SB2026091956 - NULL pointer dereference in Linux kernel smb server
Published: September 19, 2026
Security Bulletin ID
SB2026091956
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) NULL pointer dereference (CVE-ID: CVE-2026-90165)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 an invalid pointer dereference in ksmbd_stop_durable_scavenger() when stopping the durable scavenger after its kernel thread fails to start. A local user can cause server reset handling to stop the durable scavenger to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3f8651f6bb52159c9e23993c77a2b51b9505ad64
- https://git.kernel.org/stable/c/a2eb72b4d53bb9d8d6c00f3f794eaccb4b1ce5ed
- https://git.kernel.org/stable/c/af9cb997d13a17029a0d3863e33f4c837e27a8ae
- https://git.kernel.org/stable/c/b2d78c199dfd983638662ace0612d4fade3dbea1
- https://git.kernel.org/stable/c/bef46b604732d83f8da29f782868de4d25bf972c