CVE-2026-23383

Kernel control-flow hijack via torn BPF target

Published Mar 25, 2026 · Updated Mar 25, 2026

Atomic tearing in the arm64 BPF JIT in Linux Kernel allows local users to hijack kernel control flow through BPF program activity. The bpf_jit_binary_pack_alloc() function gives the JIT buffer only 4-byte alignment, so build_plt() can place the u64 bpf_plt.target field off an 8-byte boundary while bpf_arch_text_poke() updates it and JIT code loads it. The path requires local access and delegated BPF capabilities; a torn target can redirect kernel execution, expose or alter kernel memory, or panic the system.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Atomic tearing in the arm64 BPF JIT in Linux Kernel allows local users to hijack kernel control flow through BPF program activity. The bpf_jit_binary_pack_alloc() function gives the JIT buffer only 4-byte alignment, so build_plt() can place the u64 bpf_plt.target field off an 8-byte boundary while bpf_arch_text_poke() updates it and JIT code loads it. The path requires local access and delegated BPF capabilities; a torn target can redirect kernel execution, expose or alter kernel memory, or panic the system.

The record

CVE
CVE-2026-23383
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.0
  2. Affected versionversion=b2ad54e1533e91449cb2a371e034942bd7882b58 <519b1ad91de5bf7a496f2b858e9212db6328e1de
  3. Affected versionversion=b2ad54e1533e91449cb2a371e034942bd7882b58 <66959ed481a474eaae278c7f6860a2a9b188a4d6
  4. Affected versionversion=b2ad54e1533e91449cb2a371e034942bd7882b58 <80ad264da02cc4aee718e799c2b79f0f834673dc
  5. Affected versionversion=b2ad54e1533e91449cb2a371e034942bd7882b58 <ef06fd16d48704eac868441d98d4ef083d8f3d07

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=b2ad54e1533e91449cb2a371e034942bd7882b58 <519b1ad91de5bf7a496f2b858e9212db6328e1de; version=b2ad54e1533e91449cb2a371e034942bd7882b58 <66959ed481a474eaae278c7f6860a2a9b188a4d6; version=b2ad54e1533e91449cb2a371e034942bd7882b58 <80ad264da02cc4aee718e799c2b79f0f834673dc; version=b2ad54e1533e91449cb2a371e034942bd7882b58 <ef06fd16d48704eac868441d98d4ef083d8f3d07

Published CVSS scores

7.1UbuntuCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8UbuntuCVSS: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

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)
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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