235 lines
12 KiB
JSON
235 lines
12 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-2025-40285",
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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": "2025-04-16T07:20:57.184Z",
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"datePublished": "2025-12-06T21:51:09.590Z",
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"dateUpdated": "2026-08-05T12:09:15.214Z"
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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": "2026-08-05T12:09:15.214Z"
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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/server: fix possible refcount leak in smb2_sess_setup()\n\nReference count of ksmbd_session will leak when session need reconnect.\nFix this by adding the missing ksmbd_user_session_put()."
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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 the in-kernel SMB server on TCP/445, and the leak is driven entirely by remote SMB2 SESSION_SETUP and LOGOFF PDUs on the attacker's own TCP connections. No local access to the target is required.\nAC:L - The attacker controls both sides of the race — it pipelines the SESSION_SETUP requests that take the reference and issues the LOGOFF/PreviousSessionId request that flips conn->status to NEED_RECONNECT — and the window is wide because ksmbd_conn_wait_idle()/ksmbd_conn_wait_idle_sess_id() hold that status for the duration of the teardown (up to 120 s). Failed attempts are harmless and can be retried indefinitely.\nPR:N - smb2_check_user_session() explicitly bypasses session validation for SMB2_SESSION_SETUP, and the session is registered in conn->sessions before any credential check, so the leaking lookup is reached with zero credentials. On the common guest-mapped ksmbd share, ntlm_authenticate() skips password verification for user_guest(), so the LOGOFF that flips the connection to NEED_RECONNECT is also available unauthenticated.\nUI:N - The attacker opens its own connections and issues every request itself; no legitimate user or administrator action is involved.\nS:U - The leaked session object and its pinned file references are kernel resources within the same security authority as the ksmbd server; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - Nothing is read out of bounds and nothing is transmitted back to the client on this error path — the only effect is that a reference count is never decremented, so no kernel data is disclosed.\nI:N - No memory is written out of bounds or freed early; the object simply outlives its intended lifetime, so no kernel data or control flow is modified.\nA:H - Each won race permanently leaks a struct ksmbd_session plus its entire file table, so open struct file/inode/dentry references are pinned forever (also blocking unmount), and the attack is replayable without limit over surviving connections, driving unbounded kernel memory and handle exhaustion to OOM and system hang."
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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/smb2pdu.c"
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],
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"versions": [
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{
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"version": "37a0e2b362b3150317fb6e2139de67b1e29ae5ff",
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"lessThan": "6fc935f798d44a8eb8a5e6659198399fbf57b981",
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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": "450a844c045ff0895d41b05a1cbe8febd1acfcfd",
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"lessThan": "e671f9bb97805771380c98de944e2ceab6949188",
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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": "a39e31e22a535d47b14656a7d6a893c7f6cf758c",
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"lessThan": "dcc51dfe6ff26b52cac106865a172ac982d78401",
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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": "b95629435b84b9ecc0c765995204a4d8a913ed52",
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"lessThan": "d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d",
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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": "b95629435b84b9ecc0c765995204a4d8a913ed52",
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"lessThan": "379510a815cb2e64eb0a379cb62295d6ade65df0",
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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": "2107ab40629aeabbec369cf34b8cf0f288c3eb1b",
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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": "6.1.121",
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"lessThan": "6.1.159",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.67",
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"lessThan": "6.6.117",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.6",
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"lessThan": "6.12.59",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.176",
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"lessThan": "5.16",
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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/smb2pdu.c"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.1.159",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.117",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.59",
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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": "6.17.9",
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"lessThanOrEqual": "6.17.*",
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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",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.121",
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"versionEndExcluding": "6.1.159"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.67",
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"versionEndExcluding": "6.6.117"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.6",
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"versionEndExcluding": "6.12.59"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.17.9"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.18"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981"
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},
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{
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"url": "https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188"
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},
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{
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"url": "https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401"
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},
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{
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"url": "https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d"
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},
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{
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"url": "https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0"
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}
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],
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"title": "smb/server: fix possible refcount leak in smb2_sess_setup()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |