CVE-2026-64103
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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().
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806Patch
- https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989Patch
- https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763cPatch
- https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1Patch
- https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2Patch
- https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426Patch
- https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3Patch
- https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.