HighFix available
ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.246, 5.4.301, 6.1.158, 6.12.54, 6.17.4, 6.6.114
- CVEs
- CVE-2025-40198
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 19:35 UTC · Revision 1
Source evidence
ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
core-osv · Original sourcePublished 12 Nov 2025, 21:56 UTC
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.
osv:CVE-2025-40198
Kernel
Fixed versions: 5.4.301, 5.10.246, 6.1.158, 6.6.114, 6.12.54, 6.17.4
Complete source record
{
"id": "365e954ba8eb9500f1c01301b79d7a532b153291da13cbff93644d1b5cc259fd",
"url": "https://osv.dev/vulnerability/CVE-2025-40198",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()",
"summary": "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.",
"evidence": "osv:CVE-2025-40198",
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{
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"severity": "high",
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"id": "CVE-2025-40198",
"aliases": [
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
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"affected": [
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"package": {
"name": "Kernel",
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"database_specific": {
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],
"modified": "2026-10-28T02:30:38.543955479Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502",
"https://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934",
"https://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d",
"https://git.kernel.org/stable/c/8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8",
"https://git.kernel.org/stable/c/a6e94557cd05adc82fae0400f6e17745563e5412",
"https://git.kernel.org/stable/c/b2bac84fde28fb6a88817b8b761abda17a1d300b",
"https://git.kernel.org/stable/c/e651294218d2684302ee5ed95ccf381646f3e5b4",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40198.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-40198",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40198.json"
}
},
"related_cves": [
{
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"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506233,
"published_at": "2025-11-12T21:56:33.22+00:00"
}