CVE-2022-49087

Kernel memory corruption via rearmed RxRPC keepalive timer

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux's RxRPC network namespace teardown allows local users to crash the kernel during namespace cleanup. In rxrpc_exit_net(), the keepalive worker can observe rxnet->live before it is cleared, then rearm peer_keepalive_timer after del_timer_sync() returns and before cancellation completes. Local low-privileged access is required; the resulting timer can outlive the freed network namespace and corrupt kernel memory, causing a host crash or broader kernel compromise.

CVSS severity7.8
High
EPSS probability0.25%
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's RxRPC network namespace teardown allows local users to crash the kernel during namespace cleanup. In rxrpc_exit_net(), the keepalive worker can observe rxnet->live before it is cleared, then rearm peer_keepalive_timer after del_timer_sync() returns and before cancellation completes. Local low-privileged access is required; the resulting timer can outlive the freed network namespace and corrupt kernel memory, causing a host crash or broader kernel compromise.

The record

CVE
CVE-2022-49087
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

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=4.17
  2. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <08ff0e74fab517dbc44e11b8bc683dd4ecc65950
  3. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <1946014ca3b19be9e485e780e862c375c6f98bad
  4. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <41024a40f6c793abbb916a857f18fb009f07464c
  5. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <571d8e1d154ca18f08dcb72b69318d36e10010a0
  6. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <7ee84d29f22de6f6c63fad6c54690517659862f1
  7. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <864297ee30727ae6233f80296b7fc91442620b05
  8. Affected versionversion=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <cd8aef1f30d1215648e4e6686cfb422004851429

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <08ff0e74fab517dbc44e11b8bc683dd4ecc65950; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <1946014ca3b19be9e485e780e862c375c6f98bad; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <41024a40f6c793abbb916a857f18fb009f07464c; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <571d8e1d154ca18f08dcb72b69318d36e10010a0; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <7ee84d29f22de6f6c63fad6c54690517659862f1; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <864297ee30727ae6233f80296b7fc91442620b05; version=ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <cd8aef1f30d1215648e4e6686cfb422004851429

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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