CVE-2022-48976

Service interruption via non-atomic per-CPU increment

Published Oct 21, 2024 · Updated May 23, 2026

Availability flaw in Linux kernel 5.15.157 through 5.15.x and 6.0 allows local users to interrupt service during netfilter flow-table cleanup. flow_offload_queue_work() can run in a preemptible workqueue context, but NF_FLOW_TABLE_STAT_INC() performs a non-atomic per-CPU increment that triggers a kernel BUG warning. Reaching the fault requires local low-privilege access and the affected act_ct flow-table cleanup path; panic-on-warning or panic-on-oops settings can turn the warning into a system panic.

CVSS severity5.5
Medium
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

Availability flaw in Linux kernel 5.15.157 through 5.15.x and 6.0 allows local users to interrupt service during netfilter flow-table cleanup. flow_offload_queue_work() can run in a preemptible workqueue context, but NF_FLOW_TABLE_STAT_INC() performs a non-atomic per-CPU increment that triggers a kernel BUG warning. Reaching the fault requires local low-privilege access and the affected act_ct flow-table cleanup path; panic-on-warning or panic-on-oops settings can turn the warning into a system panic.

The record

CVE
CVE-2022-48976
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.15.157 <5.16
  2. Affected versionversion=5345d78ae64d5a760c211cd2da995dc71c5b29e4
  3. Affected versionversion=6.0
  4. Affected versionversion=b038177636f83bbf87c2b238706474145dd2cd04 <a220a11fda012fba506b35929672374c2723ae6d
  5. Affected versionversion=b038177636f83bbf87c2b238706474145dd2cd04 <a81047154e7ce4eb8769d5d21adcbc9693542a79

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.157 <5.16; version=5345d78ae64d5a760c211cd2da995dc71c5b29e4; version=6.0; version=b038177636f83bbf87c2b238706474145dd2cd04 <a220a11fda012fba506b35929672374c2723ae6d; version=b038177636f83bbf87c2b238706474145dd2cd04 <a81047154e7ce4eb8769d5d21adcbc9693542a79

Published CVSS scores

5.5NIST NVDCVSS: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

T1499Endpoint Denial of Service

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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