CVE-2026-43376

{"id": "CVE-2026-43376", "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": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6", "lessThan": "302fef75512b2c8329a3f5efab1ae7ba2562387a", "versionType": "git"}, {"status": "affected", "version": "d54ab1520d43e95f9b2e22d7a05fc9614192e5a5", "lessThan": "08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c", "versionType": "git"}, {"status": "affected", "version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7", "lessThan": "1d6abf145615dbfe267ce3b0a271f95e3780e18e", "versionType": "git"}, {"status": "affected", "version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7", "lessThan": "ce8507ee82c888126d8e7565e27c016308d24cde", "versionType": "git"}, {"status": "affected", "version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7", "lessThan": "1dfd062caa165ec9d7ee0823087930f3ab8a6294", "versionType": "git"}, {"status": "affected", "version": "d73686367ad68534257cd88a36ca3c52cb8b81d8", "versionType": "git"}, {"status": "affected", "version": "6.6.88", "lessThan": "6.6.130", "versionType": "semver"}, {"status": "affected", "version": "6.12.25", "lessThan": "6.12.78", "versionType": "semver"}, {"status": "affected", "version": "6.14.4", "lessThan": "6.15", "versionType": "semver"}], "programFiles": ["fs/smb/server/oplock.c", "fs/smb/server/oplock.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"status": "unaffected", "version": "0", "lessThan": "6.15", "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", "fs/smb/server/oplock.h"], "defaultStatus": "affected"}]}], "published": "2026-05-08T15:16:48.760", "references": [{"url": "https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde", "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 by using call_rcu() for oplock_info\n\nksmbd currently frees oplock_info immediately using kfree(), even\nthough it is accessed under RCU read-side critical sections in places\nlike opinfo_get() and proc_show_files().\n\nSince there is no RCU grace period delay between nullifying the pointer\nand freeing the memory, a reader can still access oplock_info\nstructure after it has been freed. This can leads to a use-after-free\nespecially in opinfo_get() where atomic_inc_not_zero() is called on\nalready freed memory.\n\nFix this by switching to deferred freeing using call_rcu()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: corregir uso despu\u00e9s de liberaci\u00f3n mediante el uso de call_rcu() para oplock_info\n\nksmbd actualmente libera oplock_info inmediatamente usando kfree(), a pesar de que se accede a ella bajo secciones cr\u00edticas de lectura de RCU en lugares como opinfo_get() y proc_show_files().\n\nDado que no hay un retraso del per\u00edodo de gracia de RCU entre la anulaci\u00f3n del puntero y la liberaci\u00f3n de la memoria, un lector a\u00fan puede acceder a la estructura oplock_info despu\u00e9s de que haya sido liberada. Esto puede llevar a un uso despu\u00e9s de liberaci\u00f3n, especialmente en opinfo_get() donde se llama a atomic_inc_not_zero() en memoria ya liberada.\n\nCorregir esto cambiando a la liberaci\u00f3n diferida usando call_rcu()."}], "lastModified": "2026-11-11T20:10:00.273", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "784F219C-5AC7-4D62-AAA6-D30BEF8B27D0", "versionEndExcluding": "6.6.130", "versionStartIncluding": "6.6.88"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "14D96C06-81A5-4885-A783-0D73032A376C", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.12.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "786E593C-5048-4AE0-9421-71BE44AB6058", "versionEndExcluding": "6.15", "versionStartIncluding": "6.14.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B5AFB3C9-B84F-4E20-BC69-DBDBF6A1FA0F", "versionEndExcluding": "6.18.19", "versionStartIncluding": "6.15.1"}, {"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:6.15:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "90320558-E553-4EF5-8A0B-0F5D20113BD2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C300BA32-5854-4B59-A00A-18A402F291D0"}, {"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"}