NULL pointer dereference in Linux kernel - CVE-2026-89958
Published: September 17, 2026
Vulnerability identifier: #VU150324
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89958
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the s390/vfio-ap AP bus configuration callbacks when handling AP bus configuration changes while matrix_mdev->kvm is unset. A local user can trigger the AP bus configuration callbacks to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89958
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/178ea7a1c2c3c0c01d14b8f60aa35f1e0cdc6b78
- https://git.kernel.org/stable/c/334b435b951353f934d5110c4630e0cb58d2f9a7
- https://git.kernel.org/stable/c/4f7e869d0db24ae07b4c888fd3bc21554eef775d
- https://git.kernel.org/stable/c/5e932abfcce6189d067fffb0eb8214443bc04374
- https://git.kernel.org/stable/c/d50346801b4f144e42b49cd4f1496010498ab114