SB20260720123 - Use-after-free in Linux kernel scsi isci driver
Published: July 20, 2026
Security Bulletin ID
SB20260720123
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-64103)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the isci completion tasklet in the ISCI driver when removing a device or unloading the driver while queued tasklet processing is still possible. A local user can trigger device removal or driver unload to cause a denial of service.
The stale callback may dereference ihost and access ihost->smu_registers after the host lifetime ends.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806
- https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989
- https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c
- https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1
- https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2
- https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426
- https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3
- https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539b