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vuln-cve/data/2026/98xxx/CVE-2026-98169.json
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{
"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": "2026-10-30T12:37:47.892Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:37:47.892Z"
},
"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": [
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"versionType": "git"
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"status": "affected",
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},
{
"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"
},
{
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"lessThan": "4.19",
"status": "affected",
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}
]
},
{
"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": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
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},
{
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},
{
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"status": "unaffected",
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},
{
"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": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/67ef1d6da00f4f39eb5fcebe7a44fe494b645059"
},
{
"url": "https://git.kernel.org/stable/c/5edf5b398d49b881c0df79d6e4f6df251236c533"
},
{
"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"
}
}
}
}
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