Vulnerability · Published May 6, 2026 · Assigned by Linux
CVE-2026-43089xfrm_user: fix info leak in build_mapping()
Medium 5.5
In plain English
A medium-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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 97.2% 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: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.176-1 | DEBIAN-CVE-2026-43089 |
| Debian:13 | linux | 6.12.85-1 | DEBIAN-CVE-2026-43089 |
| Debian:14 | linux | 6.19.14-1 | DEBIAN-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux | 5.15.0-186.196 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux | 6.8.0-136.136 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1112.119 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1061.64 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-aws | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-aws-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-aws-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1061.64~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1117.126 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1063.71 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-azure | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1063.71~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1117.126 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-fde | 6.8.0-1062.69 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-azure-fde | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-fde-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.8 | 6.8.0-1062.69~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-nvidia | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-azure-nvidia-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1112.122 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1064.72 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-gcp | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gcp-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gcp-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1064.72~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1108.114 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1059.67 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1095.103 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1046.50 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-hwe-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-hwe-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-136.136~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1106.110 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1061.62 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1061.62~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1107.113 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1104.109 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-184.194 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-136.136.2 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-136.136.2~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1107.108 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1059.62 | UBUNTU-CVE-2026-43089 |
| Ubuntu:26.04:LTS | linux-nvidia | 7.0.0-1006.6 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-nvidia-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1059.62~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1059.62.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1064.66 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1030.31 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1053.53 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oem-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oem-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1109.115 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1058.61 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-oracle | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oracle-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-oracle-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1058.61~22.04.1 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1106.109 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1061.65 | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-raspi | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-realtime | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:25.10 | linux-riscv | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-riscv-6.14 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-riscv-6.17 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-136.136~22.04.3 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-vmware | 6.8.0-1008.8 | UBUNTU-CVE-2026-43089 |
| Ubuntu:24.04:LTS | linux-xilinx | 6.8.0-1033.34 | UBUNTU-CVE-2026-43089 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1075.79 | UBUNTU-CVE-2026-43089 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before 521385cbd50ca9474396d88462fcdfa6489685d93a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f323a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before d3125c541a96fb3c0fc7210112684baf22b6c24d3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before 5a1a4b049ddde41466ccac0daeec326254b133f23a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before 700c9622b23c33b5933e6dcea816492c064e4e103a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – before 1beb76b2053b68c491b78370794b8ff63c8f8c02 |
| Linux | Linux | 2.6.29 |
References
- https://git.kernel.org/stable/c/521385cbd50ca9474396d88462fcdfa6489685d9
- https://git.kernel.org/stable/c/c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f
- https://git.kernel.org/stable/c/72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32
- https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d
- https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2
- https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c
- https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10
- https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html