CVE-2025-40198
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-11-12 22:15:46.923000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-40198",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-11-12T22:15:46.923",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid potential buffer over-read in parse_apply_sb_mount_options()\n\nUnlike other strings in the ext4 superblock, we rely on tune2fs to\nmake sure s_mount_opts is NUL terminated. Harden\nparse_apply_sb_mount_options() by treating s_mount_opts as a potential\n__nonstring."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\next4: evitar una potencial lectura excesiva del búfer en parse_apply_sb_mount_options()\n\nA diferencia de otras cadenas en el superbloque ext4, dependemos de tune2fs para asegurar que s_mount_opts esté terminado en NUL. Reforzar parse_apply_sb_mount_options() tratando s_mount_opts como una potencial __nonstring."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/ext4/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "7bf46ff83a0ef11836e38ebd72cdc5107209342d",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "b2bac84fde28fb6a88817b8b761abda17a1d300b",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "e651294218d2684302ee5ed95ccf381646f3e5b4",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "01829af7656b56d83682b3491265d583d502e502",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "2a0cf438320cdb783e0378570744c0ef0d83e934",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "a6e94557cd05adc82fae0400f6e17745563e5412",
"versionType": "git",
"status": "affected"
},
{
"version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
"lessThan": "8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/ext4/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "2.6.36",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.36",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.4.301",
"lessThanOrEqual": "5.4.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.246",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.158",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.114",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.54",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.4",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-15T21:57:54.146489Z",
"id": "CVE-2025-40198",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a6e94557cd05adc82fae0400f6e17745563e5412",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b2bac84fde28fb6a88817b8b761abda17a1d300b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e651294218d2684302ee5ed95ccf381646f3e5b4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}