271 lines
14 KiB
JSON
271 lines
14 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-2026-23413",
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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": "2026-01-13T15:37:46.014Z",
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"datePublished": "2026-04-02T11:40:54.384Z",
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"dateUpdated": "2026-10-19T18:35:42.855Z"
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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": "2026-08-05T12:21:33.571Z"
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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\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other."
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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 vulnerable `clsact` qdisc init/destroy path is reached through local rtnetlink `RTM_NEWQDISC` traffic, not by remote packets directly.\nAC:L - The failure path is attacker-controlled by creating/replacing `clsact` with shared block indexes so `tcf_block_get_ext()` fails during rollback; no uncontrollable race is required.\nPR:L - `RTM_NEWQDISC` requires `CAP_NET_ADMIN` in the target network namespace, and `tc`/qdisc operations are reachable by an unprivileged user via user+network namespaces.\nUI:N - After local access, exploitation only requires issuing crafted netlink/qdisc operations and does not require victim interaction.\nS:U - The bug is a standard kernel memory corruption issue within the same kernel security authority, not a VM or hardware isolation boundary escape.\nC:H - The bug is a use-after-free of `tcx_entry` state reachable through old `clsact` miniq callbacks, and UAF memory reuse can provide kernel memory disclosure primitives.\nI:H - The stale miniq pointer can lead to writes through freed/reallocated kernel memory, making control-flow or kernel data corruption defensible.\nA:H - The same UAF can be triggered into kernel crashes/oopses during qdisc/filter cleanup or callback paths, causing high availability impact."
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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/net/sch_generic.h",
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"net/sched/sch_ingress.c"
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],
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"versions": [
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{
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"version": "230bb13650b0f186f540500fd5f5f7096a822a2a",
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"lessThan": "a73d95b57bf9faebdfed591bcb7ed9292062a84c",
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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": "1cb6f0bae50441f4b4b32a28315853b279c7404e",
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"status": "affected",
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"status": "affected",
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"versionType": "git"
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},
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"version": "f61ecf1bd5b562ebfd7d430ccb31619857e80857",
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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": "6.6.41",
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"lessThan": "6.6.130",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.9.10",
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"lessThan": "6.10",
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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/net/sch_generic.h",
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"net/sched/sch_ingress.c"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.6.130",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.78",
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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": "6.18.20",
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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": "6.19.10",
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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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"cpeApplicability": [
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}
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],
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"title": "clsact: Fix use-after-free in init/destroy rollback asymmetry",
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-23413",
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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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"version": "2.0.3",
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"timestamp": "2026-10-16T15:07:46.676905Z"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T18:35:42.855Z"
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} |