314 lines
16 KiB
JSON
314 lines
16 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-2025-37913",
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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": "2025-04-16T04:51:23.967Z",
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"datePublished": "2025-05-20T15:21:44.793Z",
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"dateUpdated": "2026-10-15T21:52:02.947Z"
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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": "2026-08-05T11:58:16.487Z"
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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\nnet_sched: qfq: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of qfq, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nThis patch checks whether the class was already added to the agg->active\nlist (cl_is_active) before doing the addition to cater for the reentrant\ncase.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"
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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 - Exploitation requires configuring a qfq qdisc, class, and netem child via tc/rtnetlink and then transmitting packets locally through that qdisc. Per kernel scoring guidance, tc/netlink qdisc bugs are Local.\nAC:L - The attacker fully controls every precondition — netem `duplicate 100%` makes the reentrancy deterministic, and `SO_PRIORITY` steers both the original and the cloned skb to the same qfq class, so the double list_add occurs on the first packet with no race to win.\nPR:L - The tc path is gated by `netlink_net_capable(skb, CAP_NET_ADMIN)`, which is satisfied by CAP_NET_ADMIN in the netns's owning user namespace; an unprivileged user obtains this with `unshare -Urn` (also auto-loading sch_qfq/sch_netem). This is Low, not High.\nUI:N - The attacker sets up the qdisc hierarchy and sends the packets entirely on their own; no victim action or interaction of any kind is needed.\nS:U - The corruption is confined to kernel heap structures owned by the network scheduler within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The corrupted `agg->active` list retains a dangling pointer to the kfree()'d `struct qfq_class`, and `qfq_peek_skb()` reads that freed object and dereferences `cl->qdisc->ops->peek`, giving an attacker who grooms the freed slab a kernel-memory read/disclosure primitive.\nI:H - The same use-after-free yields write primitives (`cl->deficit -= len` and `list_move_tail(&cl->alist, ...)` writing two pointers into reclaimed memory) plus an indirect call through a freed function-pointer table, which is exploitable for control-flow hijack and privilege escalation.\nA:H - The double list add corrupts a doubly linked list, tripping BUG/WARN under CONFIG_DEBUG_LIST and otherwise leading to use-after-free dereferences in qfq_dequeue that oops the kernel; the trigger is repeatable at will."
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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/sched/sch_qfq.c"
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],
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"versions": [
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{
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"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "041f410aec2c1751ee22b8b73ba05d38c3a6a602",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "005a479540478a820c52de098e5e767e63e36f0a",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "0bf32d6fb1fcbf841bb9945570e0e2a70072c00f",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "a43783119e01849fbf2fe8855634e8989b240cb4",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "53bc0b55178bd59bdd4bcd16349505cabf54b1a2",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "370218e8ce711684acc4cdd3cc3c6dd7956bc165",
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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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
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"lessThan": "f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4",
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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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"net/sched/sch_qfq.c"
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],
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"versions": [
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{
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"version": "5.0",
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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": "5.0",
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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": "5.4.294",
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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": "5.10.238",
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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": "5.15.182",
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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": "6.1.138",
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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": "6.6.90",
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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": "6.12.28",
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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": "6.14.6",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.0",
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},
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{
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"url": "https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a"
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},
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{
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"url": "https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb"
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},
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{
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"url": "https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4"
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},
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{
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"url": "https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165"
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},
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{
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"url": "https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4"
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}
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],
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"title": "net_sched: qfq: Fix double list add in class with netem as child qdisc",
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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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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:57:15.106Z"
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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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"id": "CVE-2025-37913",
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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": "2026-10-15T21:45:52.578125Z"
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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": "2026-10-15T21:52:02.947Z"
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}
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}
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]
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}
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} |