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Vulnerability · Published Sep 16, 2026 · Assigned by Linux

CVE-2026-90023usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 84.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers() Previously fsg_num_buffers_validate() was removed as it was not necessary due to Kconfig setting the limits for n from 2 to 256 with default as 2. However, setting the page content in such a way that kstrtou8() reflects n value as either 0 or 1 bypasses these restrictions leading to a null pointer dereference if n is 0. Fix this by adding a check for n < 2 and returning -EINVAL if n is either 0 or 1 consistent with Kconfig logic.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-90023
Debian:13linux6.12.113-1DEBIAN-CVE-2026-90023
Debian:14linux7.2.6-1DEBIAN-CVE-2026-90023
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-90023
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90023
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-90023
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-90023
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-90023

Affected products (as reported)

VendorProductVersions
Linux Linux fe5a6c48fd954489f51aab151d5dad9254c76419 – before 38edd187a37db0d8e4bf84cc954dbdbe7bfa366ffe5a6c48fd954489f51aab151d5dad9254c76419 – before e54820b9dc1d6d731ecc3e51462445dc952906a7fe5a6c48fd954489f51aab151d5dad9254c76419 – before 5d56dbaeb81d5cd967cdee8ddcc70814b7139246fe5a6c48fd954489f51aab151d5dad9254c76419 – before f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebffe5a6c48fd954489f51aab151d5dad9254c76419 – before 51cc9af4f2d3f0b765266aced66b9b532b423b13fe5a6c48fd954489f51aab151d5dad9254c76419 – before 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957fe5a6c48fd954489f51aab151d5dad9254c76419 – before b9b5b5df5b8dd3c1572ed267200276a44cc67d8efe5a6c48fd954489f51aab151d5dad9254c76419 – before 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc
Linux Linux 4.8

References