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-2025-38108",
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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": "2025-04-16T04:51:23.985Z",
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"datePublished": "2025-07-03T08:35:18.523Z",
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"dateUpdated": "2026-10-15T21:52:08.492Z"
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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": "2026-08-05T11:59:36.285Z"
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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: red: fix a race in __red_change()\n\nGerrard Tai reported a race condition in RED, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n | [5]: lock root\n | [6]: rehash\n | [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent's qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."
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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 path is reached only through `RTM_NEWQDISC` rtnetlink messages on a local netlink socket (`tc qdisc change ... red`), plus locally-generated traffic to fill the SFQ child. No remote peer can reach `__red_change()`.\nAC:L - The attacker controls both sides of the race — they configure the SFQ perturb period (1s), arm the timer, fill the queue so `sfq_rehash()` drops packets, and drive the `__red_change()` loop, retrying unboundedly across many RED/SFQ hierarchies with no external precondition.\nPR:L - Only CAP_NET_ADMIN within the netns owner's user namespace is required (net/core/rtnetlink.c:6922 uses `netlink_net_capable()`), which any unprivileged local user obtains via `unshare -Urn`; qdisc module autoload is not additionally gated.\nUI:N - The attacker performs every step — creating the qdisc hierarchy, generating the traffic, and issuing the change requests. No victim action is involved.\nS:U - The corrupted state and any resulting memory corruption are confined to the kernel of the same host; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - The `qlen`/`backlog` underflow desynchronizes parent qdisc accounting from its class active lists, yielding stale/freed class objects being walked in the dequeue path — a use-after-free-grade primitive that gives an attacker control over freed slab contents and thus kernel memory disclosure.\nI:H - The same qlen-underflow-to-UAF desync in classful parents (HTB/HFSC/DRR/QFQ/ETS) permits heap grooming over the freed class objects and corruption of adjacent kernel structures and function pointers, giving a write/control-flow primitive; the fix's own wording notes the underflow \"can be abused.\"\nA:H - A parent qdisc believing it holds ~4 billion packets triggers `WARN_ON`s, NULL dereferences in the dequeue path, and permanently wedged/inconsistent qdisc state, and any resulting use-after-free reliably panics the kernel."
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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_red.c"
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],
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"net/sched/sch_red.c"
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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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"version": "5.4.295",
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"lessThanOrEqual": "5.4.*",
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},
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{
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"version": "5.10.239",
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},
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{
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"version": "5.15.186",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.142",
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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": "6.6.94",
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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": "6.12.34",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.15.3",
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"lessThanOrEqual": "6.15.*",
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"status": "unaffected",
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{
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"version": "6.16",
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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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"title": "net_sched: red: fix a race in __red_change()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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/msg00008.html"
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-38108",
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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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"Technical Impact": "total"
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:47:28.023257Z"
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-10-15T21:52:08.492Z"
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