CVE-2026-93095

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93095", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.084Z", "datePublished": "2026-09-17T16:11:09.694Z", "dateUpdated": "2026-10-19T09:05:28.487Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:05:28.487Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: validate thread record before delete key rebuild\n\nhfsplus_delete_cat() is called with str == NULL when the last open\nreference to an unlinked HFS+ hardlink backing inode is closed. In that\ncase, the function finds the catalog thread by CNID and rebuilds the\ncatalog key from thread.nodeName.\n\nThat reconstruction path reads thread.nodeName.length directly from the\ncatalog B-tree into fd.search_key and then copies length * 2 bytes into\nfd.search_key->cat.name.unicode. It does not first check that the found\nrecord is a thread record or that its size matches the thread name.\n\nA corrupted image can therefore provide an oversized thread name length\nand make hfs_bnode_read() write past the catalog search-key allocation.\n\nRead the CNID record through hfsplus_brec_read_cat(), which bounds the\nrecord read to sizeof(hfsplus_cat_entry) and verifies that a thread\nrecord's size exactly matches nodeName.length. Together, these checks\nensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread\nrecords before building the delete key from the validated thread name.\n\nShare the thread-record-type helper between hfsplus_find_cat() and\nhfsplus_delete_cat()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The malformed value is on-disk catalog thread.nodeName.length. unlink(2) reaches it via do_unlinkat \u2192 vfs_unlink \u2192 hfsplus_unlink, and close via hfsplus_file_release; both call hfsplus_delete_cat() with str==NULL so hfs_bnode_read() copies that length into fd.search_key. This is local block/loop/USB VFS data, not a ksmbd/nfsd/packet field.\nAC:L - A crafted HFS+ catalog thread with nodeName.length above HFSPLUS_MAX_STRLEN (255) makes hfs_bnode_read() write length*2 bytes into fd.search_key->cat.name.unicode, which hfs_find_init() allocated as only cat_tree->max_key_len*2+4 bytes (~1036). The overflow is deterministic on unlink/close of that hardlink backing inode; no race or uninfluenced layout is required.\nPR:L - hfsplus_fs_type is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so raw mount(2) needs CAP_SYS_ADMIN, but the highest-impact case is an unprivileged user whose USB/loop HFS+ image is mounted by udisks2/polkit or a desktop automounter. After mount, may_delete_dentry only requires MAY_WRITE|MAY_EXEC on the attacker-owned directory.\nUI:N - The attacker supplies the crafted volume and then issues unlink(2) or close on the hardlink themselves. Automount of that local/removable image is not a separate victim action once the vector is Local.\nS:U - The hfs_find_init() kmalloc overflow and any resulting kernel memory corruption stay inside the host kernel that is parsing the HFS+ catalog B-tree. No KVM/Xen guest-to-host, IOMMU, or sandbox boundary is crossed.\nC:H - hfs_bnode_read() copies attacker-chosen catalog bytes past the search-key object into adjacent heap. That out-of-bounds write is a memory-corruption primitive that can be leveraged for arbitrary kernel-memory disclosure.\nI:H - The same unbounded write from hfs_bnode_read() into the hfs_find_init() search-key allocation overwrites neighboring slab objects, which is sufficient for an arbitrary kernel write and control-flow hijacking.\nA:H - Writing past the ~1036-byte search-key object oopses or panics the kernel (slab-out-of-bounds or GP fault) while cat_tree->tree_lock is held, crashing the machine or wedging further HFS+ operations."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/hfsplus/catalog.c", "fs/hfsplus/hfsplus_fs.h"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "33cda0036bc683fc888c20b04a5fc030e3e8413b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b9729c51a8b67f8b20b8a8cf395da4be63a0c15b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "af48abc1b00d865c3f4c4d76b901c44115cb7162", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e20f3b749ad241df77ec1c3e13a9c22209aa1eb3", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7898beee166c1145c0bca364d687b8437435bf1a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e31985c67ba00a59d9b1340af473c1dbe6c87856", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "473ea7aa35615829f0de7a71e8691d69dc24e328", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20", "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/hfsplus/catalog.c", "fs/hfsplus/hfsplus_fs.h"