CVE-2022-49593

System crash via unsynchronized TCP probe interval read

Published Feb 26, 2025 · Updated May 11, 2026

A race condition in the Linux kernel allows local users to crash the system through concurrent access to a TCP probe interval sysctl. The tcp_mtu_check_reprobe function reads net->ipv4.sysctl_tcp_probe_interval without READ_ONCE while that value can change concurrently. Exploitation requires low-privileged local access and precise timing; the reported consequence is availability loss without data disclosure or modification.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux kernel allows local users to crash the system through concurrent access to a TCP probe interval sysctl. The tcp_mtu_check_reprobe function reads net->ipv4.sysctl_tcp_probe_interval without READ_ONCE while that value can change concurrently. Exploitation requires low-privileged local access and precise timing; the reported consequence is availability loss without data disclosure or modification.

The record

CVE
CVE-2022-49593
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, 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=05cbc0db03e82128f2e7e353d4194dd24a1627fe <2a85388f1d94a9f8b5a529118a2c5eaa0520d85c
  2. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <73a11588751a2c13f25d9da8117efc9a79b1843f
  3. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <80dabd089086e6553b7acfcff2ec223bdada87a1
  4. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <b14cc8afbbcbc6dce4797913c0b85266b897f541
  5. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <b3798d3519eda9c409bb0815b0102f27ec42468d
  6. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <c61aede097d350d890fa1edc9521b0072e14a0b8
  7. Affected versionversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <e6b6f027e2854a51f345a5e3e808d7a88001d4f8
  8. Affected versionversion=4.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=05cbc0db03e82128f2e7e353d4194dd24a1627fe <2a85388f1d94a9f8b5a529118a2c5eaa0520d85c; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <73a11588751a2c13f25d9da8117efc9a79b1843f; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <80dabd089086e6553b7acfcff2ec223bdada87a1; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <b14cc8afbbcbc6dce4797913c0b85266b897f541; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <b3798d3519eda9c409bb0815b0102f27ec42468d; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <c61aede097d350d890fa1edc9521b0072e14a0b8; version=05cbc0db03e82128f2e7e353d4194dd24a1627fe <e6b6f027e2854a51f345a5e3e808d7a88001d4f8; version=4.1

Published CVSS scores

4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CISA-ADPCVSS:3.1/AV:L/AC:H/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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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