CVE-2022-49975Public exploit

Kernel crash via zero-length BPF packet redirect

Published Jun 18, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel allows local users to crash the kernel through a privileged zero-length BPF packet redirect. bpf_prog_test_run_skb() forwards an empty skb without validating its modified pkt_len, leaving fq_codel_drop() to dereference a null flow head. The path requires CAP_BPF or CAP_SYS_ADMIN in the initial user namespace, and successful exploitation interrupts the host by crashing its kernel.

CVSS severity7.8
High
EPSS probability0.24%
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 kernel through a privileged zero-length BPF packet redirect. bpf_prog_test_run_skb() forwards an empty skb without validating its modified pkt_len, leaving fq_codel_drop() to dereference a null flow head. The path requires CAP_BPF or CAP_SYS_ADMIN in the initial user namespace, and successful exploitation interrupts the host by crashing its kernel.

The record

CVE
CVE-2022-49975
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 18, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.9
  2. Affected versionversion=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <6204bf78b2a903b96ba43afff6abc0b04d6e0462
  3. Affected versionversion=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <72f2dc8993f10262092745a88cb2dd0fef094f23
  4. Affected versionversion=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <8b68e53d56697a59b5c53893b53f508bbdf272a0
  5. Affected versionversion=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <a75987714bd2d8e59840667a28e15c1fa5c47554
  6. Affected versionversion=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <fd1894224407c484f652ad456e1ce423e89bb3eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <6204bf78b2a903b96ba43afff6abc0b04d6e0462; version=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <72f2dc8993f10262092745a88cb2dd0fef094f23; version=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <8b68e53d56697a59b5c53893b53f508bbdf272a0; version=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <a75987714bd2d8e59840667a28e15c1fa5c47554; version=5293efe62df81908f2e90c9820c7edcc8e61f5e9 <fd1894224407c484f652ad456e1ce423e89bb3eb

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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