CVE-2022-49096

Kernel crash via stale XDP queue pointers

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel sfc network driver allows local users to crash the kernel after changing RX/TX ring sizes. The ring-resize path reallocates sfc RX and TX queues but fails to rebuild efx->xdp_tx_queues, leaving stale pointers that XDP_TX or XDP_REDIRECT later dereferences. The path requires CAP_NET_ADMIN access to a Solarflare interface with an attached XDP program; successful triggering produces a kernel panic and service interruption.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel sfc network driver allows local users to crash the kernel after changing RX/TX ring sizes. The ring-resize path reallocates sfc RX and TX queues but fails to rebuild efx->xdp_tx_queues, leaving stale pointers that XDP_TX or XDP_REDIRECT later dereferences. The path requires CAP_NET_ADMIN access to a Solarflare interface with an attached XDP program; successful triggering produces a kernel panic and service interruption.

The record

CVE
CVE-2022-49096
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=3990a8fffbdad5765f47ea593f9de66c91762059 <059a47f1da93811d37533556d67e72f2261b1127
  2. Affected versionversion=3990a8fffbdad5765f47ea593f9de66c91762059 <b8c46bc358d84701e7f7ffa054037db25f25da0e
  3. Affected versionversion=3990a8fffbdad5765f47ea593f9de66c91762059 <dcc85e1593686e42c6749ef3d356db34759d59e8
  4. Affected versionversion=3990a8fffbdad5765f47ea593f9de66c91762059 <ed7a824fda8732578d1014fad1f7fb0363705090
  5. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3990a8fffbdad5765f47ea593f9de66c91762059 <059a47f1da93811d37533556d67e72f2261b1127; version=3990a8fffbdad5765f47ea593f9de66c91762059 <b8c46bc358d84701e7f7ffa054037db25f25da0e; version=3990a8fffbdad5765f47ea593f9de66c91762059 <dcc85e1593686e42c6749ef3d356db34759d59e8; version=3990a8fffbdad5765f47ea593f9de66c91762059 <ed7a824fda8732578d1014fad1f7fb0363705090; version=5.5

Published CVSS scores

8.8Linux Kernel CVE TeamCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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