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-2026-74435",
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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": "2026-08-15T05:44:03.896Z",
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"datePublished": "2026-08-15T05:59:34.073Z",
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"dateUpdated": "2026-08-17T05:47:09.898Z"
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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": "2026-08-17T05:47:09.898Z"
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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\nrxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc\n\nrxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the\nrxrpc_call.rx_dec_buffer is unallocated and assumes that upon\nsuccessful return that rx_dec_buffer must be allocated.\nHowever, rxrpc_verify_data() does not request an allocation if\nthe rxrpc_skb_priv.len is zero.\n\nIn addition, failure to allocate rx_dec_buffer will result in a\ncall to skb_copy_bits() with a NULL destination which can\ntrigger a NULL pointer dereference.\n\nTo prevent these issues rxrpc_verify_data() is modified to\nalways attempt to allocate the rxrpc_call.rx_dec_buffer if it\nis NULL.\n\nThis issue was identified with assistance of a private\nsashiko instance."
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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 - RxRPC runs over UDP/IP; a remote peer can deliver crafted DATA packets that are queued on the receive path and later processed in rxrpc_verify_data() via recvmsg/kernel_recv_data, with no local access required.\nAC:L - An attacker can reliably trigger the bug by sending a zero-length RxRPC DATA packet (header-only skb so sp->len==0) to a listening service; no races or victim-specific state are needed beyond an active RxRPC/AFS endpoint.\nPR:N - Incoming DATA packets are accepted and queued on new calls before Kerberos authentication completes, so an unauthenticated remote attacker can reach the vulnerable recvmsg path on internet-facing AFS/RxRPC servers without any local privileges.\nUI:N - On AFS/RxRPC servers the kernel automatically receives network DATA, queues it, and invokes rxrpc_kernel_recv_data through service callbacks; exploitation requires no victim user action such as mounting a filesystem or opening a file.\nS:U - The flaw causes a kernel NULL pointer dereference during in-kernel packet processing on the same host running the RxRPC/AFS service; it does not cross a VM, container, or IOMMU security boundary.\nC:N - The failure mode is a NULL pointer dereference in skb_copy_bits()/subsequent recvmsg handling when rx_dec_buffer was never allocated; this is a pure crash path with no demonstrated or plausible arbitrary kernel memory read or information disclosure.\nI:N - No memory corruption, arbitrary write, or code-execution primitive is introduced; the bug dereferences a NULL decryption buffer during receive processing and results in kernel oops/panic rather than controlled data modification.\nA:H - A successful trigger causes a kernel NULL pointer dereference during recvmsg data verification/decryption, which can oops or panic the host and deny service to all workloads on affected AFS/RxRPC servers until reboot."
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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/rxrpc/recvmsg.c"
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],
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"versions": [
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{
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"version": "a05bf6d9e621fa71e89ccebe3047ba45218d7b38",
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"lessThan": "8bbede0afced346b24e4fbde0c68cf12980ba948",
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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": "b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5",
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"lessThan": "6563b4eb38c35d75892445bcf8aacdc29914821c",
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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": "46cb765e2e5ad52303ea157e10d370bb6b7acbbf",
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"lessThan": "d3b642cf95d48234590cc91450d8705a9bf6b540",
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"status": "affected",
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"versionType": "git"
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"version": "d2bc90cf6c75cb96d2ce549be6c35efa3099d25b",
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"lessThan": "a962bc8508592c4d51092edac68579bd8b18fe44",
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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": "d2bc90cf6c75cb96d2ce549be6c35efa3099d25b",
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"lessThan": "16c8ae9735c5bd7e54dd7478d6348e0fc860842d",
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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": "c580087743712112778a06d65a4074053072d7bf",
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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": "6.6.143",
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"lessThan": "6.6.145",
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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": "6.12.93",
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"lessThan": "6.12.97",
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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": "6.18.35",
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"lessThan": "6.18.40",
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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": "7.0.11",
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"lessThan": "7.1",
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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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"net/rxrpc/recvmsg.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "7.1",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"operator": "OR",
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"negate": false,
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.143",
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"versionEndExcluding": "6.6.145"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.12.97"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948"
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},
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{
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"url": "https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540"
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},
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{
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"url": "https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44"
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},
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{
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"url": "https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d"
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}
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],
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"title": "rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc",
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