Log in Start free

Vulnerability · Published Sep 17, 2026 · Assigned by Linux

CVE-2026-90203Squashfs: check block offset is not negative

High 7.1

In plain English

A high-severity 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 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.2%top 93.4% 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: Squashfs: check block offset is not negative If a negative offset is read off disk (for example the offset into the decompressed fragment block), this will cause squashfs_copy_data() to perform an out of bounds access. Fix by checking if offset is negative, and returning 0. This matches existing behaviour where an offset beyond the block returns 0 bytes copied. To trigger this out of bounds access requires a crafted Squashfs filesystem and CAP_SYS_ADMIN to mount it. Unprivileged users will not be able to mount such a filesystem, but once mounted, an unprivileged user can trigger the out of bounds access by reading the crafted file with the negative offset.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.190-1DEBIAN-CVE-2026-90203
Debian:13linux6.12.111-1DEBIAN-CVE-2026-90203
Debian:14linux7.2.6-1DEBIAN-CVE-2026-90203
Debian:12linux-6.126.12.111-1~deb12u1DEBIAN-CVE-2026-90203
Ubuntu:22.04:LTSlinux5.15.0-202.212UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-aws5.15.0-1119.126UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure5.15.0-1125.134UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1124.133UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gcp5.15.0-1120.130UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gke5.15.0-1115.121UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1102.110UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-ibm5.15.0-1113.117UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1114.120UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-kvm5.15.0-1111.116UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-197.207UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1114.115UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1070.72UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1059.59UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oracle5.15.0-1116.122UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90203
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-90203
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-90203
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-90203

Affected products (as reported)

VendorProductVersions
Linux Linux f400e12656ab518be107febfe2315fb1eab5a342 – before b169185d5c672b989985c6c2e38cafab2548ba88f400e12656ab518be107febfe2315fb1eab5a342 – before c2a126fca820ae74872da28de68dc74d4595dc4bf400e12656ab518be107febfe2315fb1eab5a342 – before 95dadf366c117dcdca78a570e6832071deab1ecdf400e12656ab518be107febfe2315fb1eab5a342 – before 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84f400e12656ab518be107febfe2315fb1eab5a342 – before bbb2218eb072b0a15dc063929200183bd23c2344f400e12656ab518be107febfe2315fb1eab5a342 – before d0a3729d464fcf516416a41cf304c0c92126ee03f400e12656ab518be107febfe2315fb1eab5a342 – before e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fef400e12656ab518be107febfe2315fb1eab5a342 – before e300eb5002925b29be803d2661af07266cfa267e
Linux Linux 2.6.29

References