CVE-2022-49093Network attack vector

Kernel memory corruption via recycled fragment coalescing

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel skbuff coalescing allows remote attackers to corrupt kernel memory through crafted TCP traffic. skb_try_coalesce takes a normal page reference for a cloned, page-pool-recycled fragment instead of increasing pp_frag_count, so later releases underflow the fragment count and free a page still owned by an RX descriptor. Reachability requires a page-pool-fragment NIC and an skb clone from an AF_PACKET or monitoring tap; the result is an IOMMU fault or silent memory corruption when the IOMMU is disabled.

CVSS severity9.8
Critical
EPSS probability0.62%
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 Linux kernel skbuff coalescing allows remote attackers to corrupt kernel memory through crafted TCP traffic. skb_try_coalesce takes a normal page reference for a cloned, page-pool-recycled fragment instead of increasing pp_frag_count, so later releases underflow the fragment count and free a page still owned by an RX descriptor. Reachability requires a page-pool-fragment NIC and an skb clone from an AF_PACKET or monitoring tap; the result is an IOMMU fault or silent memory corruption when the IOMMU is disabled.

The record

CVE
CVE-2022-49093
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1210
Attack vector
network
Privileges
unauthenticated

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=5.15
  2. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <1effe8ca4e34c34cdd9318436a4232dcb582ebf4
  3. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <72bb856d16e883437023ff2ff77d0c498018728a
  4. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <ba965e8605aee5387cecaa28fcf7ee9f61779a49
  5. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <c4fa19615806a9a7e518c295b39175aa47a685ac

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <1effe8ca4e34c34cdd9318436a4232dcb582ebf4; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <72bb856d16e883437023ff2ff77d0c498018728a; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <ba965e8605aee5387cecaa28fcf7ee9f61779a49; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <c4fa19615806a9a7e518c295b39175aa47a685ac

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

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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