542 lines
26 KiB
JSON
542 lines
26 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-2026-23274",
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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": "2026-01-13T15:37:45.991Z",
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"datePublished": "2026-03-20T08:08:54.918Z",
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"dateUpdated": "2026-11-10T12:42:15.013Z"
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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": "2026-08-05T12:21:04.973Z"
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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\nnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels\n\nIDLETIMER revision 0 rules reuse existing timers by label and always call\nmod_timer() on timer->timer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer->timer is never initialized.\nReusing that object from revision 0 causes mod_timer() on an uninitialized\ntimer_list, triggering debugobjects warnings and possible panic when\npanic_on_warn=1.\n\nFix this by rejecting revision 0 rule insertion when an existing timer with\nthe same label is of ALARM type."
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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 - This is accessed through the iptables/netfilter sockopt interface (IPT_SO_SET_REPLACE), which requires local system access to create iptables rules. This is a local attack vector via setsockopt syscall.\nAC:L - The attacker can reliably trigger this by first creating a rev1 IDLETIMER rule with XT_IDLETIMER_ALARM flag and a chosen label, then creating a rev0 rule with the same label. No race condition or special conditions needed — this is a deterministic two-step operation.\nPR:L - The iptables interface requires CAP_NET_ADMIN, but ip_tables.c uses ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN), meaning an unprivileged user can obtain this capability via user namespaces (unshare -Urn), making this reachable from a low-privilege user.\nUI:N - No user interaction is required. The attacker creates both iptables rules themselves without any victim action.\nS:U - The vulnerability stays within the kernel's security scope — there is no crossing of a security boundary like VM escape or sandbox escape. It's a standard kernel privilege escalation scenario.\nC:H - The bug calls mod_timer() on an uninitialized timer_list from kmalloc'd memory. Since kmalloc does not zero memory, the timer_list contains stale heap content which an attacker can influence via heap spraying, potentially achieving arbitrary read through controlled function pointers and timer wheel manipulation.\nI:H - Operating mod_timer() on a timer_list with attacker-influenced stale heap data (uninitialized function pointer, hlist_node entries) can corrupt timer wheel data structures and potentially achieve arbitrary code execution if the function pointer is controlled through heap spraying.\nA:H - At minimum, mod_timer() on uninitialized memory triggers debug_assert_init() WARN which causes panic with panic_on_warn=1. Even without that, following garbage pointers in timer_list->entry corrupts kernel data structures causing a crash/oops."
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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/netfilter/xt_IDLETIMER.c"
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],
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{
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"version": "68983a354a655c35d3fb204489d383a2a051fda7",
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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/netfilter/xt_IDLETIMER.c"
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],
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},
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"version": "0",
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"status": "unaffected",
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},
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"version": "5.10.253",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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"version": "5.15.203",
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"status": "unaffected",
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},
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"version": "6.1.167",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.130",
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},
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{
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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": "6.18.19",
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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": "6.19.9",
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"lessThanOrEqual": "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": "7.0",
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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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"url": "https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9"
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"url": "https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491"
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},
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"url": "https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9"
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},
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{
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"url": "https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1"
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"url": "https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309"
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"url": "https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf"
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}
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],
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"title": "netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-11-10T12:42:15.013Z"
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},
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
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{
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|
"vendor": "Siemens",
|
|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.7",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-23274",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:07:15.752483Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-758",
|
|
"description": "CWE-758 Reliance on Undefined, Unspecified, or Implementation-Defined Behavior"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:41.155Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |