CVE-2026-64103
scsi: isci: Fix use-after-free in device removal path
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: isci: Fix use-after-free in device removal path The ISCI completion tasklet is initialized in isci_host_alloc() (drivers/scsi/isci/init.c:496) and scheduled from both MSI-X and legacy interrupt handlers (drivers/scsi/isci/host.c:223,613). isci_host_deinit() stops the controller and waits for stop completion, but it never kills completion_tasklet before teardown continues. A top-of-function tasklet_kill() is not sufficient here: interrupts are only disabled when isci_host_stop_complete() runs, so until wait_for_stop() returns the IRQ handlers can still requeue the tasklet. The tasklet callback also re-enables interrupts after draining completions, so killing the tasklet before the source is quiesced leaves the same race open. Once wait_for_stop() returns, no further IRQ-driven scheduling can occur. Kill completion_tasklet there so teardown cannot race a queued tasklet running on a dead ihost. On remove or unload, the stale callback can otherwise dereference ihost and touch ihost->smu_registers after the host lifetime ends. A UML + KASAN analogue reproduced the failure class both with no tasklet_kill() and with tasklet_kill() placed before source quiesce, and stayed clean once the kill happened after quiescing the scheduling source. This mirrors commit f6ab594672d4 ("scsi: aic94xx: fix use-after-free in device removal path"), but ISCI needs the kill after wait_for_stop().
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 19, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64103
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the patch for the ISCI completion tasklet.
- Ensure tasklet is killed after the scheduling source is quiesced.
- Update the Linux kernel to the patched version.
- Test the fix in development and staging environments.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64103.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64103 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64103
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64103 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64103 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': '1412995e10c74644b47f242aea6e4f3d4180e806', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': 'a83d3e4daba40d49324cec1c51ed261e1ea48cf1', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': 'ab2266601a875982f2d2033f41e070a6d5e615e2', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': '309c6058622d080fe8c2fab87c30da82d834d989', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': 'cb9e72c50e6c81a5903f27e0b397ce8525d7539b', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': 'b9ff8631006233ba246828ac70409d2cb2da38d3', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': '6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c', 'versionType': 'git'}, {'status': 'affected', 'version': '6f231dda68080759f1aed3769896e94c73099f0f', 'lessThan': 'b52a8d52c3125ec9a93106ed816582368de34426', 'versionType': 'git'}], 'programFiles': ['drivers/scsi/isci/host.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/scsi/isci/host.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: scsi: isci: Fix use-after-free in device removal path The ISCI completion tasklet is initialized in isci_host_alloc() (drivers/scsi/isci/init.c:496) and scheduled from both MSI-X and legacy interrupt handlers (drivers/scsi/isci/host.c:223,613). isci_host_deinit() stops the controller and waits for stop completion, but it never kills completion_tasklet before teardown continues. A top-of-function tasklet_kill() is not sufficient here: interrupts are only disabled when isci_host_stop_complete() runs, so until wait_for_stop() returns the IRQ handlers can still requeue the tasklet. The tasklet callback also re-enables interrupts after draining completions, so killing the tasklet before the source is quiesced leaves the same race open. Once wait_for_stop() returns, no further IRQ-driven scheduling can occur. Kill completion_tasklet there so teardown cannot race a queued tasklet running on a dead ihost. On remove or unload, the stale callback can otherwise dereference ihost and touch ihost->smu_registers after the host lifetime ends. A UML + KASAN analogue reproduced the failure class both with no tasklet_kill() and with tasklet_kill() placed before source quiesce, and stayed clean once the kill happened after quiescing the scheduling source. This mirrors commit f6ab594672d4 ("scsi: aic94xx: fix use-after-free in device removal path"), but ISCI needs the kill after wait_for_stop(). Added Reference https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806 Added Reference https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989 Added Reference https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c Added Reference https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1 Added Reference https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2 Added Reference https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426 Added Reference https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3 Added Reference https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539b