CVE-2026-89556Hinoki check available

Kernel memory access via malformed ELF string tables

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds access in Linux 6.18 before 6.18.50 and 7.2 before 7.2.4 allows local users to access kernel memory via a module. elf_validity_cache_secstrings and elf_validity_cache_index_str cache offsets from ELF section headers without first requiring SHT_STRTAB. Reaching this parser requires CAP_SYS_MODULE; the published patch establishes neither disclosure nor a crash.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in Linux 6.18 before 6.18.50 and 7.2 before 7.2.4 allows local users to access kernel memory via a module. elf_validity_cache_secstrings and elf_validity_cache_index_str cache offsets from ELF section headers without first requiring SHT_STRTAB. Reaching this parser requires CAP_SYS_MODULE; the published patch establishes neither disclosure nor a crash.

The record

CVE
CVE-2026-89556
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=0 <6.18.50
  2. Affected versionversion=0 <7.2.4
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50d0aa7d25ba4bc3606f150cd69755068e79f97f
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9a5ff45689329835f874cefe5174e577d141d423
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4496dda2c6d0acf7ba5fbce14a2723a8935ceee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.18.50; version=0 <7.2.4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50d0aa7d25ba4bc3606f150cd69755068e79f97f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9a5ff45689329835f874cefe5174e577d141d423; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4496dda2c6d0acf7ba5fbce14a2723a8935ceee

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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