264 lines
13 KiB
JSON
264 lines
13 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-2026-23226",
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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": "2026-01-13T15:37:45.987Z",
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"datePublished": "2026-02-18T14:53:29.562Z",
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"dateUpdated": "2026-10-30T12:23:51.650Z"
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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": "2026-10-30T12:23:51.650Z"
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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: add chann_lock to protect ksmbd_chann_list xarray\n\nksmbd_chann_list xarray lacks synchronization, allowing use-after-free in\nmulti-channel sessions (between lookup_chann_list() and ksmbd_chann_del).\n\nAdds rw_semaphore chann_lock to struct ksmbd_session and protects\nall xa_load/xa_store/xa_erase accesses."
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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 the in-kernel SMB server listening on TCP port 445, directly reachable over the network.\nAC:L - The attacker controls both sides of the race by establishing multiple SMB connections (multi-channel session) and timing a disconnect on one while the other accesses the channel list. The attacker creates and controls the race condition.\nPR:L - The channel list is populated during ntlm_authenticate() or krb5_authenticate(), requiring valid SMB credentials to establish a session before the race can be triggered. This is post-authentication.\nUI:N - No user interaction is needed; the attacker initiates and controls all SMB connections and their timing.\nS:U - The vulnerability and its impact remain within the kernel security authority; no security boundary (e.g., VM, sandbox) is crossed.\nC:H - Use-after-free on struct channel allows reading freed memory that may be reallocated with attacker-controlled content, enabling arbitrary kernel memory disclosure including signing keys.\nI:H - Use-after-free enables heap spraying to replace the freed channel struct, allowing attacker-controlled data to be used as signing keys or function pointers, leading to arbitrary code execution.\nA:H - Use-after-free reliably causes kernel crashes (oops/panic) when the freed channel pointer is dereferenced, causing 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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{
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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/mgmt/user_session.h",
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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": "91bbf9cb2387a0d76322e9a343bc6bc160f66b3f",
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"lessThan": "c00f3938f7ac52770907768e440cf253af9cbb63",
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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": "1d9c4172110e645b383ff13eee759728d74f1a5d",
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"lessThan": "43ad494ac6e940a8eabf25d5bd77bb3bb53b1153",
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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": "1d9c4172110e645b383ff13eee759728d74f1a5d",
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"lessThan": "4c2ca31608521895dd742a43beca4b4d29762345",
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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": "1d9c4172110e645b383ff13eee759728d74f1a5d",
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"lessThan": "e4a8a96a93d08570e0405cfd989a8a07e5b6ff33",
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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": "1d9c4172110e645b383ff13eee759728d74f1a5d",
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"lessThan": "36ef605c0395b94b826a8c8d6f2697071173de6e",
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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": "1d9c4172110e645b383ff13eee759728d74f1a5d",
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"lessThan": "4f3a06cc57976cafa8c6f716646be6c79a99e485",
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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": "b1caecbf34b8c8260d851ec4efde71f3694460b7",
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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": "853c416710b075153c1e1421e099ffbe5dac68ce",
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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": "6.1.29",
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"lessThan": "6.1.191",
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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": "5.15.145",
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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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"version": "6.2.16",
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"lessThan": "6.3",
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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/mgmt/user_session.h",
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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": "6.3",
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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": "6.3",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.77",
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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": "6.18.11",
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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": "6.19.1",
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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": "6.1.29",
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"versionEndExcluding": "6.1.191"
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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": "6.3",
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"versionEndExcluding": "6.6.160"
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"versionEndExcluding": "6.12.77"
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"versionStartIncluding": "5.15.145"
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},
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{
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"vulnerable": true,
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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/c00f3938f7ac52770907768e440cf253af9cbb63"
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},
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{
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"url": "https://git.kernel.org/stable/c/43ad494ac6e940a8eabf25d5bd77bb3bb53b1153"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c2ca31608521895dd742a43beca4b4d29762345"
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},
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{
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"url": "https://git.kernel.org/stable/c/e4a8a96a93d08570e0405cfd989a8a07e5b6ff33"
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},
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{
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"url": "https://git.kernel.org/stable/c/36ef605c0395b94b826a8c8d6f2697071173de6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f3a06cc57976cafa8c6f716646be6c79a99e485"
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}
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],
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"title": "ksmbd: add chann_lock to protect ksmbd_chann_list xarray",
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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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} |