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Vulnerability · Published Oct 18, 2026 · Assigned by Linux

CVE-2026-98681smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races

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 92.8% 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: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98681
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98681
Debian:14linux7.2.10-1DEBIAN-CVE-2026-98681
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98681
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98681
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98681
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98681
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98681

Affected products (as reported)

VendorProductVersions
Linux Linux 3bc303c254335dbd7c7012cc1760b12f1d5514d3 – before f255e87b4f7eda568c37d6eae5db1d1a8aca59683bc303c254335dbd7c7012cc1760b12f1d5514d3 – before 7fa619367869be705942f087b2ecd209efc78fe13bc303c254335dbd7c7012cc1760b12f1d5514d3 – before e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c3bc303c254335dbd7c7012cc1760b12f1d5514d3 – before 3b8e7928cf1928555dc05d172dd02fb0e7692ec43bc303c254335dbd7c7012cc1760b12f1d5514d3 – before 3786ee67658a2c80fef2544e7de2cd329e043cf93bc303c254335dbd7c7012cc1760b12f1d5514d3 – before 4165641d06ef44f3a31b77a28048b6c737e885e73bc303c254335dbd7c7012cc1760b12f1d5514d3 – before d9d23d115610e0342e768f6cb525d91c7b1540273bc303c254335dbd7c7012cc1760b12f1d5514d3 – before 19465a9aeb664f1d710d0d22c07c31bfb7c85446
Linux Linux 2.6.32

References