Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix Preauh_HashValue race condition
If client send multiple session setup requests to ksmbd,
Preauh_HashValue race condition could happen.
There is no need to free sess->Preauh_HashValue at session setup phase.
It can be freed together with session at connection termination phase.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.15 | 6.1.148 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.16.3-1 | — |
| Debian 13 | linux | 6.12.43-1 | — |
| Debian 12 | linux | 6.1.148-1 | — |
| Debian 11 | linux-6.1 | 6.1.153-1~deb11u1 | DLA-4328-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | 6.8.0-1016.20 | — |
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1083.85 | — |
| Ubuntu 25.10 | linux-azure-fde | No fix yet | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-94.96 | USN-8015-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1045.47 | USN-8015-4 |
| Ubuntu 24.04 LTS | linux-aws-6.14 +2 | 6.14.0-1017.17~24.04.1 | USN-7934-1, USN-7879-3 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1046.52 | USN-8074-1 |
| Ubuntu 24.04 LTS | linux-azure-fde | 6.8.0-1046.53 | — |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1039.42 | — |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1046.49 | USN-8015-4 |
| Ubuntu 24.04 LTS | linux-gcp-6.14 | 6.14.0-1020.21~24.04.1 | USN-7879-4 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1042.47 | USN-8015-1 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1029.32 | USN-8015-1 |
| Ubuntu 24.04 LTS | linux-hwe-6.14 | 6.14.0-36.36~24.04.1 | USN-7879-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1043.43 | USN-8015-4 |
| Ubuntu 24.04 LTS | linux-intel +12 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-94.96.1 | USN-8015-5 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1045.48 | USN-8016-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1045.48.1 | USN-8016-1 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1020.20 | — |
| Ubuntu 24.04 LTS | linux-oem-6.14 | 6.14.0-1016.16 | USN-7880-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1042.43 | USN-8015-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1045.49 | USN-8015-1 |
| Ubuntu 24.04 LTS | linux-riscv-6.14 | 6.14.0-36.36.1~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1022.23 | USN-8015-5 |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-168.178 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1099.106 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1045.47~22.04.1 | USN-8015-4 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1103.112 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1051.57~22.04.1 | USN-8126-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1109.118.1 | — |
| Ubuntu 22.04 LTS | linux-azure-fde-6.8 | 6.8.0-1046.53~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1099.108 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1046.49~22.04.1 | USN-8015-4 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1095.101 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1082.90 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 +1 | 6.8.0-94.96~22.04.1 | USN-8015-1 |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1093.96 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1043.43~22.04.1 | USN-8015-4 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1094.100 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1091.96 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-94.96.1~22.04.1 | USN-8015-4 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1094.95 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1045.48~22.04.1 | USN-8016-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1051.51 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1040.40 | USN-8013-4 |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1096.102 | USN-8013-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1042.43~22.04.1 | USN-8015-1 |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1063.67 | USN-8013-4 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2036.37 | USN-8015-2 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1040.41 | USN-8015-2 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.14 | 6.14.0-1016.16~24.04.1 | USN-7879-2 |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1091.93 | USN-8013-3 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1098.107 | USN-8013-3 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1040.41~22.04.1 | USN-8015-2 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-aws-fips | 6.8.0-1045.47+fips1 | USN-8015-3 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-azure-fips | 6.8.0-1046.52+fips1 | USN-8074-2 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-94.96+fips1 | USN-8015-3 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-gcp-fips | 6.8.0-1046.49+fips1 | USN-8015-3 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1099.106+fips1 | USN-8013-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1103.112+fips1 | USN-8013-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-168.178+fips1 | USN-8013-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1099.108+fips1 | USN-8013-2 |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux-aws-5.15 | 5.15.0-1099.106~20.04.1 | USN-8013-4 |
| Ubuntu Pro 20.04 LTS | linux-azure-5.15 | 5.15.0-1103.112~20.04.1 | USN-8013-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp-5.15 | 5.15.0-1099.108~20.04.1 | USN-8013-4 |
| Ubuntu Pro 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-168.178~20.04.1 | USN-8013-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm-5.15 | 5.15.0-1093.96~20.04.1 | USN-8013-1 |
| Ubuntu Pro 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1094.100~20.04.1 | USN-8013-1 |
| Ubuntu Pro 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1051.51~20.04.1 | USN-8013-1 |
| Ubuntu Pro 20.04 LTS | linux-oracle-5.15 | 5.15.0-1096.102~20.04.1 | USN-8013-4 |
| Ubuntu Pro 20.04 LTS | linux-riscv-5.15 | 5.15.0-1094.98~20.04.1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
toshithh/CVE-2025-38561 ★ 0 · Oct 8, 2025
ksmbd: Preauh_HashValue race condition If client send multiple session setup requests to ksmbd, Preauh_HashValue race condition could happen.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 21
- WID-SEC-2025-1869 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8126-1 linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8074-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8074-2 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8015-1 linux, linux-gke, linux-gkeop, linux-hwe-6.8, linux-oracle, linux-oracle-6.8, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8013-1 linux, linux-aws, linux-azure, linux-azure-5.15, linux-gcp, linux-gke, linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iotg, linux-intel-iotg-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8016-1 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8015-3 linux-fips, linux-aws-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8015-5 linux-lowlatency, linux-xilinx vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8013-3 linux-realtime, linux-intel-iot-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8013-4 linux-aws-5.15, linux-gcp-5.15, linux-nvidia-tegra-igx, linux-oracle-5.15, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8015-2 linux-realtime, linux-realtime-6.8, linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8013-2 linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7934-1 linux-azure, linux-azure-6.14 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8015-4 linux-aws, linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-ibm, linux-ibm-6.8, linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7879-4 linux-gcp-6.14, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7879-3 linux-aws-6.14, linux-oracle-6.14 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7880-1 linux-oem-6.14 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7879-2 linux-realtime-6.14 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7879-1 linux, linux-aws, linux-gcp, linux-hwe-6.14, linux-oracle, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-4328-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://git.kernel.org/stable/c/fbf5c0845ed15122a770bca9be1d9b60b470d3aa
- https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829
- https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c
- https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc
- https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc
- https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6
- https://www.zerodayinitiative.com/advisories/ZDI-25-916/