{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53271",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.395Z",
        "datePublished": "2026-06-25T08:39:56.489Z",
        "dateUpdated": "2026-06-25T08:39:56.489Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-25T08:39:56.489Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix NULL-deref of opinfo->conn in oplock/lease break notifiers\n\nsmb2_oplock_break_noti() and smb2_lease_break_noti() read opinfo->conn\ninto a local with neither READ_ONCE() nor a NULL check.  Both run from\noplock_break() after opinfo_get_list() has dropped ci->m_lock, so a\nconcurrent SMB2 LOGOFF (session_fd_check()) can set op->conn = NULL\nunder ci->m_lock within that window.  ksmbd_conn_r_count_inc(conn) then\nwrites through NULL at offset 0xc4 -- a remotely triggerable oops.\n\nGuard both reads the way compare_guid_key() already does: read\nopinfo->conn with READ_ONCE() and return early if it is NULL, before\nallocating the work struct so nothing leaks.  A NULL conn means the\nclient is gone and the break is moot, so return 0; oplock_break() treats\nthat as success and runs the normal teardown."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/oplock.c"
                    ],
                    "versions": [
                        {
                            "version": "8df4bcdb0a4232192b2445256c39b787d58ef14d",
                            "lessThan": "945a86b21b40fb17183f5b27461baa6f03e2467f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "1ff58dcfcab434ebb51649da33774fbb8e1f7b67",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "e735dbd489e3ea02be78dba991056fe1138be51e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "75e33deda658c1ab3a9336cbdb1436536f9b3660",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "b003086d76968298f22e7cf62239833b5a3a06b1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.6.32",
                            "lessThan": "6.6.143",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/oplock.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.94",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.36",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.13",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6.32",
                                    "versionEndExcluding": "6.6.143"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.12.94"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.18.36"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
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                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "7.1"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/945a86b21b40fb17183f5b27461baa6f03e2467f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1ff58dcfcab434ebb51649da33774fbb8e1f7b67"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e735dbd489e3ea02be78dba991056fe1138be51e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/75e33deda658c1ab3a9336cbdb1436536f9b3660"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b003086d76968298f22e7cf62239833b5a3a06b1"
                }
            ],
            "title": "ksmbd: fix NULL-deref of opinfo->conn in oplock/lease break notifiers",
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}