Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"),
response buffer management was changed to use dynamic iov array.
In the new design, smb2_calc_max_out_buf_len() expects the second
argument (hdr2_len) to be the offset of ->Buffer field in the
response structure, not a hardcoded magic number.
Fix the remaining call sites to use the correct offsetof() value.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.15.145 – < 5.15.203, 6.1.71 – < 6.1.168, 6.6 | 5.15.203 |
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 | 6.19.11-1 | — |
| Debian 13 | linux | 6.12.85-1 | — |
| Debian 12 | linux | 6.1.170-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | 6.8.0-1026.30 | — |
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1095.97 | — |
| Ubuntu 25.10 | linux | 6.17.0-40.40 | USN-8490-1 |
| Ubuntu 25.10 | linux-aws | 6.17.0-1019.19 | USN-8490-1 |
| Ubuntu 25.10 | linux-azure +1 | No fix yet | — |
| Ubuntu 25.10 | linux-gcp | 6.17.0-1020.22 | USN-8490-1 |
| Ubuntu 25.10 | linux-oracle | 6.17.0-1018.18 | USN-8490-1 |
| Ubuntu 25.10 | linux-raspi | 6.17.0-1021.21 | USN-8546-1 |
| Ubuntu 25.10 | linux-realtime | 6.17.0-1017.19 | USN-8490-2 |
| Ubuntu 25.10 | linux-riscv | 6.17.0-40.40.1 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-134.134 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1060.63 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-aws-6.17 | 6.17.0-1019.19~24.04.1 | USN-8490-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1063.71 | USN-8606-1 |
| Ubuntu 24.04 LTS | linux-azure-6.17 | 6.17.0-1021.21~24.04.1 | USN-8604-1 |
| Ubuntu 24.04 LTS | linux-azure-fde | 6.8.0-1062.69 | USN-8607-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1063.69 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-gcp-6.17 | 6.17.0-1020.22~24.04.1 | USN-8490-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1058.64 | USN-8492-2 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1045.48 | USN-8492-2 |
| Ubuntu 24.04 LTS | linux-hwe-6.17 | 6.17.0-40.40~24.04.1 | USN-8545-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1060.61 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-134.134.1 | USN-8497-1 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1058.61 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-nvidia-6.17 | 6.17.0-1026.26 | USN-8508-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1058.61.1 | USN-8492-2 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1029.30 | USN-8498-1 |
| Ubuntu 24.04 LTS | linux-oem-6.17 | 6.17.0-1028.28 | USN-8491-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1057.58 | USN-8492-1 |
| Ubuntu 24.04 LTS | linux-oracle-6.17 +1 | 6.17.0-1018.18~24.04.1 | USN-8605-1, USN-8490-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1060.64 | USN-8492-4 |
| Ubuntu 24.04 LTS | linux-riscv +20 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-vmware | 6.8.0-1008.8 | — |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1032.33 | USN-8499-1 |
| Ubuntu 22.04 LTS | linux | 5.15.0-185.195 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1111.118 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1060.63~22.04.1 | USN-8492-2 |
| Ubuntu 22.04 LTS | linux-azure +1 | 5.15.0-1116.125 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1063.71~22.04.1 | USN-8606-1 |
| Ubuntu 22.04 LTS | linux-azure-fde-6.8 | 6.8.0-1062.69~22.04.1 | USN-8609-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1111.121 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1063.69~22.04.1 | USN-8492-2 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1107.113 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1094.102 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-136.136~22.04.1 | USN-8619-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1105.109 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1060.61~22.04.1 | USN-8492-2 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1106.112 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1103.108 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-183.193 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-134.134.1~22.04.1 | USN-8497-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1106.107 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1058.61~22.04.1 | USN-8492-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1063.63 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1052.52 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1108.114 | USN-8493-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1057.58~22.04.1 | USN-8492-2 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1105.108 | USN-8527-1 |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 | 6.8.0-134.134~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1074.78 | USN-8528-1 |
Show 13 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 | 6.8.0-2049.50 | USN-8492-3 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1055.56 | USN-8492-1 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.14 | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.17 | 6.17.0-1017.19~24.04.1 | USN-8490-2 |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1103.105 | USN-8493-1 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1110.119 | USN-8493-1 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1055.56~22.04.1 | USN-8492-1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-aws-fips | 6.8.0-1060.63+fips1 | USN-8492-1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-azure-fips | 6.8.0-1062.69+fips1 | USN-8492-5 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-134.134+fips1 | USN-8492-5 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-gcp-fips | 6.8.0-1063.69+fips1 | USN-8492-1 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1111.118+fips1 | USN-8493-1 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1116.125+fips1 | USN-8547-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-185.195+fips1 | USN-8493-1 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1111.121+fips1 | USN-8493-1 |
