CVE-2026-98057Hinoki check available

Kernel memory corruption via unchecked persistent metadata

Published Sep 25, 2026 · Updated Sep 25, 2026

Heap out-of-bounds write in affected Linux kernels allows attackers to corrupt kernel memory via persistent ring-buffer metadata. The rb_cpu_meta_valid function trusts saved meta->nr_subbufs when walking a bitmap allocated for nr_pages + 1 entries instead of verifying that the counts match. Reachability requires persistent tracing across boots and a mismatched saved count; validation then writes beyond the bitmap and can crash the kernel.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap out-of-bounds write in affected Linux kernels allows attackers to corrupt kernel memory via persistent ring-buffer metadata. The rb_cpu_meta_valid function trusts saved meta->nr_subbufs when walking a bitmap allocated for nr_pages + 1 entries instead of verifying that the counts match. Reachability requires persistent tracing across boots and a mismatched saved count; validation then writes beyond the bitmap and can crash the kernel.

The record

CVE
CVE-2026-98057
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=0d547a6f5e8fad26ebc12f501d7d19fccdbad6bf
  2. Affected versionversion=3ec743d558f111d8999aea24577ba66c65ee2eeb <f0467190e6a9fc61e343c8064ef16aad513788c3
  3. Affected versionversion=6.12.16 <6.12.111
  4. Affected versionversion=6.13.4 <6.14
  5. Affected versionversion=6.14
  6. Affected versionversion=f5b95f1fa2ef3a03f49eeec658ba97e721412b32 <69d502457e3f76142f7fcf6e2625e80e0ce8a60f
  7. Affected versionversion=f5b95f1fa2ef3a03f49eeec658ba97e721412b32 <6c001a62c34f13fe1c6a24304c289b387d9e697d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0d547a6f5e8fad26ebc12f501d7d19fccdbad6bf; version=3ec743d558f111d8999aea24577ba66c65ee2eeb <f0467190e6a9fc61e343c8064ef16aad513788c3; version=6.12.16 <6.12.111; version=6.13.4 <6.14; version=6.14; version=f5b95f1fa2ef3a03f49eeec658ba97e721412b32 <69d502457e3f76142f7fcf6e2625e80e0ce8a60f; version=f5b95f1fa2ef3a03f49eeec658ba97e721412b32 <6c001a62c34f13fe1c6a24304c289b387d9e697d

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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