Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec Commit… (CVE-2026-22998)
A vulnerability in the Linux kernel's nvme-tcp driver could cause NULL pointer dereferences leading to kernel panic. This occurs when the nvmet_tcp_build_pdu_iovec() function dereferences uninitialized command data structures without proper NULL checks. The issue can be triggered by sending specific H2C_DATA PDUs prematurely or with invalid command states. The vulnerability has been fixed in updated Linux kernel versions.
AI Analysis
Technical Summary
The Linux kernel's nvme-tcp subsystem had a flaw where the nvmet_tcp_build_pdu_iovec() function dereferenced pointers (cmd->req.sg and cmd->iov) without verifying if they were properly initialized. This could be triggered by sending H2C_DATA PDUs immediately after the ICREQ/ICRESP handshake before a CONNECT or NVMe write command, or by sending H2C_DATA PDUs for uninitialized or read commands. The flaw could cause NULL pointer dereferences resulting in kernel panic. The fix adds validation to ensure these pointers are initialized before use, preventing the kernel panic.
Potential Impact
Exploitation of this vulnerability can cause a denial of service via kernel panic due to NULL pointer dereferences. There is no indication of confidentiality or integrity impact. The CVSS score is 7.5 (medium severity) reflecting the potential for service disruption without privilege or user interaction requirements.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions. The Ubuntu security advisories USN-8162-1 and USN-8180-1 provide updated package versions for various Ubuntu releases including 20.04 LTS and 22.04 LTS. After updating, a system reboot is required. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. Follow vendor instructions for applying these updates.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec Commit… (CVE-2026-22998)
Description
A vulnerability in the Linux kernel's nvme-tcp driver could cause NULL pointer dereferences leading to kernel panic. This occurs when the nvmet_tcp_build_pdu_iovec() function dereferences uninitialized command data structures without proper NULL checks. The issue can be triggered by sending specific H2C_DATA PDUs prematurely or with invalid command states. The vulnerability has been fixed in updated Linux kernel versions.
CVSS v3.1
Score 7.5high
Affected software
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protected]~24.04.1?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's nvme-tcp subsystem had a flaw where the nvmet_tcp_build_pdu_iovec() function dereferenced pointers (cmd->req.sg and cmd->iov) without verifying if they were properly initialized. This could be triggered by sending H2C_DATA PDUs immediately after the ICREQ/ICRESP handshake before a CONNECT or NVMe write command, or by sending H2C_DATA PDUs for uninitialized or read commands. The flaw could cause NULL pointer dereferences resulting in kernel panic. The fix adds validation to ensure these pointers are initialized before use, preventing the kernel panic.
Potential Impact
Exploitation of this vulnerability can cause a denial of service via kernel panic due to NULL pointer dereferences. There is no indication of confidentiality or integrity impact. The CVSS score is 7.5 (medium severity) reflecting the potential for service disruption without privilege or user interaction requirements.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions. The Ubuntu security advisories USN-8162-1 and USN-8180-1 provide updated package versions for various Ubuntu releases including 20.04 LTS and 22.04 LTS. After updating, a system reboot is required. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. Follow vendor instructions for applying these updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22998
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b63742d1edb114c8b4a9f
Added to database: 07/18/2026, 11:28:52 UTC
Last enriched: 08/22/2026, 21:47:31 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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