{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98169", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.322Z", "datePublished": "2026-10-06T08:44:14.339Z", "dateUpdated": "2026-10-19T09:15:00.713Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:15:00.713Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential OOB read in smb3_enum_snapshots()\n\nIf snapshot_array_size is smaller than GMT_TOKEN_SIZE,\nsmb3_enum_snapshots() sets ret_data_len to\nsizeof(struct smb_snapshot_array) without verifying the actual length\nof the server's reply.\n\nBecause SMB2_ioctl() places no lower bound on the server-supplied\nOutputCount and allocates retbuf to exactly that length, a short reply\nresults in ret_data_len exceeding the size of retbuf. The subsequent\ncopy_to_user() then reads past the end of retbuf, leaking adjacent slab\nmemory to userspace. The subsequent clamp check is ineffective as it\nonly reduces ret_data_len.\n\nFix this by rejecting replies shorter than\nsizeof(struct smb_snapshot_array) with -EIO. Note that the bound is set\nto the 12-byte struct size rather than the 16-byte\nMIN_SNAPSHOT_ARRAY_SIZE defined in MS-SMB2 3.3.5.15.1, because 12 bytes\nis exactly what copy_to_user() attempts to read." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bad input is the OutputCount field of the SMB2 IOCTL response to FSCTL_SRV_ENUMERATE_SNAPSHOTS, sent by the SMB server over TCP. SMB2_ioctl() rejects only 0 or oversized values and kmemdup()s 1-11 bytes, and smb3_enum_snapshots() then copies 12 bytes from that buffer.\nAC:L - A server that always answers the snapshot FSCTL with OutputCount 1-11 hits the bug every time a caller passes snapshot_array_size < GMT_TOKEN_SIZE, which is the normal first sizing query. No race or memory layout outside the server's control is needed.\nPR:N - The attacker is the SMB server answering the client's request. It needs no account or privilege on the client to send a short IOCTL response.\nUI:R - A victim has to mount the attacker's share, and a process on the client has to issue ioctl(CIFS_ENUMERATE_SNAPSHOTS) on a file there to make smb3_enum_snapshots() run.\nS:U - The out-of-bounds read and the crash both stay inside the client kernel. No VM, IOMMU or other security boundary is crossed.\nC:L - copy_to_user() reads at most 11 bytes past the kmemdup'd retbuf, from the next kmalloc-8 object or the unused tail of a kmalloc-16 object. The leak is small and fixed in size, and it goes to the ioctl caller, not back over the wire.\nI:N - The defect is a read only: retbuf is copied out to user space, and no kernel memory is written out of bounds.\nA:H - With CONFIG_HARDENED_USERCOPY (common on distro and Android kernels), a 12-byte copy_to_user() from a kmalloc-8 retbuf (OutputCount 1-8) fails the heap object check. usercopy_abort() then calls BUG() and the kernel oopses, or panics if panic_on_oops is set. The server can trigger this on every enumeration." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2ops.c" ], "versions": [ { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "15a221c734b9d044ab769e7e3606b2cab96fb65a", "status": "affected", "versionType": "git" }, { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "74995ee8305a7c4d76ee70d6acd996a75eda3c03", "status": "affected", "versionType": "git" }, { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "210f0f1f67817e7d2348b86b5115a9b85ef5c98b", "status": "affected", "versionType": "git" }, { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "1cdf0d304d820fb13bf0faf532c3459600f9ea43", "status": "affected", "versionType": "git" }, { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "dbe452a905dfe2804647530a9ff3d7e3826ed04d", "status": "affected", "versionType": "git" }, { "version": "e02789a53d71334b067ad72eee5d4e88a0158083", "lessThan": "4775c3b7a597907e0b97556c7986fda238a377ae", "status": "affected", "versionType": "git" }, { "version": "a94703ff8e3647f8a9a3a92a468450299a7b77e9", "status": "affected", "versionType": "git" }, { "version": "82a856f527334ffd69aae26e7dd9e03b19c4a520", "status": "affected", "versionType": "git" }, { "version": "25b981bfe192fd208ba04c81f4aa30ffb5141660", "status": "affected", "versionType": "git" }, { "version": "4.9.125", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.68", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.18.6", "lessThan": "4.19", "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/smb/client/smb2ops.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.8", "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": "4.19", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.125" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/15a221c734b9d044ab769e7e3606b2cab96fb65a" }, { "url": "https://git.kernel.org/stable/c/74995ee8305a7c4d76ee70d6acd996a75eda3c03" }, { "url": "https://git.kernel.org/stable/c/210f0f1f67817e7d2348b86b5115a9b85ef5c98b" }, { "url": "https://git.kernel.org/stable/c/1cdf0d304d820fb13bf0faf532c3459600f9ea43" }, { "url": "https://git.kernel.org/stable/c/dbe452a905dfe2804647530a9ff3d7e3826ed04d" }, { "url": "https://git.kernel.org/stable/c/4775c3b7a597907e0b97556c7986fda238a377ae" } ], "title": "smb: client: fix potential OOB read in smb3_enum_snapshots()", "x_generator": { "engine": "bippy-1.2.0" } } } }