CVE-2026-43379

{"id": "CVE-2026-43379", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "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": "27b40b7bfcd121fe13a150ffe11957630cf49246", "lessThan": "bf4d66d72e4a9e268c1012c331ce9eaedb5e2086", "versionType": "git"}, {"status": "affected", "version": "5fb282ba4fef8985a5acf2b32681f2ec07732561", "lessThan": "960699317d39f46611f4ebeb69edc567c1f4e6b6", "versionType": "git"}, {"status": "affected", "version": "5fb282ba4fef8985a5acf2b32681f2ec07732561", "lessThan": "dbbd328cf58261ca239756fe1c0d10c9518d3399", "versionType": "git"}, {"status": "affected", "version": "5fb282ba4fef8985a5acf2b32681f2ec07732561", "lessThan": "b3568347c51c46e2cabc356bc34676df98296619", "versionType": "git"}, {"status": "affected", "version": "5fb282ba4fef8985a5acf2b32681f2ec07732561", "lessThan": "eac3361e3d5dd8067b3258c69615888eb45e9f25", "versionType": "git"}, {"status": "affected", "version": "6.6.32", "lessThan": "6.6.130", "versionType": "semver"}], "programFiles": ["fs/smb/server/oplock.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"status": "unaffected", "version": "0", "lessThan": "6.9", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.78", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.19", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.9", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/oplock.c"], "defaultStatus": "affected"}]}], "published": "2026-05-08T15:16:49.100", "references": [{"url": "https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-free."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nksmbd: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en smb_lazy_parent_lease_break_close()\n\nEl puntero opinfo obtenido a trav\u00e9s de rcu_dereference(fp -> f_opinfo) est\u00e1 siendo accedido despu\u00e9s de que se haya llamado a rcu_read_unlock(). Esto crea una condici\u00f3n de carrera donde la memoria podr\u00eda ser liberada por un escritor concurrente entre la liberaci\u00f3n del bloqueo y las subsiguientes desreferencias del puntero (opinfo -> is_lease, etc.), lo que lleva a un uso despu\u00e9s de liberaci\u00f3n."}], "lastModified": "2026-11-11T20:10:00.273", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D1E711D7-AEFA-4401-A4BA-765B56DBA77E", "versionEndExcluding": "6.6.130", "versionStartIncluding": "6.6.32"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D1D90B78-24E3-418D-A238-3FE23C32239B", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D394AC60-6F28-435F-872A-CCDF384B8331", "versionEndExcluding": "6.18.19", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}