{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46185", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.103Z", "datePublished": "2026-05-28T09:36:39.318Z", "dateUpdated": "2026-08-05T12:30:18.630Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:18.630Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2misc.c" ], "versions": [ { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "2be11faf79e49fb8250a181ff0b4d2b2f084af83", "status": "affected", "versionType": "git" }, { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "ef6495d4df6e7af8f3de67e65150881c880f696c", "status": "affected", "versionType": "git" }, { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "15dc0a4de743a1aaa7b859b3aea79f08c695396c", "status": "affected", "versionType": "git" }, { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "b8c8a704f0bc133deb171f6aeb6f3a684203e212", "status": "affected", "versionType": "git" }, { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "b9561402489d41149f63e001a74384863b7b30a6", "status": "affected", "versionType": "git" }, { "version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "d62b8d236fab503c6fec1d3e9a38bea71feaca20", "status": "affected", "versionType": "git" }, { "version": "2d046892a493d9760c35fdaefc3017f27f91b621", "status": "affected", "versionType": "git" }, { "version": "6.0.16", "lessThan": "6.1", "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/smb2misc.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "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", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2be11faf79e49fb8250a181ff0b4d2b2f084af83" }, { "url": "https://git.kernel.org/stable/c/ef6495d4df6e7af8f3de67e65150881c880f696c" }, { "url": "https://git.kernel.org/stable/c/15dc0a4de743a1aaa7b859b3aea79f08c695396c" }, { "url": "https://git.kernel.org/stable/c/b8c8a704f0bc133deb171f6aeb6f3a684203e212" }, { "url": "https://git.kernel.org/stable/c/b9561402489d41149f63e001a74384863b7b30a6" }, { "url": "https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20" } ], "title": "smb/client: fix out-of-bounds read in symlink_data()", "x_generator": { "engine": "bippy-1.2.0" } } } }