an extra uninitialized call during teardown. Exploitation requires local access, AF_RXRPC use, and a raised maximum-backlog sysctl; closing the socket dereferences the unset call peer and crashes the kernel.

The record

CVE
CVE-2022-49450
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, 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=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <369de57492c4f1a42563c5a3bd365822ca3bfc79
  2. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <4a3a78b7918bdd723d8c7c9786522ca969bffcc4
  3. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <5b4826657d36c218e9f08e8d3223b0edce3de88f
  4. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <616f76498d5ddf26b997caf64a95cda3c8a55533
  5. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <61fb38cfbb1d54d3dafd0c25752f684b3cd00b32
  6. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <88e22159750b0d55793302eeed8ee603f5c1a95c
  7. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <91b34bf0409f43bb60453bab23c5beadd726d022
  8. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <b3a9b227d5e7467b8518160ff034ea22bb9de573
  9. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <e198f1930050e3115c80b67d9249f80f98a27c67
  10. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <369de57492c4f1a42563c5a3bd365822ca3bfc79; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <4a3a78b7918bdd723d8c7c9786522ca969bffcc4; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <5b4826657d36c218e9f08e8d3223b0edce3de88f; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <616f76498d5ddf26b997caf64a95cda3c8a55533; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <61fb38cfbb1d54d3dafd0c25752f684b3cd00b32; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <88e22159750b0d55793302eeed8ee603f5c1a95c; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <91b34bf0409f43bb60453bab23c5beadd726d022; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <b3a9b227d5e7467b8518160ff034ea22bb9de573; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <e198f1930050e3115c80b67d9249f80f98a27c67; version=4.9

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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