217 lines
11 KiB
JSON
217 lines
11 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-2026-31717",
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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": "2026-03-09T15:48:24.134Z",
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"datePublished": "2026-05-01T13:56:12.012Z",
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"dateUpdated": "2026-08-05T12:24:48.598Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:24:48.598Z"
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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\nksmbd: validate owner of durable handle on reconnect\n\nCurrently, ksmbd does not verify if the user attempting to reconnect\nto a durable handle is the same user who originally opened the file.\nThis allows any authenticated user to hijack an orphaned durable handle\nby predicting or brute-forcing the persistent ID.\n\nAccording to MS-SMB2, the server MUST verify that the SecurityContext\nof the reconnect request matches the SecurityContext associated with\nthe existing open.\nAdd a durable_owner structure to ksmbd_file to store the original opener's\nUID, GID, and account name. and catpure the owner information when a file\nhandle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner()\nto validate the identity of the requester during SMB2_CREATE (DHnC)."
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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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 - ksmbd is an in-kernel SMB server reachable over the network via SMB requests, including SMB2 CREATE durable-handle reconnects.\nAC:L - Exploitation does not require a race or conditions outside attacker control; an attacker can send reconnect requests and predict or brute-force the global persistent ID in a reasonable multi-user durable-handle deployment.\nPR:L - The SMB2 CREATE path requires a valid authenticated session and tree connection before reaching the vulnerable durable reconnect logic. The flaw allows any authenticated SMB user to hijack another user's orphaned durable handle.\nUI:N - No victim interaction is required at exploit time; the attacker sends network SMB requests directly to the server.\nS:U - The impact remains within the ksmbd/file-server security authority and does not cross a VM, sandbox, or hardware isolation boundary.\nC:H - A hijacked durable handle can be used to read victim-opened files using the original handle's access rights, bypassing normal open-time ACL checks. This can expose full contents of sensitive files.\nI:H - The reconnected handle reuses the original `fp->daccess`, so if the victim handle had write, set-info, rename, truncate, or delete rights, the attacker can modify victim data with those rights.\nA:H - The attacker can steal or close the durable handle and, when the original handle carries write/delete/truncate rights, render victim data or critical shared files unavailable."
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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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{
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"product": "Linux",
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"vendor": "Linux",
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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/server/mgmt/user_session.c",
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"fs/smb/server/oplock.c",
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"fs/smb/server/oplock.h",
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"fs/smb/server/smb2pdu.c",
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"fs/smb/server/vfs_cache.c",
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"fs/smb/server/vfs_cache.h"
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],
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"versions": [
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{
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"lessThan": "712cdf917e77a6444ce3836874829d770db20ee6",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d",
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"status": "affected",
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"lessThan": "00ce8d6789dae72d042a4522264964c72891ca37",
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"status": "affected",
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
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"lessThan": "49110a8ce654bbe56bef7c5e44cce31f4b102b8a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.6.32",
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"lessThan": "6.6.142",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/server/mgmt/user_session.c",
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"fs/smb/server/oplock.c",
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"fs/smb/server/oplock.h",
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"fs/smb/server/smb2pdu.c",
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"fs/smb/server/vfs_cache.c",
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"fs/smb/server/vfs_cache.h"
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],
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"versions": [
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{
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"version": "6.9",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.9",
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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": "6.6.142",
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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": "6.12.92",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.25",
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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": "7.0.2",
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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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],
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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/712cdf917e77a6444ce3836874829d770db20ee6"
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{
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}
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],
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"title": "ksmbd: validate owner of durable handle on reconnect",
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