{"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": "2026-02-14T16:27:17.549Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-02-14T16:27:17.549Z"}, "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"}]}, {"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.8"}]}]}], "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()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "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 ]"}], "id": "CVE-2026-23189", "lastModified": "2026-02-14T17:15:56.703", "metrics": {}, "published": "2026-02-14T17:15:56.703", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/57b36ffc8881dd455d875f85c105901974af2130"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7987cce375ac8ce98e170a77aa2399f2cf6eb99f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6f8326f26bd20d648d9a55afd68148d1b6afe28"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}