222 lines
11 KiB
JSON
222 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-2026-43378",
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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": "2026-05-01T14:12:56.006Z",
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"datePublished": "2026-05-08T14:21:27.319Z",
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"dateUpdated": "2026-08-05T12:27:38.612Z"
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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": "2026-08-05T12:27:38.612Z"
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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 use-after-free in smb2_open()\n\nThe opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is\ndereferenced after rcu_read_unlock(), creating a use-after-free\nwindow."
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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:H/A:H",
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"baseScore": 9.8,
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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 vulnerable path is ksmbd's SMB2 CREATE handler, reachable over the SMB server network listener on TCP/445 or SMB Direct. A remote client can drive the request path to `smb2_open()`.\nAC:L - The bug is a UAF window around concurrent oplock/lease state changes, and an attacker can create concurrent SMB opens/lease breaks using multiple requests or connections. Under the rule to choose higher severity when uncertain, this is Low complexity.\nPR:N - `SMB2_CREATE` requires a valid session and tree connection, but ksmbd supports guest/anonymous SMB sessions and guest shares in a reasonable deployment. In that scenario no prior credentials are required.\nUI:N - Exploitation is driven entirely by network SMB requests. No victim user action is required after the server is running.\nS:U - The vulnerability is in the kernel SMB server and impacts the same host kernel security authority. It does not inherently cross a VM, hypervisor, or separate security scope boundary.\nC:H - The flaw is a use-after-free of `struct oplock_info` and its lease data after RCU protection is dropped. Kernel UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - The dangling `oplock_info` pointer can be used after free while building the SMB2 CREATE response, creating exploitable kernel memory corruption. UAFs are treated as capable of arbitrary write or control-flow impact.\nA:H - A remotely triggerable kernel UAF can cause an oops, panic, or service crash. Repeated SMB requests can make the availability impact high."
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "e1b21e6066615e7d3d3a7aa2677e415e563fd7cc",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "b720c84087cb547f23ce03eab93568c1769e4556",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "54b48ae83de8bb06e65079d96368efe359d4909c",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "8f5b1a7cb009a93c48e9e334a2f59a660f9afc07",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "190e5f808e8058640b408ccfed25440b441a718a",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "1e689a56173827669a35da7cb2a3c78ed5c53680",
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"status": "affected",
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"versionType": "git"
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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": "5.15",
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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": "5.15",
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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": "6.1.167",
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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": "6.6.130",
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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": "6.12.78",
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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": "6.18.19",
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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": "6.19.9",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "5.15",
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"versionEndExcluding": "6.1.167"
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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": "5.15",
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"versionEndExcluding": "6.6.130"
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "6.18.19"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "6.19.9"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "7.0"
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}
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]
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}
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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/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc"
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},
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{
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"url": "https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556"
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},
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{
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"url": "https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909c"
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},
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{
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"url": "https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07"
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},
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{
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"url": "https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718a"
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},
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{
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"url": "https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680"
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}
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],
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"title": "smb: server: fix use-after-free in smb2_open()",
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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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}
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} |