206 lines
11 KiB
JSON
206 lines
11 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-2024-35894",
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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": "2024-05-17T13:50:33.113Z",
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"datePublished": "2024-05-19T08:34:49.504Z",
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"dateUpdated": "2026-08-05T11:30:46.642Z"
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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": "2026-08-05T11:30:46.642Z"
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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\nmptcp: prevent BPF accessing lowat from a subflow socket.\n\nAlexei reported the following splat:\n\n WARNING: CPU: 32 PID: 3276 at net/mptcp/subflow.c:1430 subflow_data_ready+0x147/0x1c0\n Modules linked in: dummy bpf_testmod(O) [last unloaded: bpf_test_no_cfi(O)]\n CPU: 32 PID: 3276 Comm: test_progs Tainted: GO 6.8.0-12873-g2c43c33bfd23\n Call Trace:\n <TASK>\n mptcp_set_rcvlowat+0x79/0x1d0\n sk_setsockopt+0x6c0/0x1540\n __bpf_setsockopt+0x6f/0x90\n bpf_sock_ops_setsockopt+0x3c/0x90\n bpf_prog_509ce5db2c7f9981_bpf_test_sockopt_int+0xb4/0x11b\n bpf_prog_dce07e362d941d2b_bpf_test_socket_sockopt+0x12b/0x132\n bpf_prog_348c9b5faaf10092_skops_sockopt+0x954/0xe86\n __cgroup_bpf_run_filter_sock_ops+0xbc/0x250\n tcp_connect+0x879/0x1160\n tcp_v6_connect+0x50c/0x870\n mptcp_connect+0x129/0x280\n __inet_stream_connect+0xce/0x370\n inet_stream_connect+0x36/0x50\n bpf_trampoline_6442491565+0x49/0xef\n inet_stream_connect+0x5/0x50\n __sys_connect+0x63/0x90\n __x64_sys_connect+0x14/0x20\n\nThe root cause of the issue is that bpf allows accessing mptcp-level\nproto_ops from a tcp subflow scope.\n\nFix the issue detecting the problematic call and preventing any action."
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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 entered from a local syscall — `connect()`/`listen()` on an `IPPROTO_MPTCP` socket triggers the cgroup sock_ops hook on the grafted subflow before any packet is exchanged. No remote peer data is required to reach `mptcp_set_rcvlowat()` with the wrong sock type.\nAC:L - The type confusion is deterministic — no race and no memory-layout guessing is needed to reach it; creating an MPTCP socket and connecting reproduces it every time (as the BPF selftest did). Attack-relevant heap state (subflow send queue contents) is itself attacker-controlled.\nPR:L - On a realistic container/Kubernetes host that already has an administrator-installed cgroup sock_ops BPF program adjusting socket options, an ordinary unprivileged user needs no capability at all: `socket(AF_INET, SOCK_STREAM, IPPROTO_MPTCP)` requires no privilege and `connect()` drives the confusion.\nUI:N - The attacker triggers the bug entirely through their own syscalls on their own socket. No action by any other user or administrator is needed at exploitation time.\nS:U - The corruption stays within the kernel's own security authority — there is no VM, IOMMU, or sandbox boundary crossed. This is a standard in-kernel type confusion.\nC:H - Type confusion between `struct mptcp_sock` and `struct tcp_sock` causes pointers to be synthesized from unrelated socket memory and dereferenced, and the resulting `sk_rcvbuf`/`window_clamp` corruption at attacker-influenced addresses can be groomed into a read primitive. Per kernel scoring guidance, memory corruption leveragable for disclosure is High.\nI:H - `mptcp_for_each_subflow()` iterates a list head read out of type-confused memory and performs `WRITE_ONCE(ssk->sk_rcvbuf, space)` plus `tcp_sk(ssk)->window_clamp = val` through the resulting wild pointer, giving two 32-bit writes with attacker-influenced values at attacker-influenceable addresses — a control-flow-hijack-capable primitive.\nA:H - The confusion reliably produces a kernel oops: `do_div()` on the aliased `scaling_ratio` byte faults if it reads zero, and `lock_sock_fast()` on the bogus subflow pointer (typically a timestamp-derived non-canonical address) causes a general protection fault, plus the reported `WARN_ON_ONCE` panics under `panic_on_warn`."
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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/mptcp/sockopt.c"
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],
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"versions": [
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{
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"version": "124a4885b55f3039c697feb53edc5ad88bf21161",
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"lessThan": "ee3c845787b621cfe82c2e52c513024a9d7a78f5",
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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": "5684ab1a0effbfeb706f47d85785f653005b97b1",
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"lessThan": "3ffb1ab698376f09cc33101c07c1be229389fe29",
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"status": "affected",
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},
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"lessThan": "fcf4692fa39e86a590c14a4af2de704e1d20a3b5",
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"status": "affected",
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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/mptcp/sockopt.c"
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],
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"versions": [
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{
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"version": "6.7",
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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": "6.7",
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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": "6.8.5",
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"lessThanOrEqual": "6.8.*",
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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": "6.9",
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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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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.7",
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"versionEndExcluding": "6.8.5"
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},
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ee3c845787b621cfe82c2e52c513024a9d7a78f5"
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},
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"url": "https://git.kernel.org/stable/c/3ffb1ab698376f09cc33101c07c1be229389fe29"
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"url": "https://git.kernel.org/stable/c/fcf4692fa39e86a590c14a4af2de704e1d20a3b5"
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}
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],
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"title": "mptcp: prevent BPF accessing lowat from a subflow socket.",
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"engine": "bippy-1.2.0"
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}
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"adp": [
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"title": "CISA ADP Vulnrichment",
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"metrics": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-35894",
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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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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2024-05-23T17:19:11.932851Z"
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}
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"dateUpdated": "2024-06-04T17:34:48.035Z"
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}
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},
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"title": "CVE Program Container",
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