CVE-2022-50253

Kernel denial of service via zero-length skb redirection

Published Sep 15, 2025 · Updated Sep 15, 2025

Denial of service in Linux kernel BPF redirection allows local users to interrupt the system by redirecting a packet to a tunneling device. The clone-redirect path strips the Ethernet header with __skb_pull, then passes a zero-length skb to __dev_queue_xmit without rejecting it. Low-privilege local access is required; the published reproducer worked only under syzkaller, and records do not identify a hang or crash mode.

CVSS severity5.5
Medium
EPSS probability0.16%
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 redirection allows local users to interrupt the system by redirecting a packet to a tunneling device. The clone-redirect path strips the Ethernet header with __skb_pull, then passes a zero-length skb to __dev_queue_xmit without rejecting it. Low-privilege local access is required; the published reproducer worked only under syzkaller, and records do not identify a hang or crash mode.

The record

CVE
CVE-2022-50253
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <07ec7b502800ba9f7b8b15cb01dd6556bb41aaca
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1b65704b8c08ae92db29f720d3b298031131da53
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d935a02658be82585ecb39aab339faa84496650
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <772431f30ca040cfbf31b791d468bac6a9ca74d3
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6a63203e5a90a39392fa1a7ffc60f5e9baf642a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f186303845a01cc7e991f9dc51d7e5a3cdc7aedb
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffbccc5fb0a67424e12f7f8da210c04c8063f797

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <07ec7b502800ba9f7b8b15cb01dd6556bb41aaca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1b65704b8c08ae92db29f720d3b298031131da53; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d935a02658be82585ecb39aab339faa84496650; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <772431f30ca040cfbf31b791d468bac6a9ca74d3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6a63203e5a90a39392fa1a7ffc60f5e9baf642a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f186303845a01cc7e991f9dc51d7e5a3cdc7aedb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffbccc5fb0a67424e12f7f8da210c04c8063f797

Published CVSS scores

5.5Canonical UbuntuCVSS: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.

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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