CVE-2026-64103

Local system crash via unquiesced completion tasklet

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux Kernel ISCI SCSI driver allows local users to crash the system during device removal or module unload. isci_host_deinit() omits tasklet_kill() after interrupt scheduling is quiesced, allowing a queued callback to dereference the freed ihost. Exploitation requires local low-privileged access and teardown of an active ISCI controller; the demonstrated result is a system crash.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel ISCI SCSI driver allows local users to crash the system during device removal or module unload. isci_host_deinit() omits tasklet_kill() after interrupt scheduling is quiesced, allowing a queued callback to dereference the freed ihost. Exploitation requires local low-privileged access and teardown of an active ISCI controller; the demonstrated result is a system crash.

The record

CVE
CVE-2026-64103
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0
  2. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <1412995e10c74644b47f242aea6e4f3d4180e806
  3. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <309c6058622d080fe8c2fab87c30da82d834d989
  4. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c
  5. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <a83d3e4daba40d49324cec1c51ed261e1ea48cf1
  6. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <ab2266601a875982f2d2033f41e070a6d5e615e2
  7. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <b52a8d52c3125ec9a93106ed816582368de34426
  8. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <b9ff8631006233ba246828ac70409d2cb2da38d3
  9. Affected versionversion=6f231dda68080759f1aed3769896e94c73099f0f <cb9e72c50e6c81a5903f27e0b397ce8525d7539b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.0; version=6f231dda68080759f1aed3769896e94c73099f0f <1412995e10c74644b47f242aea6e4f3d4180e806; version=6f231dda68080759f1aed3769896e94c73099f0f <309c6058622d080fe8c2fab87c30da82d834d989; version=6f231dda68080759f1aed3769896e94c73099f0f <6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c; version=6f231dda68080759f1aed3769896e94c73099f0f <a83d3e4daba40d49324cec1c51ed261e1ea48cf1; version=6f231dda68080759f1aed3769896e94c73099f0f <ab2266601a875982f2d2033f41e070a6d5e615e2; version=6f231dda68080759f1aed3769896e94c73099f0f <b52a8d52c3125ec9a93106ed816582368de34426; version=6f231dda68080759f1aed3769896e94c73099f0f <b9ff8631006233ba246828ac70409d2cb2da38d3; version=6f231dda68080759f1aed3769896e94c73099f0f <cb9e72c50e6c81a5903f27e0b397ce8525d7539b

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

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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