{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-23189",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-01-13T15:37:45.985Z",
        "datePublished": "2026-02-14T16:27:17.549Z",
        "dateUpdated": "2026-05-23T16:04:05.037Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-23T16:04:05.037Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix NULL pointer dereference in ceph_mds_auth_match()\n\nThe CephFS kernel client has regression starting from 6.18-rc1.\nWe have issue in ceph_mds_auth_match() if fs_name == NULL:\n\n    const char fs_name = mdsc->fsc->mount_options->mds_namespace;\n    ...\n    if (auth->match.fs_name && strcmp(auth->match.fs_name, fs_name)) {\n            / fsname mismatch, try next one */\n            return 0;\n    }\n\nPatrick Donnelly suggested that: In summary, we should definitely start\ndecoding `fs_name` from the MDSMap and do strict authorizations checks\nagainst it. Note that the `-o mds_namespace=foo` should only be used for\nselecting the file system to mount and nothing else. It's possible\nno mds_namespace is specified but the kernel will mount the only\nfile system that exists which may have name \"foo\".\n\nThis patch reworks ceph_mdsmap_decode() and namespace_equals() with\nthe goal of supporting the suggested concept. Now struct ceph_mdsmap\ncontains m_fs_name field that receives copy of extracted FS name\nby ceph_extract_encoded_string(). For the case of \"old\" CephFS file\nsystems, it is used \"cephfs\" name.\n\n[ idryomov: replace redundant %*pE with %s in ceph_mdsmap_decode(),\n  get rid of a series of strlen() calls in ceph_namespace_match(),\n  drop changes to namespace_equals() body to avoid treating empty\n  mds_namespace as equal, drop changes to ceph_mdsc_handle_fsmap()\n  as namespace_equals() isn't an equivalent substitution there ]"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/mds_client.c",
                        "fs/ceph/mdsmap.c",
                        "fs/ceph/mdsmap.h",
                        "fs/ceph/super.h",
                        "include/linux/ceph/ceph_fs.h"
                    ],
                    "versions": [
                        {
                            "version": "07640d34a781bb2e39020a39137073c03c4aa932",
                            "lessThan": "c6f8326f26bd20d648d9a55afd68148d1b6afe28",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "22c73d52a6d05c5a2053385c0d6cd9984732799d",
                            "lessThan": "57b36ffc8881dd455d875f85c105901974af2130",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "22c73d52a6d05c5a2053385c0d6cd9984732799d",
                            "lessThan": "7987cce375ac8ce98e170a77aa2399f2cf6eb99f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ca3da8b27ab9a0923ad477447cfb8fc7f4b4c523",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.12.58",
                            "lessThan": "6.12.70",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.8",
                            "lessThan": "6.18",
                            "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/ceph/mds_client.c",
                        "fs/ceph/mdsmap.c",
                        "fs/ceph/mdsmap.h",
                        "fs/ceph/super.h",
                        "include/linux/ceph/ceph_fs.h"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.70",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.10",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "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": "6.12.58",
                                    "versionEndExcluding": "6.12.70"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.18.10"
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                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
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                                {
                                    "vulnerable": true,
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                                    "versionStartIncluding": "6.17.8"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c6f8326f26bd20d648d9a55afd68148d1b6afe28"
                },
                {
                    "url": "https://git.kernel.org/stable/c/57b36ffc8881dd455d875f85c105901974af2130"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7987cce375ac8ce98e170a77aa2399f2cf6eb99f"
                }
            ],
            "title": "ceph: fix NULL pointer dereference in ceph_mds_auth_match()",
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