FKIE_CVE-2025-38710
Vulnerability from fkie_nvd - Published: 2025-09-04 16:15 - Updated: 2026-10-19 21:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/
Summary
In the Linux kernel, the following vulnerability has been resolved:
gfs2: Validate i_depth for exhash directories
A fuzzer test introduced corruption that ends up with a depth of 0 in
dir_e_read(), causing an undefined shift by 32 at:
index = hash >> (32 - dip->i_depth);
As calculated in an open-coded way in dir_make_exhash(), the minimum
depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is
invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time.
So we can avoid the undefined behaviour by checking for depth values
lower than the minimum in gfs2_dinode_in(). Values greater than the
maximum are already being checked for there.
Also switch the calculation in dir_make_exhash() to use ilog2() to
clarify how the depth is calculated.
Tested with the syzkaller repro.c and xfstests '-g quick'.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/gfs2/dir.c",
"fs/gfs2/glops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "076e992752e4b24178918f748d75597c80a408d2",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "366183911b153e9b8cf758e1414e1154d7569337",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "112bb60cd0e254a369e95aa9941a694ffeca089f",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "cddea0c721106ea480371412d8de21705eb27376",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "53a0249d68a210c16e961b83adfa82f94ee0a53d",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "b5f46951e62377b6e406fadc18bc3c5bdf1632a7",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "9680c58675b82348ab84d387e4fa727f7587e1a0",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
},
{
"lessThan": "557c024ca7250bb65ae60f16c02074106c2f197b",
"status": "affected",
"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/gfs2/dir.c",
"fs/gfs2/glops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.26"
},
{
"lessThan": "2.6.26",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.43",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"version": "6.15.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1936DB45-ECC5-4A1A-A924-0D4E14DFE578",
"versionEndExcluding": "6.12.43",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BC242347-F722-43AE-B910-BE0B22386977",
"versionEndExcluding": "6.15.11",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899",
"versionEndExcluding": "6.16.2",
"versionStartIncluding": "6.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Validate i_depth for exhash directories\n\nA fuzzer test introduced corruption that ends up with a depth of 0 in\ndir_e_read(), causing an undefined shift by 32 at:\n\n index = hash \u003e\u003e (32 - dip-\u003ei_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp-\u003esd_hash_ptrs) and 0 is\ninvalid as sdp-\u003esd_hash_ptrs is fixed as sdp-\u003ebsize / 16 at mount time.\n\nSo we can avoid the undefined behaviour by checking for depth values\nlower than the minimum in gfs2_dinode_in(). Values greater than the\nmaximum are already being checked for there.\n\nAlso switch the calculation in dir_make_exhash() to use ilog2() to\nclarify how the depth is calculated.\n\nTested with the syzkaller repro.c and xfstests \u0027-g quick\u0027."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\ngfs2: Validar i_depth para directorios exhash\n\nUna prueba de fuzzer introdujo corrupci\u00f3n que resulta en una profundidad de 0 en dir_e_read(), causando un desplazamiento indefinido de 32 en:\n\nindex = hash \u003e\u003e (32 - dip-\u003ei_depth);\n\nSeg\u00fan se calcula de forma abierta en dir_make_exhash(), la profundidad m\u00ednima para un directorio exhash es ilog2(sdp-\u003esd_hash_ptrs) y 0 no es v\u00e1lido ya que sdp-\u003esd_hash_ptrs se fija como sdp-\u003ebsize / 16 en el momento del montaje.\n\nAs\u00ed podemos evitar el comportamiento indefinido comprobando los valores de profundidad inferiores al m\u00ednimo en gfs2_dinode_in(). Los valores mayores que el m\u00e1ximo ya se est\u00e1n comprobando all\u00ed.\n\nTambi\u00e9n cambiar el c\u00e1lculo en dir_make_exhash() para usar ilog2() para clarificar c\u00f3mo se calcula la profundidad.\n\nProbado con syzkaller repro.c y xfstests \u0027-g quick\u0027."
}
],
"id": "CVE-2025-38710",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-38710",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-15T21:52:51.698031Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-09-04T16:15:40.137",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/076e992752e4b24178918f748d75597c80a408d2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/112bb60cd0e254a369e95aa9941a694ffeca089f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/366183911b153e9b8cf758e1414e1154d7569337"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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