314 lines
16 KiB
JSON
314 lines
16 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2025-21971",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-12-29T08:45:45.797Z",
|
|
"datePublished": "2025-04-01T15:47:04.448Z",
|
|
"dateUpdated": "2026-10-15T21:51:56.131Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:55:46.501Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: Prevent creation of classes with TC_H_ROOT\n\nThe function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination\ncondition when traversing up the qdisc tree to update parent backlog\ncounters. However, if a class is created with classid TC_H_ROOT, the\ntraversal terminates prematurely at this class instead of reaching the\nactual root qdisc, causing parent statistics to be incorrectly maintained.\nIn case of DRR, this could lead to a crash as reported by Mingi Cho.\n\nPrevent the creation of any Qdisc class with classid TC_H_ROOT\n(0xFFFFFFFF) across all qdisc types, as suggested by Jamal."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 7.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The vulnerability is reached through RTM_NEWTCLASS rtnetlink messages (tc class add) plus locally generated traffic on a local netdev, requiring local system access. Per kernel scoring guidance, tc/netlink qdisc bugs are Local.\nAC:L - Exploitation is a deterministic fixed sequence — create a drr/hfsc/qfq/ets qdisc with handle ffff:, add a class with classid ffff:ffff, direct a packet to it, drop the filter, then delete the class — with no race window or attacker-uncontrollable precondition. Heap grooming to occupy the freed drr_class slab is fully under attacker control.\nPR:L - tc class creation requires only CAP_NET_ADMIN in the network namespace's owning user namespace (netlink_net_capable in rtnetlink_rcv_msg), which any unprivileged user obtains via unshare -Urn, where they can also create a dummy/veth device and generate the traffic needed. No real root in the init namespace is needed.\nUI:N - The attacker performs every step themselves — netlink configuration and packet transmission — with no action required from any other user or administrator.\nS:U - The corruption stays within the kernel's own security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The stale active-list entry produces a use-after-free on a kzalloc'd drr_class object; the attacker can reclaim that slab and have the kernel read pointers and data out of attacker-adjacent memory, and the resulting primitives can be leveraged for arbitrary kernel memory disclosure.\nI:H - The UAF yields both an unlink write (list_del on freed cl->alist) and an indirect call through cl->qdisc->ops->peek read from reclaimed heap memory, giving arbitrary write and control-flow hijack potential, i.e. full kernel integrity loss.\nA:H - Even without full exploitation, the dangling list entry causes a use-after-free oops in softirq context on the next dequeue, and the broken accounting permanently stalls the qdisc (drr_dequeue always returns NULL), halting transmission on the device — a repeatable kernel crash/DoS."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/sched/sch_api.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "7a82fe67a9f4d7123d8e5ba8f0f0806c28695006",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "003d92c91cdb5a64b25a9a74cb8543aac9a8bb48",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "78533c4a29ac3aeddce4b481770beaaa4f3bfb67",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "94edfdfb9505ab608e86599d1d1e38c83816fc1c",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "066a3b5b2346febf9a655b444567b7138e3bb939",
|
|
"lessThan": "0c3057a5a04d07120b3d0ec9c79568fceb9c921e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/sched/sch_api.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "2.6.25",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "2.6.25",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.4.292",
|
|
"lessThanOrEqual": "5.4.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.236",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.180",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.132",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.84",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.20",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.13.8",
|
|
"lessThanOrEqual": "6.13.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.14",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "5.4.292"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "5.10.236"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "5.15.180"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "6.1.132"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "6.6.84"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "6.12.20"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "6.13.8"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.25",
|
|
"versionEndExcluding": "6.14"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/7a82fe67a9f4d7123d8e5ba8f0f0806c28695006"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/003d92c91cdb5a64b25a9a74cb8543aac9a8bb48"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/78533c4a29ac3aeddce4b481770beaaa4f3bfb67"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/94edfdfb9505ab608e86599d1d1e38c83816fc1c"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0c3057a5a04d07120b3d0ec9c79568fceb9c921e"
|
|
}
|
|
],
|
|
"title": "net_sched: Prevent creation of classes with TC_H_ROOT",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
|
|
},
|
|
{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2025-11-03T19:40:14.063Z"
|
|
}
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2025-21971",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-15T21:43:55.303520Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-15T21:51:56.131Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |