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-2025-40201",
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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": "2025-04-16T07:20:57.178Z",
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"datePublished": "2025-11-12T21:56:34.063Z",
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"dateUpdated": "2026-10-15T22:02:40.564Z"
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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": "2026-08-05T12:08:29.919Z"
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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\nkernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths\n\nThe usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit()\npath is very broken.\n\nsys_prlimit64() does get_task_struct(tsk) but this only protects task_struct\nitself. If tsk != current and tsk is not a leader, this process can exit/exec\nand task_lock(tsk->group_leader) may use the already freed task_struct.\n\nAnother problem is that sys_prlimit64() can race with mt-exec which changes\n->group_leader. In this case do_prlimit() may take the wrong lock, or (worse)\n->group_leader may change between task_lock() and task_unlock().\n\nChange sys_prlimit64() to take tasklist_lock when necessary. This is not\nnice, but I don't see a better fix for -stable."
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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 vulnerability is reached through the `prlimit64()` syscall (and pid-targeted setrlimit paths) from a local process; no network or physical vector is involved.\nAC:L - The attacker drives both sides of the race using their own processes — one loop calling prlimit64() on a non-leader TID while a co-operating multithreaded process repeatedly performs mt-exec or group-exit-and-reap — and can retry indefinitely until the window is hit.\nPR:L - check_prlimit_permission() grants access on a plain uid/gid match, so any unprivileged local user can target a non-leader thread of a process they own; no CAP_SYS_RESOURCE or root is required, and it works unrestricted inside containers.\nUI:N - The attacker creates the victim threads, the exec/exit, and the racing syscall entirely on their own; no action by any other user is needed.\nS:U - The corruption and its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on a task_struct: update_rlimit_cpu() dereferences the freed leader's ->sighand/->signal, and an attacker who reallocates the slot via fork() spraying can leverage the dangling-pointer reads for kernel memory disclosure.\nI:H - The UAF gives write primitives — spin_lock/spin_unlock words written into freed memory plus an attacker-supplied RLIMIT_CPU value written through a dangling sighand/signal pointer — sufficient to corrupt a reallocated live task_struct and pursue control-flow hijack.\nA:H - The mismatched task_lock()/task_unlock() across a de_thread() leaves a task's alloc_lock permanently held, deadlocking every subsequent task_lock() user (/proc readers, exec, fs_struct access), and the UAF itself readily oopses/panics the kernel."
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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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"kernel/sys.c"
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],
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"versions": [
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{
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"version": "18c91bb2d87268d23868bf13508f5bc9cf04e89a",
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"lessThan": "1bc0d9315ef5296abb2c9fd840336255850ded18",
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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": "18c91bb2d87268d23868bf13508f5bc9cf04e89a",
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"lessThan": "132f827e7bac7373e1522e89709d70b43cae5342",
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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": "18c91bb2d87268d23868bf13508f5bc9cf04e89a",
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"lessThan": "19b45c84bd9fd42fa97ff80c6350d604cb871c75",
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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": "18c91bb2d87268d23868bf13508f5bc9cf04e89a",
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"lessThan": "6796412decd2d8de8ec708213bbc958fab72f143",
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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": "18c91bb2d87268d23868bf13508f5bc9cf04e89a",
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"lessThan": "a15f37a40145c986cdf289a4b88390f35efdecc4",
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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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"kernel/sys.c"
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],
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"versions": [
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{
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"version": "5.18",
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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": "5.18",
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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": "6.1.157",
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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": "6.6.113",
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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": "6.12.54",
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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": "6.17.4",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "5.18",
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"versionEndExcluding": "6.1.157"
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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": "5.18",
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"versionEndExcluding": "6.6.113"
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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": "5.18",
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"versionEndExcluding": "6.12.54"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "6.17.4"
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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": "5.18",
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"versionEndExcluding": "6.18"
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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/1bc0d9315ef5296abb2c9fd840336255850ded18"
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},
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{
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"url": "https://git.kernel.org/stable/c/132f827e7bac7373e1522e89709d70b43cae5342"
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},
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{
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"url": "https://git.kernel.org/stable/c/19b45c84bd9fd42fa97ff80c6350d604cb871c75"
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},
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{
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"url": "https://git.kernel.org/stable/c/6796412decd2d8de8ec708213bbc958fab72f143"
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},
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{
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"url": "https://git.kernel.org/stable/c/a15f37a40145c986cdf289a4b88390f35efdecc4"
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}
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],
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"title": "kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-40201",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:58:02.275858Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:40.564Z"
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}
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}
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]
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}
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} |