CVE-2025-38710

{"id": "CVE-2025-38710", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38710", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:52:51.698031Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "076e992752e4b24178918f748d75597c80a408d2", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "366183911b153e9b8cf758e1414e1154d7569337", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "112bb60cd0e254a369e95aa9941a694ffeca089f", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "cddea0c721106ea480371412d8de21705eb27376", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "53a0249d68a210c16e961b83adfa82f94ee0a53d", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "b5f46951e62377b6e406fadc18bc3c5bdf1632a7", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "9680c58675b82348ab84d387e4fa727f7587e1a0", "versionType": "git"}, {"status": "affected", "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab", "lessThan": "557c024ca7250bb65ae60f16c02074106c2f197b", "versionType": "git"}], "programFiles": ["fs/gfs2/dir.c", "fs/gfs2/glops.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.26"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.26", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.43", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.11", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16.2", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/gfs2/dir.c", "fs/gfs2/glops.c"], "defaultStatus": "affected"}]}], "published": "2025-09-04T16:15:40.137", "references": [{"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"}, {"url": "https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "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 >> (32 - dip->i_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is\ninvalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 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 '-g quick'."}, {"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 >> (32 - dip->i_depth);\n\nSeg\u00fan se calcula de forma abierta en dir_make_exhash(), la profundidad m\u00ednima para un directorio exhash es ilog2(sdp->sd_hash_ptrs) y 0 no es v\u00e1lido ya que sdp->sd_hash_ptrs se fija como sdp->bsize / 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 '-g quick'."}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1936DB45-ECC5-4A1A-A924-0D4E14DFE578", "versionEndExcluding": "6.12.43"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BC242347-F722-43AE-B910-BE0B22386977", "versionEndExcluding": "6.15.11", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899", "versionEndExcluding": "6.16.2", "versionStartIncluding": "6.16"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}