CVE-2026-89988

Freed-memory dereference via kprobe blacklist race

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux kernel kprobes allows attackers to dereference freed memory during concurrent module unloading and blacklist checks. The __within_kprobe_blacklist() path walks kprobe_blacklist without synchronization while kprobe_remove_area_blacklist() deletes entries and immediately frees them with kfree(). Reaching the race requires a blacklist lookup concurrent with module unloading; published material does not identify an unprivileged trigger or bound the consequence beyond invalid memory access.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel kprobes allows attackers to dereference freed memory during concurrent module unloading and blacklist checks. The __within_kprobe_blacklist() path walks kprobe_blacklist without synchronization while kprobe_remove_area_blacklist() deletes entries and immediately frees them with kfree(). Reaching the race requires a blacklist lookup concurrent with module unloading; published material does not identify an unprivileged trigger or bound the consequence beyond invalid memory access.

The record

CVE
CVE-2026-89988
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=3.16
  2. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <0c4256196b3a105307e2235fbfd85e768bbcdd0f
  3. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <518d9b5568bb06f86e4434f7a30faa9612ea91ad
  4. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <5da247e4d1e8661d4d6f997101d59967e8994e32
  5. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <630ed8734a02b992e8a97538179c2ece42c5210f
  6. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <6e62cf983a2bd547e6bbd3f935539233e5f97f8f
  7. Affected versionversion=376e242429bf8539ef39a080ac113c8799840b13 <8f406205003f741225f620f0e357ca0de71d45e3

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.16; version=376e242429bf8539ef39a080ac113c8799840b13 <0c4256196b3a105307e2235fbfd85e768bbcdd0f; version=376e242429bf8539ef39a080ac113c8799840b13 <518d9b5568bb06f86e4434f7a30faa9612ea91ad; version=376e242429bf8539ef39a080ac113c8799840b13 <5da247e4d1e8661d4d6f997101d59967e8994e32; version=376e242429bf8539ef39a080ac113c8799840b13 <630ed8734a02b992e8a97538179c2ece42c5210f; version=376e242429bf8539ef39a080ac113c8799840b13 <6e62cf983a2bd547e6bbd3f935539233e5f97f8f; version=376e242429bf8539ef39a080ac113c8799840b13 <8f406205003f741225f620f0e357ca0de71d45e3

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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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