Vulnerability · Published Jan 13, 2026 · Assigned by Linux
CVE-2025-68786ksmbd: skip lock-range check on equal size to avoid size==0 underflow
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 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 89.8% 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: ksmbd: skip lock-range check on equal size to avoid size==0 underflow When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1` and can underflow for size==0. Skip the equal case.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.162-1 | DEBIAN-CVE-2025-68786 |
| Debian:13 | linux | 6.12.69-1 | DSA-6126-1 |
| Debian:13 | linux | 6.12.69-1 | DEBIAN-CVE-2025-68786 |
| Debian:14 | linux | 6.18.3-1 | DEBIAN-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux | 6.8.0-110.110 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux | 6.17.0-22.22 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux | 6.17.0-22.22 | USN-8177-1 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-aws | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1052.55 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-aws | 6.17.0-1012.12 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-aws | 6.17.0-1012.12 | USN-8183-2 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-aws-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-aws-6.17 | 6.17.0-1012.12~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-aws-6.17 | 6.17.0-1012.12~24.04.1 | USN-8183-2 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1052.55~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1054.60 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-azure | 6.17.0-1013.13 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-azure | 6.17.0-1013.13 | USN-8245-1 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-6.17 | 6.17.0-1013.13~24.04.1 | USN-8245-1 |
| Ubuntu:24.04:LTS | linux-azure-6.17 | 6.17.0-1013.13~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1059.65~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-fde | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-fde | 6.8.0-1058.65 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-azure-fde | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-fde-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.8 | 6.8.0-1058.65~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-nvidia | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-azure-nvidia-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gcp | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1054.57 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-gcp | 6.17.0-1012.12 | USN-8183-1 |
| Ubuntu:25.10 | linux-gcp | 6.17.0-1012.12 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gcp-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gcp-6.17 | 6.17.0-1012.12~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gcp-6.17 | 6.17.0-1012.12~24.04.1 | USN-8183-1 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1054.57~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gke | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1050.56 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-gkeop | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1037.40 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-hwe-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-hwe-6.17 | 6.17.0-22.22~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-hwe-6.17 | 6.17.0-22.22~24.04.1 | USN-8183-2 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-110.110~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-ibm | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1051.51 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1051.51~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-intel-iotg | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-kvm | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-lowlatency | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-110.110.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-110.110.1~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1051.54 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-nvidia-6.17 | 6.17.0-1018.18 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1051.54~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1051.54.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1022.22 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oem-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oem-6.17 | 6.17.0-1020.20 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oem-6.17 | 6.17.0-1020.20 | USN-8245-1 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oracle | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1049.50 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-oracle | 6.17.0-1011.11 | USN-8183-2 |
| Ubuntu:25.10 | linux-oracle | 6.17.0-1011.11 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oracle-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-oracle-6.17 | 6.17.0-1011.11~24.04.1 | USN-8183-2 |
| Ubuntu:24.04:LTS | linux-oracle-6.17 | 6.17.0-1011.11~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1049.50~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-raspi | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1052.56 | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-raspi | 6.17.0-1013.13 | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-realtime | 6.17.0-1010.11 | USN-8177-1 |
| Ubuntu:25.10 | linux-realtime | 6.17.0-1010.11 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:25.10 | linux-riscv | 6.17.0-22.22.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-riscv-6.14 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-riscv-6.17 | 6.17.0-22.22.1~24.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-110.110~22.04.1 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2025-68786 |
| Ubuntu:24.04:LTS | linux-xilinx | 6.8.0-1028.29 | UBUNTU-CVE-2025-68786 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | no fix listed | UBUNTU-CVE-2025-68786 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | f44158485826c076335d6860d35872271a83791d – before 52fcbb92e0d3acfd1448b2a43b6595d540da5295f44158485826c076335d6860d35872271a83791d – before da29cd197246c85c0473259f1cad897d9d28faeaf44158485826c076335d6860d35872271a83791d – before a6f4cfa3783804336491e0edcb250c25f9b59d33f44158485826c076335d6860d35872271a83791d – before 571204e4758a528fbd67330bd4b0dfbdafb33dd8f44158485826c076335d6860d35872271a83791d – before 5d510ac31626ed157d2182149559430350cf2104 |
| Linux | Linux | 5.15 |
References
- https://git.kernel.org/stable/c/52fcbb92e0d3acfd1448b2a43b6595d540da5295
- https://git.kernel.org/stable/c/da29cd197246c85c0473259f1cad897d9d28faea
- https://git.kernel.org/stable/c/a6f4cfa3783804336491e0edcb250c25f9b59d33
- https://git.kernel.org/stable/c/571204e4758a528fbd67330bd4b0dfbdafb33dd8
- https://git.kernel.org/stable/c/5d510ac31626ed157d2182149559430350cf2104