303 lines
17 KiB
JSON
303 lines
17 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-2025-38154",
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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": "2025-04-16T04:51:23.990Z",
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"datePublished": "2025-07-03T08:35:57.188Z",
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"dateUpdated": "2026-10-15T21:52:09.725Z"
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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": "2026-08-05T11:59:54.410Z"
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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\nbpf, sockmap: Avoid using sk_socket after free when sending\n\nThe sk->sk_socket is not locked or referenced in backlog thread, and\nduring the call to skb_send_sock(), there is a race condition with\nthe release of sk_socket. All types of sockets(tcp/udp/unix/vsock)\nwill be affected.\n\nRace conditions:\n'''\nCPU0 CPU1\n\nbacklog::skb_send_sock\n sendmsg_unlocked\n sock_sendmsg\n sock_sendmsg_nosec\n close(fd):\n ...\n ops->release() -> sock_map_close()\n sk_socket->ops = NULL\n free(socket)\n sock->ops->sendmsg\n ^\n panic here\n'''\n\nThe ref of psock become 0 after sock_map_close() executed.\n'''\nvoid sock_map_close()\n{\n ...\n if (likely(psock)) {\n ...\n // !! here we remove psock and the ref of psock become 0\n sock_map_remove_links(sk, psock)\n psock = sk_psock_get(sk);\n if (unlikely(!psock))\n goto no_psock; <=== Control jumps here via goto\n ...\n cancel_delayed_work_sync(&psock->work); <=== not executed\n sk_psock_put(sk, psock);\n ...\n}\n'''\n\nBased on the fact that we already wait for the workqueue to finish in\nsock_map_close() if psock is held, we simply increase the psock\nreference count to avoid race conditions.\n\nWith this patch, if the backlog thread is running, sock_map_close() will\nwait for the backlog thread to complete and cancel all pending work.\n\nIf no backlog running, any pending work that hasn't started by then will\nfail when invoked by sk_psock_get(), as the psock reference count have\nbeen zeroed, and sk_psock_drop() will cancel all jobs via\ncancel_delayed_work_sync().\n\nIn summary, we require synchronization to coordinate the backlog thread\nand close() thread.\n\nThe panic I catched:\n'''\nWorkqueue: events sk_psock_backlog\nRIP: 0010:sock_sendmsg+0x21d/0x440\nRAX: 0000000000000000 RBX: ffffc9000521fad8 RCX: 0000000000000001\n...\nCall Trace:\n <TASK>\n ? die_addr+0x40/0xa0\n ? exc_general_protection+0x14c/0x230\n ? asm_exc_general_protection+0x26/0x30\n ? sock_sendmsg+0x21d/0x440\n ? sock_sendmsg+0x3e0/0x440\n ? __pfx_sock_sendmsg+0x10/0x10\n __skb_send_sock+0x543/0xb70\n sk_psock_backlog+0x247/0xb80\n...\n'''"
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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 race is closed by a local `close(fd)` on a sockmap-enrolled socket concurrent with the BPF backlog worker; while remote peer data drives the backlog side, the attacker must be local to control the socket lifetime. BPF/sockmap is Local per kernel scoring guidance.\nAC:L - The attacker controls both sides of the race — it generates the redirected traffic that schedules `sk_psock_backlog()` and picks the `close()` timing — and can repeat the attempt in a tight loop until it wins. No condition outside its influence is required.\nPR:L - An unprivileged local process suffices in the real deployments of this feature (Cilium/Istio sockops redirect, BPF-token-delegated containers), where a privileged agent enrols workload sockets into the sockmap and the attacker only needs to send/redirect data and close its own fd.\nUI:N - No victim action is needed; the attacker drives both the traffic and the close from its own process.\nS:U - The use-after-free and any resulting corruption remain within the kernel's own security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free on `struct socket` — the freed object can be resprayed from `sock_inode_cachep`, causing redirected payload to be transmitted through a stale/attacker-influenced socket and permitting kernel memory disclosure.\nI:H - `security_socket_sendmsg()` and `READ_ONCE(sock->ops)->sendmsg` dereference and indirect-call through a pointer loaded from freed memory, giving a control-flow hijack primitive once the freed `struct socket` is reclaimed with attacker-groomed contents.\nA:H - The maintainer reproduced a general-protection fault in `sock_sendmsg()` from the `sk_psock_backlog` workqueue; the NULLed `sock->ops` alone guarantees a fatal kernel oops in worker context."
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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/core/skmsg.c"
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],
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"versions": [
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{
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"version": "4959ffc65a0e94f8acaac20deac49f89e6ded52d",
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"lessThan": "4edb40b05cb6a261775abfd8046804ca139a5546",
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"status": "affected",
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"version": "5eabdf17fed2ad41b836bb4055ec36d95e512c50",
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"lessThan": "b19cbf0b9a91f5a0d93fbcd761ff71c48ab40ed9",
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"status": "affected",
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"version": "e946428439a0d2079959f5603256ac51b6047017",
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"lessThan": "4c6fa65ab2aec7df94809478c8d28ef38676a1b7",
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"lessThan": "15c0250dae3b48a398447d2b364603821ed4ed90",
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"status": "affected",
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"version": "4b4647add7d3c8530493f7247d11e257ee425bf0",
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"lessThan": "7c0a16f6ea2b1c82a03bccd5d1bdb4a7bbd4d987",
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"version": "3627605de498639a3c586c8684d12c89cba11073",
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"versionType": "git"
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},
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"version": "5.15.162",
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"lessThan": "5.15.186",
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"status": "affected",
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"versionType": "semver"
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"version": "6.1.95",
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"lessThan": "6.1.142",
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"status": "affected",
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},
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{
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"version": "6.6.35",
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"lessThan": "6.6.94",
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"status": "affected",
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},
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"version": "6.9.6",
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"lessThan": "6.10",
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"net/core/skmsg.c"
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],
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"version": "0",
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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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"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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"lessThanOrEqual": "*",
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"url": "https://git.kernel.org/stable/c/7c0a16f6ea2b1c82a03bccd5d1bdb4a7bbd4d987"
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}
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],
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"title": "bpf, sockmap: Avoid using sk_socket after free when sending",
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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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{
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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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"dateUpdated": "2025-11-03T17:34:44.423Z"
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}
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},
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{
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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-2025-38154",
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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": "2026-10-15T21:47:54.370471Z"
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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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"dateUpdated": "2026-10-15T21:52:09.725Z"
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]
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}
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} |