CVE-2022-49973

Local system crash via scatterlist boundary mischeck

Published Jun 18, 2025 · Updated May 23, 2026

NULL pointer dereference in Linux kernel 5.19.3 through 5.19.7 allows local users to crash the system through sockmap receive handling. In sk_msg_recvmsg(), sg_is_last() checks an unmarked scatterlist in sockmap redirection, so iteration passes sg.end and dereferences a null pointer. A low-privileged local account must reach the BPF sockmap receive path; successful triggering interrupts the host without reading or modifying data.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel 5.19.3 through 5.19.7 allows local users to crash the system through sockmap receive handling. In sk_msg_recvmsg(), sg_is_last() checks an unmarked scatterlist in sockmap redirection, so iteration passes sg.end and dereferences a null pointer. A low-privileged local account must reach the BPF sockmap receive path; successful triggering interrupts the host without reading or modifying data.

The record

CVE
CVE-2022-49973
Published
Jun 18, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=1295dae30f30c3daa03005ed8958d44b17f037fd <10ee118a1756141f8e9c87aa7344ed12b41630a8
  2. Affected versionversion=293c53b7dbf9073cbcc488f938bc053ff4caeec0 <de22cba333d8699ad77e79f862fe1320cb1284de
  3. Affected versionversion=4674c0da448b546e390a981b819cd4af5cb16cf9
  4. Affected versionversion=5.15.61 <5.15.66
  5. Affected versionversion=5.18.18 <5.19
  6. Affected versionversion=5.19.2 <5.19.8
  7. Affected versionversion=9974d37ea75f01b47d16072b5dad305bd8d23fcc <583585e48d965338e73e1eb383768d16e0922d73

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1295dae30f30c3daa03005ed8958d44b17f037fd <10ee118a1756141f8e9c87aa7344ed12b41630a8; version=293c53b7dbf9073cbcc488f938bc053ff4caeec0 <de22cba333d8699ad77e79f862fe1320cb1284de; version=4674c0da448b546e390a981b819cd4af5cb16cf9; version=5.15.61 <5.15.66; version=5.18.18 <5.19; version=5.19.2 <5.19.8; version=9974d37ea75f01b47d16072b5dad305bd8d23fcc <583585e48d965338e73e1eb383768d16e0922d73

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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

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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-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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