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.12", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/33cda0036bc683fc888c20b04a5fc030e3e8413b"}, {"url": "https://git.kernel.org/stable/c/b9729c51a8b67f8b20b8a8cf395da4be63a0c15b"}, {"url": "https://git.kernel.org/stable/c/af48abc1b00d865c3f4c4d76b901c44115cb7162"}, {"url": "https://git.kernel.org/stable/c/e20f3b749ad241df77ec1c3e13a9c22209aa1eb3"}, {"url": "https://git.kernel.org/stable/c/7898beee166c1145c0bca364d687b8437435bf1a"}, {"url": "https://git.kernel.org/stable/c/e31985c67ba00a59d9b1340af473c1dbe6c87856"}, {"url": "https://git.kernel.org/stable/c/473ea7aa35615829f0de7a71e8691d69dc24e328"}, {"url": "https://git.kernel.org/stable/c/e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20"}], "title": "hfsplus: validate thread record before delete key rebuild", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/hfsplus/catalog.c", "fs/hfsplus/hfsplus_fs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "33cda0036bc683fc888c20b04a5fc030e3e8413b", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "b9729c51a8b67f8b20b8a8cf395da4be63a0c15b", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "af48abc1b00d865c3f4c4d76b901c44115cb7162", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "e20f3b749ad241df77ec1c3e13a9c22209aa1eb3", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "7898beee166c1145c0bca364d687b8437435bf1a", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "e31985c67ba00a59d9b1340af473c1dbe6c87856", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "473ea7aa35615829f0de7a71e8691d69dc24e328", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/hfsplus/catalog.c", "fs/hfsplus/hfsplus_fs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"lessThan": "2.6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: validate thread record before delete key rebuild\n\nhfsplus_delete_cat() is called with str == NULL when the last open\nreference to an unlinked HFS+ hardlink backing inode is closed. In that\ncase, the function finds the catalog thread by CNID and rebuilds the\ncatalog key from thread.nodeName.\n\nThat reconstruction path reads thread.nodeName.length directly from the\ncatalog B-tree into fd.search_key and then copies length * 2 bytes into\nfd.search_key->cat.name.unicode. It does not first check that the found\nrecord is a thread record or that its size matches the thread name.\n\nA corrupted image can therefore provide an oversized thread name length\nand make hfs_bnode_read() write past the catalog search-key allocation.\n\nRead the CNID record through hfsplus_brec_read_cat(), which bounds the\nrecord read to sizeof(hfsplus_cat_entry) and verifies that a thread\nrecord's size exactly matches nodeName.length. Together, these checks\nensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread\nrecords before building the delete key from the validated thread name.\n\nShare the thread-record-type helper between hfsplus_find_cat() and\nhfsplus_delete_cat()."}], "id": "CVE-2026-93095", "lastModified": "2026-10-19T10:16:59.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:18:03.557", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/33cda0036bc683fc888c20b04a5fc030e3e8413b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/473ea7aa35615829f0de7a71e8691d69dc24e328"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7898beee166c1145c0bca364d687b8437435bf1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af48abc1b00d865c3f4c4d76b901c44115cb7162"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b9729c51a8b67f8b20b8a8cf395da4be63a0c15b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e20f3b749ad241df77ec1c3e13a9c22209aa1eb3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e31985c67ba00a59d9b1340af473c1dbe6c87856"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,33cda0036bc683fc888c20b04a5fc030e3e8413b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b9729c51a8b67f8b20b8a8cf395da4be63a0c15b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,af48abc1b00d865c3f4c4d76b901c44115cb7162)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e20f3b749ad241df77ec1c3e13a9c22209aa1eb3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7898beee166c1145c0bca364d687b8437435bf1a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e31985c67ba00a59d9b1340af473c1dbe6c87856)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,473ea7aa35615829f0de7a71e8691d69dc24e328)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.270,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T07:30:17.073115+00:00", "updated": "2026-09-20T00:15:06.457099+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119"]}