{"api_version":"1","generated_at":"2026-09-13T04:36:18+00:00","cve":"CVE-2026-89652","urls":{"html":"https://cve.report/CVE-2026-89652","api":"https://cve.report/api/cve/CVE-2026-89652.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89652","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89652"},"summary":{"title":"ceph: bound copied dentry name length in NFS export get_name","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound copied dentry name length in NFS export get_name\n\nceph_get_name() copies the MDS-supplied name into the caller's\nNAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)\nand then writes name[rinfo->dname_len] = 0, without checking dname_len\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply\nwith dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies\nrde->name / rde->name_len the same unchecked way.\n\nImpact: a malicious or compromised Ceph MDS overflows the NAME_MAX name\nbuffer in a client's NFS-export get_name path, a slab out-of-bounds write\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.\n\nAdd ceph_export_copy_name(), which rejects lengths above NAME_MAX with\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and\n__get_snap_name().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:51","updated_at":"2026-09-11 20:19:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae","name":"https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6","name":"https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec","name":"https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a","name":"https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89652","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89652","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 19913b4eac4a230dccb548931358398f45dabe4c 61d9f27b191b838b96b697ce0bfaee39a138243a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 19913b4eac4a230dccb548931358398f45dabe4c 06fb5e623cdc2402d6bb29be94d9beb9a826ffec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 19913b4eac4a230dccb548931358398f45dabe4c e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 19913b4eac4a230dccb548931358398f45dabe4c eff8013c5a8916613c742ae5a2cc341cb605c0ae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"89652","cve":"CVE-2026-89652","epss":"0.001680000","percentile":"0.063540000","score_date":"2026-09-12","updated_at":"2026-09-13 00:08:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ceph/export.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"61d9f27b191b838b96b697ce0bfaee39a138243a","status":"affected","version":"19913b4eac4a230dccb548931358398f45dabe4c","versionType":"git"},{"lessThan":"06fb5e623cdc2402d6bb29be94d9beb9a826ffec","status":"affected","version":"19913b4eac4a230dccb548931358398f45dabe4c","versionType":"git"},{"lessThan":"e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6","status":"affected","version":"19913b4eac4a230dccb548931358398f45dabe4c","versionType":"git"},{"lessThan":"eff8013c5a8916613c742ae5a2cc341cb605c0ae","status":"affected","version":"19913b4eac4a230dccb548931358398f45dabe4c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ceph/export.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.15"},{"lessThan":"3.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound copied dentry name length in NFS export get_name\n\nceph_get_name() copies the MDS-supplied name into the caller's\nNAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)\nand then writes name[rinfo->dname_len] = 0, without checking dname_len\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply\nwith dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies\nrde->name / rde->name_len the same unchecked way.\n\nImpact: a malicious or compromised Ceph MDS overflows the NAME_MAX name\nbuffer in a client's NFS-export get_name path, a slab out-of-bounds write\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.\n\nAdd ceph_export_copy_name(), which rejects lengths above NAME_MAX with\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and\n__get_snap_name()."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:45:42.443Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a"},{"url":"https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec"},{"url":"https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6"},{"url":"https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae"}],"title":"ceph: bound copied dentry name length in NFS export get_name","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89652","datePublished":"2026-09-11T19:45:42.443Z","dateReserved":"2026-09-11T19:38:34.742Z","dateUpdated":"2026-09-11T19:45:42.443Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:51","lastModifiedDate":"2026-09-11 20:19:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89652","Ordinal":"1","Title":"ceph: bound copied dentry name length in NFS export get_name","CVE":"CVE-2026-89652","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89652","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound copied dentry name length in NFS export get_name\n\nceph_get_name() copies the MDS-supplied name into the caller's\nNAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)\nand then writes name[rinfo->dname_len] = 0, without checking dname_len\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply\nwith dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies\nrde->name / rde->name_len the same unchecked way.\n\nImpact: a malicious or compromised Ceph MDS overflows the NAME_MAX name\nbuffer in a client's NFS-export get_name path, a slab out-of-bounds write\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.\n\nAdd ceph_export_copy_name(), which rejects lengths above NAME_MAX with\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and\n__get_snap_name().","Type":"Description","Title":"ceph: bound copied dentry name length in NFS export get_name"}]}}}