Vulnerability · Published Nov 12, 2025 · Assigned by Linux
CVE-2025-40198ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
High 7.8
In plain English
A high-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 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 94.2% 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: ext4: avoid potential buffer over-read in parse_apply_sb_mount_options() Unlike other strings in the ext4 superblock, we rely on tune2fs to make sure s_mount_opts is NUL terminated. Harden parse_apply_sb_mount_options() by treating s_mount_opts as a potential __nonstring.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.158-1 | DEBIAN-CVE-2025-40198 |
| Debian:13 | linux | 6.12.57-1 | DEBIAN-CVE-2025-40198 |
| Debian:14 | linux | 6.17.6-1 | DEBIAN-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux | 6.8.0-106.106 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux | 6.17.0-14.14 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-aws | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1050.53 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-aws | 6.17.0-1007.7 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-aws-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-aws-6.17 | 6.17.0-1007.7~24.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1050.53~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1051.57 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-azure | 6.17.0-1008.8 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1051.57~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-fde | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-fde | 6.8.0-1058.65 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-azure-fde | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-fde-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.8 | 6.8.0-1058.65~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-nvidia | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-azure-nvidia-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gcp | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1052.55 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-gcp | 6.17.0-1007.7 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gcp-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gcp-6.17 | 6.17.0-1008.8~24.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1052.55~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gke | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1048.53 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-gkeop | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1035.38 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-hwe-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-106.106~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-ibm | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1049.49 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1049.49~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-intel-iotg | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-kvm | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-lowlatency | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-106.106.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-106.106.1~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1049.52 | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-nvidia-6.17 | 6.17.0-1008.8 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1049.52~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1049.52.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1020.20 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oem-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oem-6.17 | 6.17.0-1011.11 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oracle | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1047.48 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-oracle | 6.17.0-1007.7 | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oracle-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-oracle-6.17 | 6.17.0-1007.7~24.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1047.48~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-raspi | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1050.54 | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-raspi | 6.17.0-1008.8 | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-realtime | 6.17.0-1006.7 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:25.10 | linux-riscv | 6.17.0-14.14.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-riscv-6.14 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-106.106~22.04.1 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2025-40198 |
| Ubuntu:24.04:LTS | linux-xilinx | 6.8.0-1028.29 | UBUNTU-CVE-2025-40198 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | no fix listed | UBUNTU-CVE-2025-40198 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 8b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before 7bf46ff83a0ef11836e38ebd72cdc5107209342d8b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before b2bac84fde28fb6a88817b8b761abda17a1d300b8b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before e651294218d2684302ee5ed95ccf381646f3e5b48b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before 01829af7656b56d83682b3491265d583d502e5028b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before 2a0cf438320cdb783e0378570744c0ef0d83e9348b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before a6e94557cd05adc82fae0400f6e17745563e54128b67f04ab9de5d8f3a71aef72bf02c995a506db5 – before 8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8 |
| Linux | Linux | 2.6.36 |
References
- https://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d
- https://git.kernel.org/stable/c/b2bac84fde28fb6a88817b8b761abda17a1d300b
- https://git.kernel.org/stable/c/e651294218d2684302ee5ed95ccf381646f3e5b4
- https://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502
- https://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934
- https://git.kernel.org/stable/c/a6e94557cd05adc82fae0400f6e17745563e5412
- https://git.kernel.org/stable/c/8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8