Description
A flaw was found in the Linux kernel's ksmbd component. A race condition between smb2 close operation and logoff in multichannel connections could result in a use-after-free issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | linux | < 5.15.145, 6.0.0 – < 6.0.*, 6.1.0 – < 6.1.29, 6.2.0 – < 6.2.16, 6.3.0 – < 6.3.2 | 5.15.145 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
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 | 6.3.7-1 | — |
| Debian 13 | linux | 6.3.7-1 | — |
| Debian 12 | linux | 6.1.37-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1040.42 | — |
| Ubuntu 24.04 LTS | linux-intel +7 | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-102.112 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1057.63 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1060.69 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1060.69.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1055.63 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1054.59 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1040.46 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1050.53 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1052.58 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1048.48 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1025.25 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1012.12 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1055.61 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1030.34 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1057.63~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1060.69~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1055.63~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-102.112~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1050.53~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1052.58~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1025.25~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1055.61~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1053.57~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1050.52 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1058.66 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1057.63+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1060.69+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-102.112+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1055.63+fips2 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
Advisories 1
- WID-SEC-2023-1255 Linux Kernel (ksmbd): Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 3, 2025