| Ubuntu Pro 26.04 LTS | linux | 7.0.0-28.28 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 26.04 LTS | linux-aws | 7.0.0-1009.9 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 26.04 LTS | linux-azure | 7.0.0-1010.10 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 26.04 LTS | linux-gcp | 7.0.0-1008.8 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux | 6.8.0-136.136 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-aws | 6.8.0-1061.64 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-azure | 6.8.0-1063.71 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-gcp | 6.8.0-1064.72 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-gke | 6.8.0-1059.67 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-ibm | 6.8.0-1061.62 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 24.04 LTS | linux-oracle | 6.8.0-1058.61 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux | 5.15.0-187.197 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-aws | 5.15.0-1113.120 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-aws-6.8 | 6.8.0-1061.64~22.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-azure | 5.15.0-1118.127 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp | 5.15.0-1114.124 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp-6.8 | 6.8.0-1064.72~22.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-gke | 5.15.0-1110.116 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-hwe-6.8 | 6.8.0-136.136~22.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-ibm | 5.15.0-1107.111 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-ibm-6.8 | 6.8.0-1061.62~22.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 22.04 LTS | linux-lowlatency | 5.15.0-197.207 | LSN-0122-1 |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-234.254 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 20.04 LTS | linux-aws-5.15 | 5.15.0-1111.118~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-azure-5.15 +1 | 5.15.0-1116.125~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp-5.15 | 5.15.0-1111.121~20.04.1 | USN-8547-1 |
| Ubuntu Pro 20.04 LTS | linux-hwe-5.15 | 5.15.0-185.195~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm-5.15 +1 | 5.15.0-1105.109~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1106.112~20.04.1 | USN-8547-1 |
| Ubuntu Pro 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-183.193~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1063.63~20.04.1 | USN-8493-1 |
| Ubuntu Pro 20.04 LTS | linux-oracle-5.15 | 5.15.0-1108.114~20.04.1 | USN-8493-2 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-254.266 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1195.208 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1205.220 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1188.205 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-234.254~18.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1158.169 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-284.318 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1195.210 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1195.208~16.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1205.220~16.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1188.205~16.04.1 | LSN-0122-1, LSN-0121-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-254.266~16.04.1 | LSN-0122-1, LSN-0121-1 |
Advisories 29
- USN-8607-1 linux-azure-fde vulnerabilities Ubuntu Security Notices (USN) · Nov 13, 2026
- USN-8609-1 linux-azure-fde-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 13, 2026
- USN-8619-1 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 13, 2026
- USN-8606-1 linux-azure, linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 13, 2026
- LSN-0122-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Nov 12, 2026
- WID-SEC-2026-1252 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8604-1 linux-azure-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8508-1 linux-nvidia-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8490-2 linux-realtime, linux-realtime-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8546-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8545-1 linux-hwe-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8491-1 linux-oem-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8490-1 linux, linux-aws, linux-aws-6.17, linux-gcp, linux-gcp-6.17, linux-oracle, linux-oracle-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8499-1 linux-xilinx vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8497-1 linux-lowlatency, linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8492-1 linux, linux-aws, linux-aws-fips, linux-gcp, linux-gcp-fips, linux-ibm, linux-nvidia, linux-nvidia-6.8, linux-oracle, linux-realtime, linux-realtime-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8492-2 linux-aws-6.8, linux-gcp-6.8, linux-gke, linux-gkeop, linux-ibm-6.8, linux-nvidia-lowlatency, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8498-1 linux-nvidia-tegra vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8492-3 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8492-5 linux-azure-fips, linux-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8492-4 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8528-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Nov 6, 2026
- USN-8493-1 linux, linux-aws, linux-aws-5.15, linux-aws-fips, linux-azure, linux-azure-5.15, linux-azure-fde-5.15, linux-fips, linux-gcp, linux-gcp-fips, linux-gke, linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iot-realtime, linux-intel-iotg, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx, linux-oracle, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8547-2 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8547-1 linux-gcp-5.15, linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8527-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8493-2 linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8605-1 linux-azure-fde-6.17 vulnerabilities Ubuntu Security Notices (USN) · Oct 17, 2026
- LSN-0121-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Aug 31, 2026
References
- https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361
- https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5
- https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683
- https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d
- https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1
- https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861
- https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb