CVE-2023-53634

Kernel panic via invalid BPF trampoline return

Published Oct 7, 2025 · Updated Oct 7, 2025

Denial of service in the Linux kernel allows local users to panic arm64 BTI-enabled systems through BPF tracing. With BPF_TRAMP_F_CALL_ORIG set, the arm64 trampoline uses BLR to return to an instruction lacking PACIASP or BTI, triggering a BTI exception. This requires a BTI-enabled arm64 kernel and a locally loaded tracing program that calls the original function; the resulting exception stops the kernel.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to panic arm64 BTI-enabled systems through BPF tracing. With BPF_TRAMP_F_CALL_ORIG set, the arm64 trampoline uses BLR to return to an instruction lacking PACIASP or BTI, triggering a BTI exception. This requires a BTI-enabled arm64 kernel and a locally loaded tracing program that calls the original function; the resulting exception stops the kernel.

The record

CVE
CVE-2023-53634
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=6.0
  2. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <738a96c4a8c36950803fdd27e7c30aca92dccefd
  3. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <8b9c64942ada229f52fe6f1b537a50f88b3c2673
  4. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <eabc166919d169e105263974991f52b0351e431a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=efc9909fdce00a827a37609628223cd45bf95d0b <738a96c4a8c36950803fdd27e7c30aca92dccefd; version=efc9909fdce00a827a37609628223cd45bf95d0b <8b9c64942ada229f52fe6f1b537a50f88b3c2673; version=efc9909fdce00a827a37609628223cd45bf95d0b <eabc166919d169e105263974991f52b0351e431a

Published CVSS scores

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

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

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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