CVE-2026-89782

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89782", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.765Z", "datePublished": "2026-09-16T08:48:21.093Z", "dateUpdated": "2026-10-19T08:52:34.456Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:52:34.456Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: reject restart table growth beyond U16_MAX entries\n\nDuring $LogFile replay, log_replay() indexes the transaction table by the\ntransact_id taken from the log record header. check_log_rec() only\nverifies that transact_id is non-zero and properly aligned, not its\nmagnitude, so a crafted image can request an arbitrarily large index.\n\nalloc_rsttbl_from_idx() grows the table to cover that index via\nextend_rsttbl(), which passes the new entry count to init_rsttbl():\n\n\trt = init_rsttbl(esize, used + add);\n\nused + add is computed as u32 but init_rsttbl() takes a u16, and the\ncount is stored in struct RESTART_TABLE as a __le16. When used + add\nexceeds U16_MAX it is truncated, init_rsttbl() allocates a table far\nsmaller than the index requires, and alloc_rsttbl_from_idx() then\ndereferences and writes at the original, untruncated offset -- an\nout-of-bounds access past the allocation, reachable by mounting a\ncrafted NTFS image.\n\n BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n Read of size 4 at addr ffff8880327ffff8 by task exploit\n alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n log_replay (fs/ntfs3/fslog.c:4562)\n ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324)\n ntfs_fill_super (fs/ntfs3/super.c:1393)\n get_tree_bdev_flags\n vfs_get_tree\n path_mount\n __x64_sys_mount\n\nA restart table is limited to U16_MAX entries by its __le16 count, so a\nlarger growth request is invalid input. Reject it in extend_rsttbl();\nall callers already handle a NULL return."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only while mounting a local NTFS block or loop device: path_mount \u2192 ntfs_fill_super \u2192 ntfs_loadlog_and_replay \u2192 log_replay \u2192 alloc_rsttbl_from_idx. ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - The attacker fully controls on-disk $LogFile LFS_RECORD_HDR.transact_id. check_log_rec() only requires it non-zero and TRANSACTION_ENTRY-aligned, so a crafted index with used+add > U16_MAX truncates init_rsttbl() and hits the OOB access deterministically on mount with no race.\nPR:N - No account or privilege on the victim is required: a crafted NTFS volume on USB/removable media, a disk image, or shared storage is sufficient for udisks2/systemd automount or an administrator mount to run $LogFile replay as root.\nUI:N - Desktop, kiosk, automotive, and shared-workstation automounters mount attacker-supplied NTFS media and run log_replay() inside ntfs_fill_super() without the user opening files or confirming a dialog; attaching the crafted volume is sufficient to trigger the overflow.\nS:U - Heap out-of-bounds access and use-after-free occur in the host kernel during ntfs3 journal replay in the mounting process; impact stays within one kernel security authority and is not a VM escape or IOMMU/DMA bypass.\nC:H - After the truncated allocation, alloc_rsttbl_from_idx() reads a restart-table word at the original untruncated transact_id offset (KASAN use-after-free). That attacker-chosen heap index plus UAF of the freed old table enable arbitrary kernel memory disclosure.\nI:H - extend_rsttbl() memcpy's the old table into a truncated kmalloc buffer, then alloc_rsttbl_from_idx() memset's and writes RESTART_ENTRY_ALLOCATED at the untruncated offset, producing an OOB/UAF heap write that can corrupt adjacent slab objects for control-flow hijacking.\nA:H - KASAN reported use-after-free in alloc_rsttbl_from_idx() on mount of a crafted NTFS image; the out-of-bounds heap access during log replay can oops or panic the kernel and is repeatable on every mount of the malicious volume."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/fslog.c"], "versions": [{"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "339e59996ff193adcf1c438cf05f19e753beb3a7", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "ecde45cd81dc28f5696c312c5ce5a509962e9ab1", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "be218a01aadffe33ed4fc73e25276d676ebbd09d", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "aad605a450611e2a7b7cf9dd5724004d39192bfb", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "967a5ff8a614d10126b6d46db1ac040948d6cb42", "status": "affected", "versionType": "git"}, {"version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "111f8d74a19d85942ecbb3aba78f6f3c88e59391", "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/ntfs3/fslog.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "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", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56"}, {"url": "https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7"}, {"url": "https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1"}, {"url": "https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d"}, {"url": "https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb"}, {"url": "https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42"}, {"url": "https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391"}], "title": "fs/ntfs3: reject restart table growth beyond U16_MAX entries", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs3/fslog.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "339e59996ff193adcf1c438cf05f19e753beb3a7", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "ecde45cd81dc28f5696c312c5ce5a509962e9ab1", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "be218a01aadffe33ed4fc73e25276d676ebbd09d", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "aad605a450611e2a7b7cf9dd5724004d39192bfb", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "967a5ff8a614d10126b6d46db1ac040948d6cb42", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}, {"lessThan": "111f8d74a19d85942ecbb3aba78f6f3c88e59391", "status": "affected", "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs3/fslog.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "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: reject restart table growth beyond U16_MAX entries\n\nDuring $LogFile replay, log_replay() indexes the transaction table by the\ntransact_id taken from the log record header. check_log_rec() only\nverifies that transact_id is non-zero and properly aligned, not its\nmagnitude, so a crafted image can request an arbitrarily large index.\n\nalloc_rsttbl_from_idx() grows the table to cover that index via\nextend_rsttbl(), which passes the new entry count to init_rsttbl():\n\n\trt = init_rsttbl(esize, used + add);\n\nused + add is computed as u32 but init_rsttbl() takes a u16, and the\ncount is stored in struct RESTART_TABLE as a __le16. When used + add\nexceeds U16_MAX it is truncated, init_rsttbl() allocates a table far\nsmaller than the index requires, and alloc_rsttbl_from_idx() then\ndereferences and writes at the original, untruncated offset -- an\nout-of-bounds access past the allocation, reachable by mounting a\ncrafted NTFS image.\n\n BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n Read of size 4 at addr ffff8880327ffff8 by task exploit\n alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n log_replay (fs/ntfs3/fslog.c:4562)\n ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324)\n ntfs_fill_super (fs/ntfs3/super.c:1393)\n get_tree_bdev_flags\n vfs_get_tree\n path_mount\n __x64_sys_mount\n\nA restart table is limited to U16_MAX entries by its __le16 count, so a\nlarger growth request is invalid input. Reject it in extend_rsttbl();\nall callers already handle a NULL return."}], "id": "CVE-2026-89782", "lastModified": "2026-10-19T09:18:21.663", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T09:17:08.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,339e59996ff193adcf1c438cf05f19e753beb3a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,ecde45cd81dc28f5696c312c5ce5a509962e9ab1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,be218a01aadffe33ed4fc73e25276d676ebbd09d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,aad605a450611e2a7b7cf9dd5724004d39192bfb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,967a5ff8a614d10126b6d46db1ac040948d6cb42)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b46acd6a6a627d876898e1c84d3f84902264b445,111f8d74a19d85942ecbb3aba78f6f3c88e59391)"}}], "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": "generic", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15)"}}, {"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": "[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": "2026-09-16T13:30:10.615059+00:00", "updated": "2026-09-20T04:45:17.000244+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119"]}