CVE-2022-50697

Kernel crash or privilege escalation via MRP timer

Published Dec 24, 2025 · Updated Dec 24, 2025

Use-after-free in Linux kernel MRP allows local users to crash the host or potentially gain kernel privileges through VLAN teardown. The MRP applicant teardown path cancels a periodic timer without blocking its callback from rearming, so the timer later writes through a freed mrp_applicant object. A local user with CAP_NET_ADMIN, including through an enabled unprivileged user namespace, can repeatedly create and delete VLAN interfaces to drive the race; a successful trigger can crash the kernel or enable same-host privilege escalation.

CVSS severity7.8
High
EPSS probability0.15%
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 MRP allows local users to crash the host or potentially gain kernel privileges through VLAN teardown. The MRP applicant teardown path cancels a periodic timer without blocking its callback from rearming, so the timer later writes through a freed mrp_applicant object. A local user with CAP_NET_ADMIN, including through an enabled unprivileged user namespace, can repeatedly create and delete VLAN interfaces to drive the race; a successful trigger can crash the kernel or enable same-host privilege escalation.

The record

CVE
CVE-2022-50697
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <563e45fd5046045cc194af3ba17f5423e1c98170
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d5a481a7fd0234f617535dc464ea010804a1129
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <755eb0879224ffc2a43de724554aeaf0e51e5a64
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78d48bc41f7726113c9f114268d3ab11212814da
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98f53e591940e4c3818be358c5dc684d5b30cb56
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aadb1507a77b060c529edfeaf67f803e31461f24
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab0377803dafc58f1e22296708c1c28e309414d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <563e45fd5046045cc194af3ba17f5423e1c98170; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d5a481a7fd0234f617535dc464ea010804a1129; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <755eb0879224ffc2a43de724554aeaf0e51e5a64; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78d48bc41f7726113c9f114268d3ab11212814da; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98f53e591940e4c3818be358c5dc684d5b30cb56; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aadb1507a77b060c529edfeaf67f803e31461f24; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab0377803dafc58f1e22296708c1c28e309414d6

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3UbuntuCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.3SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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