Vulnerability · Published May 27, 2026 · Assigned by Linux
CVE-2026-45972smb: client: fix potential UAF and double free in smb2_open_file()
Critical 9.8
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 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.3%top 73.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.170-1 | DEBIAN-CVE-2026-45972 |
| Debian:13 | linux | 6.12.85-1 | DEBIAN-CVE-2026-45972 |
| Debian:14 | linux | 6.18.14-1 | DEBIAN-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux | 6.8.0-134.134 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1060.63 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-aws-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1060.63~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1063.71 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1063.71~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-azure-fde | 6.8.0-1062.69 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.8 | 6.8.0-1062.69~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1063.69 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-gcp-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1063.69~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1058.64 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1045.48 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-hwe-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-136.136~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1060.61 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1060.61~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-134.134.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-134.134.1~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1058.61 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1058.61~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1058.61.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1029.30 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-oem-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1057.58 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-oracle-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1057.58~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1060.64 | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:24.04:LTS | linux-riscv-6.14 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-134.134~22.04.1 | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2026-45972 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2026-45972 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 743f70406264348c0830f38409eb6c40a42fb2db – before 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f743a6d6b332f92990958602c1e35ce0173e2dd62e9 – before 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151b64e3b5d8d759dd4333992e4ba4dadf9359952c8 – before 4d339b219004869e96c4ce56b8891f83a38da4c09ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 – before e66dcf7bb9c4df5582c82bc3582725abcbfbea73e3a43633023e3cacaca60d4b8972d084a2b06236 – before 639deb962986ef2f5e2a6d5a600c66f922471e81e3a43633023e3cacaca60d4b8972d084a2b06236 – before ebbbc4bfad4cb355d17c671223d0814ee3ef4eda6.1.163 – before 6.1.1656.6.124 – before 6.6.128 |
| Linux | Linux | 6.19 |
Weakness: CWE-825 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74
- https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151
- https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0
- https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73
- https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81
- https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda
- https://access.redhat.com/security/cve/CVE-2026-45972 vdb-entry, x_refsource_REDHAT
- RHBZ#2481973 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.json x_sadp-csaf-vex