312 lines
15 KiB
JSON
312 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46185",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.103Z",
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"datePublished": "2026-05-28T09:36:39.318Z",
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"dateUpdated": "2026-10-19T19:36:54.280Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:30:18.630Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix out-of-bounds read in symlink_data()\n\nSince smb2_check_message() returns success without length validation for\nthe symlink error response, in symlink_data() it is possible for\niov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer\nonly contains the base SMB2 header (64 bytes), accessing\nerr->ErrorContextCount (at offset 66) or err->ByteCount later in\nsymlink_data() will cause an out-of-bounds read."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerability is in the SMB *client*, triggered by a crafted symlink error response from a remote (malicious, compromised, or MITM) SMB server over TCP/445; it processes attacker-controlled data from a remote network peer.\nAC:L - A malicious server can deterministically return a CREATE response with STATUS_STOPPED_ON_SYMLINK and len < calc_len (e.g., only the 64-byte base header), reliably reaching symlink_data() with no race or attacker-uncontrolled condition.\nPR:N - The attacker is the remote SMB server; it requires no credentials or privileges on the victim client to send the malformed response, which is parsed during normal open/error handling.\nUI:N - Once a share is mounted (e.g., persistent fstab/autofs mount to a compromised or MITM'd server), routine file access makes the server return the crafted symlink error with no additional victim action required per exploit.\nS:U - The out-of-bounds read stays within the client kernel's own memory and security authority; no privilege or sandbox boundary is crossed.\nC:H - An out-of-bounds read of adjacent kernel heap memory; in this same symlink-parse path (cf. CVE-2026-31613) OOB bytes are UTF-16-decoded into the symlink target and returned to userspace via readlink(2).\nI:N - The flaw is purely an out-of-bounds read of the error response buffer; it does not modify kernel memory.\nA:H - Reading past the message bounds can dereference invalid/unmapped memory and oops the client kernel, causing a denial of service."
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}
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]
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}
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],
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"affected": [
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/client/smb2misc.c"
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],
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"version": "2d046892a493d9760c35fdaefc3017f27f91b621",
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"status": "affected",
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{
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"version": "6.0.16",
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"lessThan": "6.1",
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"status": "affected",
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"fs/smb/client/smb2misc.c"
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],
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"versions": [
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{
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{
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"version": "0",
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"lessThan": "6.1",
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"status": "unaffected",
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},
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{
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"version": "6.1.175",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.140",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.88",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.30",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.7",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"url": "https://git.kernel.org/stable/c/b8c8a704f0bc133deb171f6aeb6f3a684203e212"
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"url": "https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20"
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}
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],
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"title": "smb/client: fix out-of-bounds read in symlink_data()",
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"x_generator": {
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:21:09.431Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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"content": {
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"id": "CVE-2026-46185",
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"role": "CISA Coordinator",
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"options": [
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{
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},
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:20:54.231422Z"
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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}
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} |