193 lines
9.6 KiB
JSON
193 lines
9.6 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-2026-97938",
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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": "2026-09-25T10:18:58.204Z",
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"datePublished": "2026-09-25T10:22:51.720Z",
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"dateUpdated": "2026-10-21T12:53:45.385Z"
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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": "2026-10-21T12:53:45.385Z"
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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\nreboot: fix cad_pid use-after-free race\n\ncad_pid is a single kernel-wide struct pid pointer. proc_do_cad_pid()\nreads it and passes it to pid_vnr() without protecting the lifetime of\nthe referenced struct pid. A concurrent writer can replace cad_pid and\ndrop the final reference to the old struct pid after the reader has\nloaded the pointer but before pid_vnr() has finished dereferencing it,\ncausing a use-after-free.\n\nkill_cad_pid() has the same lifetime race when it passes cad_pid to\nkill_pid().\n\nAt the time this issue was reported, an unprivileged user could reach the\nsysctl through user and PID namespaces because cad_pid was registered in\npid_table[]. Moving cad_pid back to the global reboot sysctl table\ncorrected that namespace and permission mismatch, but did not fix the\nunderlying lifetime race.\n\nFix this by treating cad_pid as an RCU-protected pointer at both read\nsites and by waiting for a grace period before dropping the old reference\non the write side.\n\ncall_rcu(&old_pid->rcu, ...) cannot be used here because free_pid()\nalso queues pid->rcu; queueing the same rcu_head twice can corrupt the\nRCU callback list.\n\nOriginal KASAN crash stack:\n kernel/pid.c:545 pid_nr_ns() # reads freed pid->level\n kernel/pid.c:556 pid_vnr() # calls pid_nr_ns()\n kernel/pid.c:775 proc_do_cad_pid() # calls pid_vnr(cad_pid)"
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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/sched.h",
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"include/linux/sched/signal.h",
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"init/main.c",
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"kernel/reboot.c",
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"kernel/signal.c"
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],
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"versions": [
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "0c1a966bc047af2801a70b8eb13f9df5d7ab925f",
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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": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "ae3e53fe3c1241855e3a88f74877738349948c78",
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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": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "ad72e2566643fff7f01666d845fb026898155e1f",
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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": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "9a17b0e053197a6a42cdc75e75a35b17aa662088",
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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": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "5a88f78df753993469dab4d1831f8fb4256a9468",
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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/sched.h",
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"include/linux/sched/signal.h",
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"init/main.c",
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"kernel/reboot.c",
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"kernel/signal.c"
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],
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"versions": [
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{
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"version": "2.6.19",
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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": "2.6.19",
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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": "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": "6.18.53",
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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": "7.2.7",
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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": "2.6.19",
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"versionEndExcluding": "6.6.160"
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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": "2.6.19",
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"versionEndExcluding": "6.12.112"
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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": "2.6.19",
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"versionEndExcluding": "6.18.53"
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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": "2.6.19",
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"versionEndExcluding": "7.2.7"
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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": "2.6.19",
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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/0c1a966bc047af2801a70b8eb13f9df5d7ab925f"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae3e53fe3c1241855e3a88f74877738349948c78"
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},
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{
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"url": "https://git.kernel.org/stable/c/ad72e2566643fff7f01666d845fb026898155e1f"
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},
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{
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"url": "https://git.kernel.org/stable/c/9a17b0e053197a6a42cdc75e75a35b17aa662088"
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},
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{
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"url": "https://git.kernel.org/stable/c/5a88f78df753993469dab4d1831f8fb4256a9468"
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}
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],
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"title": "reboot: fix cad_pid use-after-free race",
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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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} |