Improper input validation in Linux kernel - CVE-2026-89973
Published: September 16, 2026
Vulnerability identifier: #VU150307
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89973
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in nvme_tcp_handle_c2h_data() when processing a C2HData PDU for a write command. A remote attacker can send a C2HData PDU in response to a write command to cause a denial of service.
On hosts booted with panic_on_warn, the triggered kernel warning is fatal.
Affected software
Linux kernel
How to mitigate CVE-2026-89973
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde
- https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e
- https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2
- https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee
- https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355
- https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9
- https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74
- https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1