274 lines
14 KiB
JSON
274 lines
14 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-31705",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-03-09T15:48:24.132Z",
|
|
"datePublished": "2026-05-01T13:56:03.896Z",
|
|
"dateUpdated": "2026-10-15T01:18:03.133Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T12:24:39.919Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment\n\nsmb2_get_ea() applies 4-byte alignment padding via memset() after\nwriting each EA entry. The bounds check on buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check on remaining space.\n\nWhen the EA value exactly fills the remaining buffer (buf_free_len == 0\nafter value subtraction), the alignment memset writes 1-3 NUL bytes\npast the buf_free_len boundary. In compound requests where the response\nbuffer is shared across commands, the first command (e.g., READ) can\nconsume most of the buffer, leaving a tight remainder for the QUERY_INFO\nEA response. The alignment memset then overwrites past the physical\nkvmalloc allocation into adjacent kernel heap memory.\n\nAdd a bounds check before the alignment memset to ensure buf_free_len\ncan accommodate the padding bytes.\n\nThis is the same bug pattern fixed by commit beef2634f81f (\"ksmbd: fix\npotencial OOB in get_file_all_info() for compound requests\") and\ncommit fda9522ed6af (\"ksmbd: fix OOB write in QUERY_INFO for compound\nrequests\"), both of which added bounds checks before unconditional\nwrites in QUERY_INFO response handlers."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 9.8,
|
|
"baseSeverity": "CRITICAL"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:N - ksmbd processes SMB2 requests over TCP, typically port 445, and the vulnerable `SMB2_QUERY_INFO` EA path is reachable through network packets from a remote SMB client.\nAC:L - The attacker can craft the compound response-buffer exhaustion and EA length/alignment conditions through SMB requests and controlled xattr sizes; there is no race or external condition beyond attacker control.\nPR:N - Although `SMB2_QUERY_INFO` is after session and tree setup, ksmbd supports guest/anonymous sessions and guest-accessible shares, so a reasonable deployment can expose this path without authenticated credentials.\nUI:N - No victim action is required after the server is running and exposing the share; the attacker sends SMB requests directly.\nS:U - The corruption occurs inside the kernel SMB server and impacts the same kernel/host security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:H - This is kernel heap memory corruption from an out-of-bounds write; in the highest defensible case it can be leveraged toward kernel code execution or primitives that expose arbitrary kernel data.\nI:H - The bug is an out-of-bounds write of attacker-reached data into adjacent kernel heap memory, which is high integrity impact under the kernel scoring guidance.\nA:H - The out-of-bounds heap write can corrupt kernel memory and crash or panic the system, and it can be triggered remotely and repeatedly through SMB."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/smb/server/smb2pdu.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77",
|
|
"lessThan": "ddbbc8b2a09dd2cfed90871313e3691ae1db08a2",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
|
|
"lessThan": "ffbce350c6fd1e99116ea57383b9031717e36d3b",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
|
|
"lessThan": "98f3de6ef4efbd899348d333f0902dc4ff14380c",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
|
|
"lessThan": "790304c02bf9bd7b8171feda4294d6e62d32ae8f",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
|
|
"lessThan": "922d48fe8c19f388ffa2f709f33acaae4e408de2",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
|
|
"lessThan": "30010c952077a1c89ecdd71fc4d574c75a8f5617",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "f2283680a80571ca82d710bc6ecd8f8beac67d63",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "6.1.71",
|
|
"lessThan": "6.1.175",
|
|
"status": "affected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.145",
|
|
"lessThan": "5.16",
|
|
"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/server/smb2pdu.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.6",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.6",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.175",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.136",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.84",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.25",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.0.2",
|
|
"lessThanOrEqual": "7.0.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.1",
|
|
"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": "6.1.71",
|
|
"versionEndExcluding": "6.1.175"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.6",
|
|
"versionEndExcluding": "6.6.136"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.6",
|
|
"versionEndExcluding": "6.12.84"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.6",
|
|
"versionEndExcluding": "6.18.25"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.6",
|
|
"versionEndExcluding": "7.0.2"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.6",
|
|
"versionEndExcluding": "7.1"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.15.145"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ddbbc8b2a09dd2cfed90871313e3691ae1db08a2"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ffbce350c6fd1e99116ea57383b9031717e36d3b"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/98f3de6ef4efbd899348d333f0902dc4ff14380c"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/790304c02bf9bd7b8171feda4294d6e62d32ae8f"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/922d48fe8c19f388ffa2f709f33acaae4e408de2"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/30010c952077a1c89ecdd71fc4d574c75a8f5617"
|
|
}
|
|
],
|
|
"title": "ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"x_adpType": "supplier",
|
|
"providerMetadata": {
|
|
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
|
|
"shortName": "siemens-SADP",
|
|
"dateUpdated": "2026-10-15T01:18:03.133Z"
|
|
},
|
|
"affected": [
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "0",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |