CVE-2022-49198

Kernel crash via uncleared MPTCP skb anchor

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 5.16 before 5.16.19 and 5.17 before 5.17.2 allows local users to crash the kernel under MPTCP memory pressure. On an allocation failure, __mptcp_alloc_tx_skb frees an skb without first cleaning tcp_tsorted_anchor, leaving the overlapping _skb_refdst value non-null so kfree_skb releases an invalid destination reference. An MPTCP workload and memory pressure must make sk_wmem_schedule fail; the resulting invalid page execution stops the affected host.

CVSS severity5.5
Medium
EPSS probability0.26%
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 5.16 before 5.16.19 and 5.17 before 5.17.2 allows local users to crash the kernel under MPTCP memory pressure. On an allocation failure, __mptcp_alloc_tx_skb frees an skb without first cleaning tcp_tsorted_anchor, leaving the overlapping _skb_refdst value non-null so kfree_skb releases an invalid destination reference. An MPTCP workload and memory pressure must make sk_wmem_schedule fail; the resulting invalid page execution stops the affected host.

The record

CVE
CVE-2022-49198
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

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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=289f2f58266777f45a52cd55dea96d736e6244c9 <af61a8f7603926c26158153d0a0755764d82657c
  2. Affected versionversion=5.16
  3. Affected versionversion=f70cad1085d1e01d3ec73c1078405f906237feee <3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc
  4. Affected versionversion=f70cad1085d1e01d3ec73c1078405f906237feee <4d54181eba4b077fb74033a7186898ad4000a7a5
  5. Affected versionversion=f70cad1085d1e01d3ec73c1078405f906237feee <752add6f5ce5305e55d8bda4ac8d69be3a09f14d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=289f2f58266777f45a52cd55dea96d736e6244c9 <af61a8f7603926c26158153d0a0755764d82657c; version=5.16; version=f70cad1085d1e01d3ec73c1078405f906237feee <3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc; version=f70cad1085d1e01d3ec73c1078405f906237feee <4d54181eba4b077fb74033a7186898ad4000a7a5; version=f70cad1085d1e01d3ec73c1078405f906237feee <752add6f5ce5305e55d8bda4ac8d69be3a09f14d

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.

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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