272 lines
15 KiB
JSON
272 lines
15 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-2026-90002",
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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": "2026-09-11T19:38:34.780Z",
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"datePublished": "2026-09-16T10:33:12.734Z",
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"dateUpdated": "2026-10-30T12:33:46.379Z"
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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": "2026-10-30T12:33:46.379Z"
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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\nftrace: Take trace_array reference before accessing its ftrace_ops\n\nThe trace instance files set_ftrace_filter and set_ftrace_notrace was\nupdated to work with specific trace instances (trace_arrays). The issue is\nthat when these files are opened, there is a small race window where it\nwill use the ftrace_ops from the inode->private pointer to get a reference\nto the trace_array and then take its reference. The problem is that the\nftrace_ops itself could be freed. If the rmdir on the instance happens at\nthe same time the set_ftrace_filter file is opened, the rmdir could have\nalso freed the ftrace_ops and referencing it will cause a use-after-free\nbug and crash the kernel.\n\nInstead, pass in the trace_array as the file private data (NULL for the\ntop level instance), and then pass both the trace_array and the ftrace_ops\nto the ftrace_regex_open() function. If the trace_array is NULL, then it\njust uses the ftrace_ops without the need to take its reference (like\nnormal). If the ftrace_ops is NULL, that is only the case for the top\nlevel instance and the global_ops can be used.\n\nThis allows the trace_array to have its reference incremented before\ntouching the ftrace_ops that could also be freed when the instance is."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The UAF is reached only by a local open() of an instance set_ftrace_filter/set_ftrace_notrace racing rmdir of that tracing instance under /sys/kernel/tracing/instances; there is no network or adjacent-protocol path into ftrace_filter_open().\nAC:L - The attacker drives both sides: mkdir an instance, open its filter file on one thread, and rmdir it on another. instance_rmdir drops inode locks and kfree()s ftrace_ops before unlinking the files, so the race is retryable with no condition outside attacker control.\nPR:L - ftrace_regex_open()/instance mkdir/rmdir check only LOCKDOWN_TRACEFS (off by default) and DAC, with no capable() call. Android/Perfetto, ChromeOS, and distro tracing-group gid= mounts routinely grant unprivileged users write on /sys/kernel/tracing/instances.\nUI:N - The attacker performs mkdir, concurrent open of set_ftrace_filter/set_ftrace_notrace, and rmdir entirely from their own threads; no victim mount, click, or other-user action is required.\nS:U - The use-after-free is of a kmalloc'd struct ftrace_ops in the host kernel heap; any privilege escalation stays within the kernel's own security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free of heap-allocated ftrace_ops: open() reads ops->private, ops->flags, and ops->func_hash from the freed object, so after slab reclaim/spray those fields become attacker-controlled and yield an arbitrary kernel read.\nI:H - ftrace_ops_init() writes flags, func_hash, and a mutex into the freed object and later mutex_lock()s ops->func_hash->regex_lock; with spray this is an arbitrary-write primitive, and ftrace_ops also carries hijackable function pointers (func, ops_func).\nA:H - Dereferencing the freed ftrace_ops (ops->private, flags, func_hash) on the open-versus-rmdir race reliably oopses or panics the kernel, as described in the fix, and can be re-triggered by repeating instance create/open/rmdir."
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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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"include/linux/ftrace.h",
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"kernel/trace/ftrace.c",
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"kernel/trace/trace.h",
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"kernel/trace/trace_functions.c",
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"kernel/trace/trace_stack.c"
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],
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"versions": [
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{
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "0124b36a7eac1dd0402146fc6c1f732877b9cd9f",
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"status": "affected",
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"versionType": "git"
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "ffe16fe221e25cd1915602e6753c3d3285ed9a98",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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"lessThan": "29266da8ee1d9be656b1f22460c49538e1930658",
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"status": "affected",
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "177cd8966325f0ffffa3c9381f9e0422019a3973",
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"status": "affected",
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"versionType": "git"
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},
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "83fd7eca5ab0d3ac3f23bff889175d847e21af06",
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"status": "affected",
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"versionType": "git"
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{
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "cee8f286794df916553d8d445eac5c323ec5b0f8",
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"status": "affected",
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"versionType": "git"
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{
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"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
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"lessThan": "9100191e5acb2e5ea2313f436667bb5fce129f47",
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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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"include/linux/ftrace.h",
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"kernel/trace/ftrace.c",
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"kernel/trace/trace.h",
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"kernel/trace/trace_functions.c",
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"kernel/trace/trace_stack.c"
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],
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"versions": [
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{
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"version": "3.15",
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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": "3.15",
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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": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.224",
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"lessThanOrEqual": "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": "6.1.191",
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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": "6.12.112",
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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": "7.2.5",
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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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"references": [
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},
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{
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"url": "https://git.kernel.org/stable/c/8f062a6bfeb4b4e18d469a673aec23a7b73c3e8a"
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},
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{
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"url": "https://git.kernel.org/stable/c/29266da8ee1d9be656b1f22460c49538e1930658"
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},
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{
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"url": "https://git.kernel.org/stable/c/177cd8966325f0ffffa3c9381f9e0422019a3973"
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},
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{
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"url": "https://git.kernel.org/stable/c/83fd7eca5ab0d3ac3f23bff889175d847e21af06"
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},
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{
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"url": "https://git.kernel.org/stable/c/cee8f286794df916553d8d445eac5c323ec5b0f8"
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},
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{
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"url": "https://git.kernel.org/stable/c/9100191e5acb2e5ea2313f436667bb5fce129f47"
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}
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],
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"title": "ftrace: Take trace_array reference before accessing its ftrace_ops",
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"x_generator": {
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}
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} |