CVE-2023-52885Network attack vector

Kernel use-after-free via stale SUNRPC socket pointer

Published Jul 14, 2024 · Updated Aug 5, 2026

A SUNRPC use-after-free in Linux allows remote attackers to trigger a kernel memory-safety fault with TCP data during NFS server restart. An accepted child socket clones the listener's svc_sock pointer into sk_user_data, and svc_tcp_listen_data_ready dereferences it after the listener is freed. Exploitation requires TCP data to reach the child socket during the listener teardown race; the published reproduction produces a KASAN slab-use-after-free report.

CVSS severity8.1
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A SUNRPC use-after-free in Linux allows remote attackers to trigger a kernel memory-safety fault with TCP data during NFS server restart. An accepted child socket clones the listener's svc_sock pointer into sk_user_data, and svc_tcp_listen_data_ready dereferences it after the listener is freed. Exploitation requires TCP data to reach the child socket during the listener teardown race; the published reproduction produces a KASAN slab-use-after-free report.

The record

CVE
CVE-2023-52885
Published
Jul 14, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2024CVE 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=4.8
  2. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <42725e5c1b181b757ba11d804443922982334d9b
  3. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <7e1f989055622fd086c5dfb291fc72adf5660b6f
  4. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <c7b8c2d06e437639694abe76978e915cfb73f428
  5. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <cd5ec3ee52ce4b7e283cc11facfa420c297c8065
  6. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254
  7. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <ef047411887ff0845afd642d6a687819308e1a4e
  8. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <fbf4ace39b2e4f3833236afbb2336edbafd75eee
  9. Affected versionversion=fa9251afc33c81606d70cfe91800a779096442ec <fc80fc2d4e39137869da3150ee169b40bf879287

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=fa9251afc33c81606d70cfe91800a779096442ec <42725e5c1b181b757ba11d804443922982334d9b; version=fa9251afc33c81606d70cfe91800a779096442ec <7e1f989055622fd086c5dfb291fc72adf5660b6f; version=fa9251afc33c81606d70cfe91800a779096442ec <c7b8c2d06e437639694abe76978e915cfb73f428; version=fa9251afc33c81606d70cfe91800a779096442ec <cd5ec3ee52ce4b7e283cc11facfa420c297c8065; version=fa9251afc33c81606d70cfe91800a779096442ec <dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254; version=fa9251afc33c81606d70cfe91800a779096442ec <ef047411887ff0845afd642d6a687819308e1a4e; version=fa9251afc33c81606d70cfe91800a779096442ec <fbf4ace39b2e4f3833236afbb2336edbafd75eee; version=fa9251afc33c81606d70cfe91800a779096442ec <fc80fc2d4e39137869da3150ee169b40bf879287

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.1Linux kernel CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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