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Vulnerability · Published Oct 18, 2026 · Assigned by Linux

CVE-2026-98686smb: client: discard post-EOF pagecache when extending a file via zero range

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

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 93.3% 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: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98686
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98686
Debian:14linux7.2.10-1DEBIAN-CVE-2026-98686
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98686
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98686
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98686
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98686
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98686

Affected products (as reported)

VendorProductVersions
Linux Linux 72c419d9b073628d3b5b0b2fc787b724f1a8c726 – before 1ecf89d8efca618e0c758c06b9a1fdde8bd941da72c419d9b073628d3b5b0b2fc787b724f1a8c726 – before 03408d15c5405f8dc3e1a114cdce2174027a85f672c419d9b073628d3b5b0b2fc787b724f1a8c726 – before 3df27277f8f95345d4a6c57367824bf1aefdbf6672c419d9b073628d3b5b0b2fc787b724f1a8c726 – before 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a18372c419d9b073628d3b5b0b2fc787b724f1a8c726 – before b75dadb50a25eed525264bf6fea44fad94e7626f72c419d9b073628d3b5b0b2fc787b724f1a8c726 – before 6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d72c419d9b073628d3b5b0b2fc787b724f1a8c726 – before da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0
Linux Linux 5.1

References