326 lines
18 KiB
JSON
326 lines
18 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-2025-40271",
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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": "2025-04-16T07:20:57.183Z",
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"datePublished": "2025-12-06T21:50:53.266Z",
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"dateUpdated": "2026-08-05T12:09:04.518Z"
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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": "2026-08-05T12:09:04.518Z"
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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\nfs/proc: fix uaf in proc_readdir_de()\n\nPde is erased from subdir rbtree through rb_erase(), but not set the node\nto EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE()\nset the erased node to EMPTY, then pde_subdir_next() will return NULL to\navoid uaf access.\n\nWe found an uaf issue while using stress-ng testing, need to run testcase\ngetdent and tun in the same time. The steps of the issue is as follows:\n\n1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current\n pde is tun3;\n\n2) in the [time windows] unregister netdevice tun3 and tun2, and erase\n them from rbtree. erase tun3 first, and then erase tun2. the\n pde(tun2) will be released to slab;\n\n3) continue to getdent process, then pde_subdir_next() will return\n pde(tun2) which is released, it will case uaf access.\n\nCPU 0 | CPU 1\n-------------------------------------------------------------------------\ntraverse dir /proc/pid/net/dev_snmp6/ | unregister_netdevice(tun->dev) //tun3 tun2\nsys_getdents64() |\n iterate_dir() |\n proc_readdir() |\n proc_readdir_de() | snmp6_unregister_dev()\n pde_get(de); | proc_remove()\n read_unlock(&proc_subdir_lock); | remove_proc_subtree()\n | write_lock(&proc_subdir_lock);\n [time window] | rb_erase(&root->subdir_node, &parent->subdir);\n | write_unlock(&proc_subdir_lock);\n read_lock(&proc_subdir_lock); |\n next = pde_subdir_next(de); |\n pde_put(de); |\n de = next; //UAF |\n\nrbtree of dev_snmp6\n |\n pde(tun3)\n / \\\n NULL pde(tun2)"
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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 triggered entirely through local syscalls — `getdents64(2)` on a procfs directory racing against `unshare(2)`/rtnetlink operations that remove `/proc` entries. No network or remote-peer data is involved.\nAC:L - The attacker owns both sides of the race: one thread iterates `/proc/self/net/dev_snmp6` while another spins netdevice rename/unregister to erase entries, and the `dir_emit()` window can be stretched arbitrarily by backing the `getdents64` buffer with userfaultfd or FUSE so the reader stalls in `copy_to_user` while the neighbour pde is freed and the slab groomed. The sequence is unbounded and retryable.\nPR:L - Reading `/proc/self/net/dev_snmp6` requires no privilege at all, and the removal side needs only `CAP_NET_ADMIN` inside an attacker-created user+network namespace (`unshare -Urn`), which any unprivileged user obtains on default distro configurations. No real root in the init namespace is needed.\nUI:N - The attacker drives both the directory iteration and the proc-entry removal from its own threads; no victim action or cooperation is required.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; there is no VM, IOMMU, or hypervisor boundary crossed.\nC:H - `dir_emit(ctx, de->name, de->namelen, ...)` reads the `char *name` pointer and `u8 namelen` out of the freed `proc_dir_entry` and copies up to 255 bytes from that pointer directly into the user's dirent buffer, giving a repeatable arbitrary-kernel-memory read into userspace once the slab object is reclaimed with attacker-influenced content.\nI:H - The use-after-free yields `refcount_inc()`/`refcount_dec_and_test()` on freed memory plus `pde_free()` performing `kfree(pde->data)`/`kfree(pde->name)` on pointers read from the reallocated object, providing arbitrary-free and heap-corruption primitives that are a standard basis for local privilege escalation.\nA:H - Dereferencing stale rbtree links into freed slab memory reliably produces a kernel oops/panic (as observed under stress-ng with getdents+tun), and the race can be re-run indefinitely to crash the system on demand."
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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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"fs/proc/generic.c"
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],
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"versions": [
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{
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"version": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "1d1596d68a6f11d28f677eedf6cf5b17dbfeb491",
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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": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "c81d0385500446efe48c305bbb83d47f2ae23a50",
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"status": "affected",
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},
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{
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"version": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "4cba73c4c89219beef7685a47374bf88b1022369",
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"status": "affected",
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{
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"version": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "6f2482745e510ae1dacc9b090194b9c5f918d774",
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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": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "67272c11f379d9aa5e0f6b16286b9d89b3f76046",
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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": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "623bb26127fb581a741e880e1e1a47d79aecb6f8",
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"status": "affected",
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},
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{
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"version": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "03de7ff197a3d0e17d0d5c58fdac99a63cba8110",
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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": "710585d4922fd315f2cada8fbe550ae8ed23e994",
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"lessThan": "895b4c0c79b092d732544011c3cecaf7322c36a1",
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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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"fs/proc/generic.c"
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],
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"versions": [
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{
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"version": "3.19",
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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": "3.19",
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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": "5.4.302",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.247",
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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": "5.15.197",
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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": "6.1.159",
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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": "6.6.117",
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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": "6.12.59",
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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": "6.17.9",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"url": "https://git.kernel.org/stable/c/1d1596d68a6f11d28f677eedf6cf5b17dbfeb491"
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},
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{
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"url": "https://git.kernel.org/stable/c/c81d0385500446efe48c305bbb83d47f2ae23a50"
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},
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{
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"url": "https://git.kernel.org/stable/c/4cba73c4c89219beef7685a47374bf88b1022369"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f2482745e510ae1dacc9b090194b9c5f918d774"
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},
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{
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"url": "https://git.kernel.org/stable/c/67272c11f379d9aa5e0f6b16286b9d89b3f76046"
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},
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{
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"url": "https://git.kernel.org/stable/c/623bb26127fb581a741e880e1e1a47d79aecb6f8"
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},
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{
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"url": "https://git.kernel.org/stable/c/03de7ff197a3d0e17d0d5c58fdac99a63cba8110"
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},
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{
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"url": "https://git.kernel.org/stable/c/895b4c0c79b092d732544011c3cecaf7322c36a1"
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}
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],
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"title": "fs/proc: fix uaf in proc_readdir_de()",
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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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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-06-02T13:00:17.378Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "RUGGEDCOM RST2428P",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "V4.0",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"
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}
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]
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},
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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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"timestamp": "2026-06-16T19:37:49.226666Z",
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"id": "CVE-2025-40271",
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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": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-06-16T19:37:59.970Z"
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}
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}
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]
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}
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} |