CVE-2026-93148

Privilege escalation via relaxed MEM_ALLOC BTF bounds

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds memory access in Linux 6.2 through 7.2.5 allows local users with delegated BPF capabilities to read or write kernel memory. The btf_struct_walk() function applies flexible-array relaxation to MEM_ALLOC objects even though bpf_obj_new() allocates only the static BTF type size. Loading and running a crafted eBPF program requires CAP_BPF and CAP_PERFMON; approved LDX/STX instructions can leak or corrupt adjacent kernel heap objects and crash the host.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in Linux 6.2 through 7.2.5 allows local users with delegated BPF capabilities to read or write kernel memory. The btf_struct_walk() function applies flexible-array relaxation to MEM_ALLOC objects even though bpf_obj_new() allocates only the static BTF type size. Loading and running a crafted eBPF program requires CAP_BPF and CAP_PERFMON; approved LDX/STX instructions can leak or corrupt adjacent kernel heap objects and crash the host.

The record

CVE
CVE-2026-93148
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=958cf2e273f0929c66169e0788031310e8118722 <9c9ee0324c774490ae953162aaaf4561d222bd93
  3. Affected versionversion=958cf2e273f0929c66169e0788031310e8118722 <e626a50d07d43421cbf7bfb5a084b33a5e276b6e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=958cf2e273f0929c66169e0788031310e8118722 <9c9ee0324c774490ae953162aaaf4561d222bd93; version=958cf2e273f0929c66169e0788031310e8118722 <e626a50d07d43421cbf7bfb5a084b33a5e276b6e

Published CVSS scores

7.8Linux CNACVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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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