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vuln-cve/data/2025/38xxx/CVE-2025-38617.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38617",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:24.029Z",
"datePublished": "2025-08-22T13:01:23.963Z",
"dateUpdated": "2026-10-15T22:02:26.912Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:03:32.785Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: fix a race in packet_set_ring() and packet_notifier()\n\nWhen packet_set_ring() releases po->bind_lock, another thread can\nrun packet_notifier() and process an NETDEV_UP event.\n\nThis race and the fix are both similar to that of commit 15fe076edea7\n(\"net/packet: fix a race in packet_bind() and packet_notifier()\").\n\nThere too the packet_notifier NETDEV_UP event managed to run while a\npo->bind_lock critical section had to be temporarily released. And\nthe fix was similarly to temporarily set po->num to zero to keep\nthe socket unhooked until the lock is retaken.\n\nThe po->bind_lock in packet_set_ring and packet_notifier precede the\nintroduction of git history."
}
],
"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 - Triggering the race requires local syscalls — creating an AF_PACKET socket, calling setsockopt(PACKET_RX_RING), and generating NETDEV_UP/NETDEV_DOWN events via netlink on a bound device. A remote peer can supply the packet data that lands in the freed ring, but cannot set up the race itself.\nAC:L - The attacker controls both sides of the race — one thread issues the PACKET_RX_RING setsockopt while another flaps the bound interface — and the unlocked window in packet_set_ring() spans a full synchronize_net() RCU grace period, making the race trivially winnable and repeatable.\nPR:L - packet_create() requires only ns_capable(net->user_ns, CAP_NET_RAW), which an unprivileged user obtains with `unshare -Urn`, along with CAP_NET_ADMIN in that namespace to create a veth/dummy device and bring it up and down. Containers with Docker's default capability set (which includes NET_RAW) also reach this directly.\nUI:N - The attacker performs every step — socket setup, ring teardown, interface flap, and packet injection — with no action from any other user.\nS:U - The corruption is confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - tpacket_rcv() operates on the freed pg_vec pages and stale prb_bdqc pointers, and the reclaimed pages remain user-mmapped via packet_mmap(), giving the attacker a read window onto whatever kernel data is reallocated into them — an arbitrary kernel memory disclosure primitive.\nI:H - skb_copy_bits() and prb_fill_curr_block() write attacker-chosen packet contents and block metadata into freed ring pages after free_pg_vec(), yielding a controlled use-after-free write that is heap-sprayable into privilege escalation.\nA:H - In the simplest outcome, packet_lookup_frame() dereferences a NULL rb->pg_vec and test_bit() a NULL rx_owner_map from softirq context, causing an immediate kernel oops/panic that any local user can trigger at will."
}
]
}
],
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{
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/packet/af_packet.c"
],
"versions": [
{
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"lessThan": "18f13f2a83eb81be349a9757ba2141ff1da9ad73",
"status": "affected",
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"status": "affected",
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{
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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{
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"lessThan": "01d3c8417b9c1b884a8a981a3b886da556512f36",
"status": "affected",
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}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/packet/af_packet.c"
],
"versions": [
{
"version": "2.6.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.12",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
"version": "5.15.190",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
"version": "6.1.148",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.6.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
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{
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"status": "unaffected",
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},
{
"version": "6.16.1",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"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:*:*:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/18f13f2a83eb81be349a9757ba2141ff1da9ad73"
},
{
"url": "https://git.kernel.org/stable/c/7da733f117533e9b2ebbd530a22ae4028713955c"
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{
"url": "https://git.kernel.org/stable/c/ba2257034755ae773722f15f4c3ad1dcdad15ca9"
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"url": "https://git.kernel.org/stable/c/88caf46db8239e6471413d28aabaa6b8bd552805"
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{
"url": "https://git.kernel.org/stable/c/f2e8fcfd2b1bc754920108b7f2cd75082c5a18df"
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{
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},
{
"url": "https://git.kernel.org/stable/c/01d3c8417b9c1b884a8a981a3b886da556512f36"
},
{
"url": "https://blog.calif.io/p/a-race-within-a-race-exploiting-cve"
},
{
"url": "https://github.com/google/security-research/pull/339"
}
],
"title": "net/packet: fix a race in packet_set_ring() and packet_notifier()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
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"shortName": "CVE",
"dateUpdated": "2025-11-03T17:40:28.543Z"
}
},
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2025-38617",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:52:21.634455Z"
}
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}
],
"title": "CISA ADP Vulnrichment",
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"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T22:02:26.912Z"
}
}
]
}
}
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