CVE-2026-98063

Kernel crash via unresolved BTF variable type

Published Sep 25, 2026 · Updated Sep 25, 2026

NULL pointer dereference in Linux kernel 5.10 and affected later branches allows local users to crash the host via a crafted BPF program. btf_var_show() passes a base-BTF variable type to btf_type_id_resolve(), which dereferences the absent btf->resolved_ids table instead of resolving modifiers directly. Reaching the path requires permission to run a BPF program that sends a vmlinux BTF_KIND_VAR type to bpf_snprintf_btf(), producing a host-wide kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel 5.10 and affected later branches allows local users to crash the host via a crafted BPF program. btf_var_show() passes a base-BTF variable type to btf_type_id_resolve(), which dereferences the absent btf->resolved_ids table instead of resolving modifiers directly. Reaching the path requires permission to run a BPF program that sends a vmlinux BTF_KIND_VAR type to bpf_snprintf_btf(), producing a host-wide kernel crash.

The record

CVE
CVE-2026-98063
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=5.10
  2. Affected versionversion=c4d0bfb45068d853a478b9067a95969b1886a30f <5403a383f52fc0905703b488f7c3db4b2447dc58
  3. Affected versionversion=c4d0bfb45068d853a478b9067a95969b1886a30f <ca086264e98108b44fdf53971033811a48defe2b
  4. Affected versionversion=c4d0bfb45068d853a478b9067a95969b1886a30f <e472ae0d97865e2021ee668a13eab64013aebf23
  5. Affected versionversion=c4d0bfb45068d853a478b9067a95969b1886a30f <ea383b3ea56979ce54c8aa88e6ec67164986c401

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=c4d0bfb45068d853a478b9067a95969b1886a30f <5403a383f52fc0905703b488f7c3db4b2447dc58; version=c4d0bfb45068d853a478b9067a95969b1886a30f <ca086264e98108b44fdf53971033811a48defe2b; version=c4d0bfb45068d853a478b9067a95969b1886a30f <e472ae0d97865e2021ee668a13eab64013aebf23; version=c4d0bfb45068d853a478b9067a95969b1886a30f <ea383b3ea56979ce54c8aa88e6ec67164986c401

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
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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