Vulnerability · Published Aug 16, 2025 · Assigned by Linux
CVE-2023-3867ksmbd: fix out of bounds read in smb2_sess_setup
Critical 9.1
In plain English
A critical-severity 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 6.3% (higher than 94% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)6.3%top 6.4% 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: fix out of bounds read in smb2_sess_setup ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.52-1 | DEBIAN-CVE-2023-3867 |
| Debian:13 | linux | 6.4.11-1 | DEBIAN-CVE-2023-3867 |
| Debian:14 | linux | 6.4.11-1 | DEBIAN-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux | 5.15.0-102.112 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux | 5.15.0-102.112 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1057.63 | USN-6725-2 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1057.63 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1015.15~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1015.15~22.04.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1060.69 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1060.69 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | 6.2.0-1016.16~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | 6.2.0-1016.16~22.04.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1060.69.1 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1060.69.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | 6.2.0-1016.16~22.04.1.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | 6.2.0-1016.16~22.04.1.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1055.63 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1055.63 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | 6.2.0-1018.20~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | 6.2.0-1018.20~22.04.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1054.59 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1054.59 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1040.46 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1040.46 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-36.37~22.04.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-36.37~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1050.53 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1050.53 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1052.58 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1052.58 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1054.59 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1054.59 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-102.112 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-102.112 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1016.16~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1016.16~22.04.1 | USN-6464-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1048.48 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1048.48 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | 6.2.0-1011.11 | USN-6466-1 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | 6.2.0-1011.11 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1025.25 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1012.12 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | 6.1.0-1019.19 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1055.61 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1055.61 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1050.53 | USN-6725-1 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1050.53 | UBUNTU-CVE-2023-3867 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | 6.2.0-1009.10~22.04.1 | UBUNTU-CVE-2023-3867 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | 6.2.0-1009.10~22.04.1 | USN-6520-1 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1030.34 | UBUNTU-CVE-2023-3867 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – before 676392184785ace61e939831e7ca44a03d438c3be2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – before ef572ffa8eb44111eed2925fbb2adca78bdcbf61e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – before 2ba03cecb12ac7ac9e0170e251543c56832d9959e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – before 98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8 |
| Linux | Linux | 5.15 |