CVE-2026-89779

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89779", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.765Z", "datePublished": "2026-09-16T08:48:19.083Z", "dateUpdated": "2026-10-19T08:52:31.490Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:52:31.490Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea() only checks\nthat the record fits in the remaining buffer (ea_size > bytes), not that\nef->size is large enough to hold the record's own name_len + 1 + elength.\n\nA crafted image can pass validation with, e.g., ef->size = 24 but\nelength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of\nthe undersized record, reading past the kmalloc(info->size) allocation\nand leaking heap memory to userspace via getxattr():\n\n BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)\n Read of size 65535 at addr ffff888100794550 by task exploit\n __asan_memcpy (mm/kasan/shadow.c:105)\n ntfs_get_ea (fs/ntfs3/xattr.c:302)\n ntfs_getxattr (fs/ntfs3/xattr.c:848)\n __vfs_getxattr (fs/xattr.c:441)\n vfs_getxattr (fs/xattr.c:474)\n do_getxattr (fs/xattr.c:800)\n path_getxattrat (fs/xattr.c:868)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n\n The buggy address is located 80 bytes inside of\n allocated 84-byte region in cache kmalloc-96\n\nCompute the size the record needs and require ef->size to cover it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - ntfs3 registers export_operations and an empty-prefix xattr handler, so ksmbd SMB2 QUERY_INFO FILE_FULL_EA and nfsd GETXATTR reach vfs_getxattr\u2192ntfs_getxattr\u2192ntfs_get_ea on an exported NTFS volume; a crafted EA named user.* is listed and returned over the network on NAS/hybrid SMB/NFS servers.\nAC:L - The attacker fully controls on-disk EA_FULL fields; ef->size=24 with elength=0xffff passes ntfs_read_ea() and makes ntfs_get_ea() memcpy 65535 bytes past the kmalloc(info->size) object deterministically, with no race or attacker-uncontrollable layout.\nPR:N - The leak needs only read access to a file carrying the crafted EA: a ksmbd guest/anonymous client with FILE_READ_EA, an NFSv4 AUTH_SYS/guest GETXATTR, or automount of attacker media, with no local account or CAP_SYS_ADMIN on the host.\nUI:N - After the NTFS volume is mounted and exported\u2014the normal state for NAS, dual-boot, and automounted removable NTFS\u2014the attacker issues SMB QUERY_INFO, NFS GETXATTR, or getxattr(2) themselves; no further victim clicks, prompts, or confirmations are required.\nS:U - The slab over-read and heap leak occur in the host kernel ntfs3 xattr path under a single security authority; this is standard filesystem exploitation, not a VM escape, IOMMU/DMA bypass, or other cross-boundary breakout.\nC:H - ntfs_get_ea() copies attacker-chosen elength (up to 65535) bytes from past the kmalloc(info->size) EA buffer into the getxattr output that VFS, ksmbd, and nfsd return to the caller; a ~64KiB kernel-heap leak to userspace or a remote SMB/NFS client is Confidentiality High.\nI:N - The destination is sized from the probed elength (ksmbd/nfsd) or the caller-supplied size with an explicit len>size ERANGE check, so this is a source over-read into a bounds-checked xattr buffer, not an out-of-bounds write, UAF, or control-flow hijack primitive.\nA:H - KASAN reports a 65535-byte slab-out-of-bounds read in ntfs_get_ea from an 84-byte kmalloc-96 object; that unbounded heap over-read can fault unmapped adjacent slab pages and oops or panic the kernel, which is Availability High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/xattr.c"], "versions": [{"version": "333feb7ba84f69f9b423422417aaac54fd9e7c84", "lessThan": "b27e68ad818a4ca2cef8f35f97e75d756714c818", "status": "affected", "versionType": "git"}, {"version": "000a9a72efa4a9df289bab9c9e8ba1639c72e0d6", "lessThan": "28a924c7e67e6d71abeb04860b61166fecb027fc", "status": "affected", "versionType": "git"}, {"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "lessThan": "d585ed08308909c7e6fefb4e8a258aeb29b19ff9", "status": "affected", "versionType": "git"}, {"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "lessThan": "077df8464cf24f8ffc82fb6efec2ae600686e699", "status": "affected", "versionType": "git"}, {"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "lessThan": "aab1880058ac767d3ea9388a9a7221c776c22c44", "status": "affected", "versionType": "git"}, {"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "lessThan": "c8a109c9e23a2c7fd548473dde728b2cb8188146", "status": "affected", "versionType": "git"}, {"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "lessThan": "c22f91d82cb9a29d22bdffdce6c803467984ad0c", "status": "affected", "versionType": "git"}, {"version": "5.15.121", "lessThan": "5.15.221", "status": "affected", "versionType": "semver"}, {"version": "6.1.40", "lessThan": "6.1.188", "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/ntfs3/xattr.