In the Linux kernel, the following vulnerability has been resolved:
smb: client: split cached_fid bitfields to avoid shared-byte RMW races
is_open, has_lease and on_list are stored in the same bitfield byte in struct cached_fid but are updated in different code paths that may run concurrently. Bitfield assignments generate byte read–modify–write operations (e.g. `orb $mask, addr` on x86_64), so updating one flag can restore stale values of the others.
A possible interleaving is: CPU1: load old byte (has_lease=1, on_list=1) CPU2: clear both flags (store 0) CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits
To avoid this class of races, convert these flags to separate bool fields.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-tools-debuginfoUpgrade python3-perf-debuginfoUpgrade perf6.12-debuginfoUpgrade kernel-modules-extraUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extra-commonUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel6.12-headersUpgrade perfUpgrade python3-perfUpgrade python3-perf6.12Upgrade kernel-develUpgrade kernel6.12-develUpgrade kernel-libbpf-debuginfoUpgrade bpftool-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel-libbpf-staticUpgrade bpftoolUpgrade kernel-libbpf-develUpgrade perf6.12Upgrade kernel6.12-libbpf-staticUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel6.12-libbpf-develUpgrade kernel-headersUpgrade kernel-livepatch-6.12.73-95.123Upgrade kernel-livepatch-6.1.164-196.303Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-toolsUpgrade kernel6.12-libbpfUpgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel-libbpfUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade perf-debuginfoUpgrade kernel6.12Upgrade kernel-debuginfo-common-x86_64 | Mar 27, 2026 | Feb 18, 2026 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Mar 16, 2026 | Mar 16, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Mar 25, 2026 | Feb 18, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Feb 18, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1058-nvidia-lowlatency-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-gke-64k-6.8Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-aws-fips-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-intel-iotgUpgrade linux-image-realtime-6.8.1Upgrade linux-image-fips-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-1045-gkeopUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-laptop-23.10Upgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-134-lowlatency-64kUpgrade linux-image-oem-20.04dUpgrade linux-image-6.8.0-1062-azure-fipsUpgrade linux-image-gcpUpgrade linux-image-generic-64kUpgrade linux-image-generic-6.8Upgrade linux-image-realtimeUpgrade linux-image-nvidia-tegraUpgrade linux-image-6.8.0-1060-aws-64kUpgrade linux-image-kvmUpgrade linux-image-oracle-6.8Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-6.8.0-1057-oracleUpgrade linux-image-gcp-fipsUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-6.8.0-134-genericUpgrade linux-image-gkeUpgrade linux-image-azureUpgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-1063-azureUpgrade linux-image-gcp-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-azure-fipsUpgrade linux-image-xilinxUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-raspi-6.8Upgrade linux-image-6.8.0-1029-nvidia-tegra-rtUpgrade linux-image-6.8.0-1057-oracle-64kUpgrade linux-image-virtual-6.8Upgrade linux-image-aws-6.8Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-ibm-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-aws-64kUpgrade linux-image-6.8.0-1060-ibmUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-1058-gke-64kUpgrade linux-image-6.8.0-2049-raspi-realtimeUpgrade linux-image-6.8.0-136-genericUpgrade linux-image-xilinx-6.8Upgrade linux-image-raspiUpgrade linux-image-azure-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-6.8.1-1055-realtimeUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1029-nvidia-tegraUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gke-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-1058-nvidiaUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-nvidiaUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-1058-nvidia-64kUpgrade linux-image-6.8.0-1058-nvidia-lowlatencyUpgrade linux-image-6.8.0-134-fipsUpgrade linux-image-6.8.0-1063-gcpUpgrade linux-image-6.8.0-1060-raspiUpgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.8.0-1060-aws-fipsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-oracleUpgrade linux-image-genericUpgrade linux-image-azure-fde-6.8Upgrade linux-image-6.8.0-134-generic-64kUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-oem-20.04Upgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1063-gcp-fipsUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-134-lowlatencyUpgrade linux-image-6.8.0-1058-gkeUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-awsUpgrade linux-image-virtualUpgrade linux-image-gcp-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oem-20.04bUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1063-gcp-64kUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-aws-fipsUpgrade linux-image-azure-lts-24.04Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-gkeop-6.8Upgrade linux-image-ibmUpgrade linux-image-6.8.0-1060-awsUpgrade linux-image-lowlatency-64kUpgrade linux-image-ibm-classicUpgrade linux-image-generic-lpaeUpgrade linux-image-fipsUpgrade linux-image-azure-fdeUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-6.8 | Jul 2, 2026 | Jul 1, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 17, 2026 | Feb 18, 2026 |
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