In the Linux kernel, the following vulnerability has been resolved:
exfat: fix improper check of dentry.stream.valid_size
We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang.
Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue.
This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-libbpf-staticUpgrade kernel6.12-modules-extraUpgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-libbpf-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade perf6.12-debuginfoUpgrade bpftool6.12-debuginfoUpgrade kernel6.12Upgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-libbpfUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-toolsUpgrade perf6.12Upgrade kernel6.12-tools-develUpgrade kernel-livepatch-6.12.63-84.121Upgrade kernel6.12-debuginfo-common-x86_64Upgrade python3-perf6.12Upgrade kernel6.12-debuginfoUpgrade kernel6.12-headersUpgrade kernel6.12-devel | Feb 20, 2026 | Dec 6, 2025 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Jan 15, 2026 | Dec 6, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 6, 2025 |
| Ubuntu | — | Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-oem-22.04dUpgrade linux-image-raspi-6.17Upgrade linux-image-gkeopUpgrade linux-image-oracleUpgrade linux-image-realtime-6.17Upgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-aws-64kUpgrade linux-image-xilinxUpgrade linux-image-nvidia-64kUpgrade linux-image-6.17.0-1011-oemUpgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-gcpUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-fips-6.8Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gcp-6.17Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.17.0-1006-realtimeUpgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-gcp-6.8Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-gkeUpgrade linux-image-aws-6.17Upgrade linux-image-virtualUpgrade linux-image-virtual-6.17Upgrade linux-image-intel-iotgUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.17.0-14-generic-64kUpgrade linux-image-6.8.0-1035-gkeopUpgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-realtimeUpgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-6.8.0-106-fipsUpgrade linux-image-azure-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-oracle-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-6.8.0-1050-aws-fipsUpgrade linux-image-6.17.0-1007-gcp-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-6.8.0-1050-awsUpgrade linux-image-lowlatencyUpgrade linux-image-ibm-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-fipsUpgrade linux-image-azure-6.17Upgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-6.8.0-106-genericUpgrade linux-image-gke-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1047-oracle-64kUpgrade linux-image-gke-6.8Upgrade linux-image-kvmUpgrade linux-image-generic-6.17Upgrade linux-image-6.17.0-1008-raspiUpgrade linux-image-azure-lts-24.04Upgrade linux-image-gke-64k-6.8Upgrade linux-image-generic-64kUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-ibmUpgrade linux-image-6.17.0-1007-gcpUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-6.17.0-1007-aws-64kUpgrade linux-image-6.17.0-1007-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-6.17.0-1007-oracleUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-22.04aUpgrade linux-image-azureUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-generic-6.8Upgrade linux-image-oem-6.17Upgrade linux-image-nvidiaUpgrade linux-image-6.17.0-14-genericUpgrade linux-image-raspi-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-oracle-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-6.17.0-1007-awsUpgrade linux-image-aws-fips-6.8Upgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-gcp-64kUpgrade linux-image-generic-64k-6.17Upgrade linux-image-aws-64k-6.17Upgrade linux-image-oracle-6.17Upgrade linux-image-6.17.0-1008-azureUpgrade linux-image-xilinx-6.8Upgrade linux-image-awsUpgrade linux-image-ibm-classicUpgrade linux-image-gcp-fipsUpgrade linux-image-realtime-6.8.1Upgrade linux-image-oracle-64k-6.17Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-virtual-6.8Upgrade linux-image-oracle-64k-6.8 | Feb 13, 2026 | Feb 12, 2026 |
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