CVE-2022-48939

Kernel hang via unscheduled BPF batch loops

Published Aug 22, 2024 · Updated May 11, 2026

Denial of service in Linux kernel BPF batch operations from 5.6 allows local users to cause soft lockups by processing huge maps. Batch loops in kernel/bpf/syscall.c process arbitrarily many map elements without scheduling points, monopolizing CPU time and blocking RCU work. A local user must be able to invoke BPF map batch operations; the bounded impact is a kernel hang or severe host unresponsiveness.

CVSS severity3.3
Low
EPSS probability0.20%
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 Linux kernel BPF batch operations from 5.6 allows local users to cause soft lockups by processing huge maps. Batch loops in kernel/bpf/syscall.c process arbitrarily many map elements without scheduling points, monopolizing CPU time and blocking RCU work. A local user must be able to invoke BPF map batch operations; the bounded impact is a kernel hang or severe host unresponsiveness.

The record

CVE
CVE-2022-48939
Published
Aug 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE 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=5.6
  2. Affected versionversion=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <75134f16e7dd0007aa474b281935c5f42e79f2c8
  3. Affected versionversion=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <7e8099967d0e3ff9d1ae043e80b27fbe46c08417
  4. Affected versionversion=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b
  5. Affected versionversion=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <8628f489b749a4f9767991631921dbe3fbcdc784

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <75134f16e7dd0007aa474b281935c5f42e79f2c8; version=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <7e8099967d0e3ff9d1ae043e80b27fbe46c08417; version=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b; version=cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 <8628f489b749a4f9767991631921dbe3fbcdc784

Published CVSS scores

3.3UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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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