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "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": "5.15.121", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.40", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818"}, {"url": "https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc"}, {"url": "https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9"}, {"url": "https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699"}, {"url": "https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44"}, {"url": "https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146"}, {"url": "https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c"}], "title": "fs/ntfs3: validate ef->size covers the record's name and value", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs3/xattr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b27e68ad818a4ca2cef8f35f97e75d756714c818", "status": "affected", "version": "333feb7ba84f69f9b423422417aaac54fd9e7c84", "versionType": "git"}, {"lessThan": "28a924c7e67e6d71abeb04860b61166fecb027fc", "status": "affected", "version": "000a9a72efa4a9df289bab9c9e8ba1639c72e0d6", "versionType": "git"}, {"lessThan": "d585ed08308909c7e6fefb4e8a258aeb29b19ff9", "status": "affected", "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "versionType": "git"}, {"lessThan": "077df8464cf24f8ffc82fb6efec2ae600686e699", "status": "affected", "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "versionType": "git"}, {"lessThan": "aab1880058ac767d3ea9388a9a7221c776c22c44", "status": "affected", "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "versionType": "git"}, {"lessThan": "c8a109c9e23a2c7fd548473dde728b2cb8188146", "status": "affected", "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "versionType": "git"}, {"lessThan": "c22f91d82cb9a29d22bdffdce6c803467984ad0c", "status": "affected", "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b", "versionType": "git"}, {"lessThan": "5.15.221", "status": "affected", "version": "5.15.121", "versionType": "semver"}, {"lessThan": "6.1.188", "status": "affected", "version": "6.1.40", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs3/xattr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"lessThan": "6.2", "status": "unaffected", "version": "0", "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\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea() only checks\nthat the record fits in the remaining buffer (ea_size > bytes), not that\nef->size is large enough to hold the record's own name_len + 1 + elength.\n\nA crafted image can pass validation with, e.g., ef->size = 24 but\nelength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of\nthe undersized record, reading past the kmalloc(info->size) allocation\nand leaking heap memory to userspace via getxattr():\n\n BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)\n Read of size 65535 at addr ffff888100794550 by task exploit\n __asan_memcpy (mm/kasan/shadow.c:105)\n ntfs_get_ea (fs/ntfs3/xattr.c:302)\n ntfs_getxattr (fs/ntfs3/xattr.c:848)\n __vfs_getxattr (fs/xattr.c:441)\n vfs_getxattr (fs/xattr.c:474)\n do_getxattr (fs/xattr.c:800)\n path_getxattrat (fs/xattr.c:868)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n\n The buggy address is located 80 bytes inside of\n allocated 84-byte region in cache kmalloc-96\n\nCompute the size the record needs and require ef->size to cover it."}], "id": "CVE-2026-89779", "lastModified": "2026-10-19T09:18:21.247", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T09:17:08.387", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[333feb7ba84f69f9b423422417aaac54fd9e7c84,b27e68ad818a4ca2cef8f35f97e75d756714c818)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[000a9a72efa4a9df289bab9c9e8ba1639c72e0d6,28a924c7e67e6d71abeb04860b61166fecb027fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b,d585ed08308909c7e6fefb4e8a258aeb29b19ff9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b,077df8464cf24f8ffc82fb6efec2ae600686e699)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b,aab1880058ac767d3ea9388a9a7221c776c22c44)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b,c8a109c9e23a2c7fd548473dde728b2cb8188146)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b,c22f91d82cb9a29d22bdffdce6c803467984ad0c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.121,5.15.221)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.40,6.1.188)"}}], "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": "6.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.2.*]"}}, {"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": "2026-09-16T16:15:16.864197+00:00", "updated": "2026-09-20T04:45:17.012862+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125"]}