CVE-2026-89717

Kernel crash via cleared primary compressor

Published Sep 11, 2026 · Updated Sep 11, 2026

NULL-pointer dereference in the Linux zram module 6.12 allows local users to crash the kernel through local sysfs operations. zram_destroy_comps() clears every compressor name after a failed disksize_store() initialization, so comp_algorithm_show() later passes a NULL primary compressor to strcmp(). Reaching the invalid state requires permission to configure zram through sysfs; reading comp_algorithm then triggers the kernel NULL dereference and service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in the Linux zram module 6.12 allows local users to crash the kernel through local sysfs operations. zram_destroy_comps() clears every compressor name after a failed disksize_store() initialization, so comp_algorithm_show() later passes a NULL primary compressor to strcmp(). Reaching the invalid state requires permission to configure zram through sysfs; reading comp_algorithm then triggers the kernel NULL dereference and service interruption.

The record

CVE
CVE-2026-89717
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <5cec3e60e9f2d1324179df3aa91656f90095cf8f
  2. Affected versionversion=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <dde75313eed0b014c437f48dd75c0308b592cbf9
  3. Affected versionversion=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <dea8f13c3dfad8b990f8ea96c997aabeebbc1d22
  4. Affected versionversion=6.11.4 <6.12
  5. Affected versionversion=6.12
  6. Affected versionversion=6.6.57 <6.7
  7. Affected versionversion=6e20720b12299595154857fa98222729f0d5823c
  8. Affected versionversion=c4e5683c3031a33dc46954e99d37cbd2f706cdb6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <5cec3e60e9f2d1324179df3aa91656f90095cf8f; version=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <dde75313eed0b014c437f48dd75c0308b592cbf9; version=486fd58af7ac1098b68370b1d4d9f94a2a1c7124 <dea8f13c3dfad8b990f8ea96c997aabeebbc1d22; version=6.11.4 <6.12; version=6.12; version=6.6.57 <6.7; version=6e20720b12299595154857fa98222729f0d5823c; version=c4e5683c3031a33dc46954e99d37cbd2f706cdb6

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

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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

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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