222 lines
13 KiB
JSON
222 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-2026-90235",
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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": "2026-09-11T19:38:34.794Z",
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"datePublished": "2026-09-17T16:07:41.251Z",
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"dateUpdated": "2026-10-30T12:34:53.963Z"
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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": "2026-10-30T12:34:53.963Z"
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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\nsunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE\n\nxprtsock replaces and restores sk->sk_data_ready and\nsk->sk_write_space on live sockets with plain stores, and\nxs_udp_do_set_buffer_size() invokes sk->sk_write_space via a plain\nload. These callback pointers are shared with generic socket and\nprotocol paths that may read or invoke them concurrently, so xprtsock\nneeds the same READ_ONCE()/WRITE_ONCE() callback visibility contract\nthat the validated 4022 family applied elsewhere.\n\nWhen SUNRPC takes over an AF_LOCAL, UDP, or TCP socket and later\nrestores the lower-socket callbacks during teardown, another CPU may\nstill hold an earlier callback snapshot. The plain replace/restore\npattern leaves the same visibility hole as the validated 4022 family,\nso a stale snapshot can still invoke xs_data_ready() or\nxs_udp_write_space() after the live callback fields have already been\nrestored to the lower-socket handlers.\n\nUse WRITE_ONCE() for the shared sk_data_ready and sk_write_space\nstores in xs_local_finish_connecting(), xs_udp_finish_connecting(),\nxs_tcp_finish_connecting(), and xs_restore_old_callbacks(). Use\nREAD_ONCE() for the direct sk_write_space invocation in\nxs_udp_do_set_buffer_size(). This matches the required callback\nvisibility contract while leaving adjacent sk_state_change and\nsk_error_report handling unchanged."
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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 - NFSv4.0 SETCLIENTID/SETCLIENTID_CONFIRM (nfsd4_setclientid → gen_callback → setup_callback_client with XPRT_TRANSPORT_TCP) makes nfsd run xs_tcp_finish_connecting; the peer's callback TCP segments hit READ_ONCE(sk_data_ready) in tcp_data_queue and READ_ONCE(sk_write_space) in sock_wfree. NFS client RPC-over-TCP/UDP replies use the same xprtsock callbacks.\nAC:L - The attacker drives both sides: SETCLIENTID_CONFIRM then a later SETCLIENTID or TCP RST forces xs_tcp_finish_connecting versus xs_restore_old_callbacks (nfsd4_process_cb_update → rpc_shutdown_client → xs_reset_transport), while concurrent callback replies and TX skb frees take sock_wfree's lockless sk_write_space snapshot. The race is retryable on new callback sockets.\nPR:N - SETCLIENTID and SETCLIENTID_CONFIRM are ALLOWED_WITHOUT_FH. Typical nfsd deployments accept AUTH_SYS/AUTH_NULL, so a remote peer that can reach TCP/2049 needs no local account or capability on the NFS server to create and tear down the callback xprtsock.\nUI:N - The attacker sends SETCLIENTID/SETCLIENTID_CONFIRM and the callback-channel TCP segments itself. No victim mount or other interactive action is required beyond nfsd already serving NFSv4.0.\nS:U - Stale xs_data_ready or xs_udp_write_space running against a torn-down sock_xprt corrupts kernel memory on the host that owns the RPC socket. This is not a guest-to-host, IOMMU, or other cross-authority escape.\nC:H - A stale xs_data_ready after xs_restore_old_callbacks can still see a non-NULL sk_user_data via xprt_from_sock and call transport->old_data_ready plus read sock_xprt fields, leaking kernel heap once that xprt is reused or freed.\nI:H - The same callback/user_data desync lets xs_write_space queue_work on a freed recv_worker/error_worker and decrement sk_write_pending while xs_reset_transport is in __fput_sync, giving an arbitrary kernel write and control-flow hijack.\nA:H - Use-after-free of sock_xprt in xs_data_ready, xs_udp_write_space, or xs_tcp_write_space from sock_wfree or tcp_data_queue after xs_restore_old_callbacks oopses or panics the kernel even without a full write primitive."
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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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"net/sunrpc/xprtsock.c"
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],
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"versions": [
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{
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"version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "6b79b5a0f1c566f0aa6e08c7981826015a0acc4d",
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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": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "ed80d009b154aa204f541d390884851b3d4f15ae",
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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": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "589f761236e05ff9de1bdfd6a5258f113e6457fe",
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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": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "da652cb17f9faeea1fa44b7215e8869a0b10b664",
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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": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "d8f0b83753809761a560c4b33249388548ba6e43",
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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": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
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"lessThan": "33930840b5f0a79f826e7c69dc6cd78f72a67481",
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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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"net/sunrpc/xprtsock.c"
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],
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"versions": [
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{
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"version": "2.6.15",
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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": "2.6.15",
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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": "6.1.191",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "2.6.15",
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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": "2.6.15",
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"versionEndExcluding": "6.6.157"
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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": "2.6.15",
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"versionEndExcluding": "6.12.110"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.15",
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"versionEndExcluding": "6.18.52"
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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": "2.6.15",
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"versionEndExcluding": "7.2.6"
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{
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"versionEndExcluding": "7.3"
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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/6b79b5a0f1c566f0aa6e08c7981826015a0acc4d"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae"
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},
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{
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"url": "https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664"
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},
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{
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"url": "https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43"
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},
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{
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"url": "https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481"
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}
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],
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"title": "sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE",
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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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} |