305 lines
15 KiB
JSON
305 lines
15 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-2024-40990",
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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": "2024-07-12T12:17:45.605Z",
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"datePublished": "2024-07-12T12:37:34.485Z",
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"dateUpdated": "2026-08-05T11:34:28.146Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:34:28.146Z"
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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\nRDMA/mlx5: Add check for srq max_sge attribute\n\nmax_sge attribute is passed by the user, and is inserted and used\nunchecked, so verify that the value doesn't exceed maximum allowed value\nbefore using it."
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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 code is reached only through the local uverbs character device `/dev/infiniband/uverbsN` via the CREATE_SRQ/CREATE_XSRQ ioctl-style command; there is no path from a remote RDMA peer or network packet into `mlx5_ib_create_srq()` with an attacker-chosen `max_sge`.\nAC:L - The attacker fully controls `max_sge` (a raw `__u32` copied from the uverbs command with no core-layer validation) and `max_wr`, so the oversized `desc_size`/`wqe_shift`, the truncated firmware `log_rq_stride` field, and the undersized PAS computation are produced deterministically on the first attempt with no race or layout dependency.\nPR:L - `uverbs_devnode()` makes `/dev/infiniband/uverbs*` mode 0666 in the kernel itself, and allocating a PD plus creating an SRQ requires no capability (only a non-zero default `RLIMIT_MEMLOCK` for `ib_umem_get()`), so any unprivileged local user — including one inside a container with the RDMA device exposed — can trigger it.\nUI:N - The attacker performs the entire sequence (open uverbs device, alloc PD, create SRQ) itself; no action by any other user or administrator is needed.\nS:U - The corruption and its consequences are confined to the kernel's own security authority on the same host; no VM, IOMMU, or sandbox boundary is crossed by the flaw itself.\nC:H - The unchecked value undersizes the `kvzalloc()`'d CREATE_SRQ mailbox and its PAS array while `mlx5_ib_populate_pas()` is bounded only by the umem block count, and it desynchronizes the firmware's WQ geometry from the kernel's — memory corruption of this kind is leverageable for kernel heap disclosure, and on branches lacking the `WARN_ON` guard the device is handed a truncated physical-address list to DMA against.\nI:H - The same undersized-PAS / out-of-bounds descriptor-write condition yields a kernel heap write primitive, and the truncated `log_rq_stride`/`log_wq_stride` firmware fields let the NIC operate on a work queue whose stride and extent disagree with the memory actually registered for it, giving attacker-influenced writes.\nA:H - The path reliably produces a user-triggerable `WARN_ON()` in `__set_srq_page_size()` and a shift-out-of-bounds in `get_pas_size()` (kernel panic under `panic_on_warn` or UBSAN trap), and feeding the ConnectX firmware an inconsistent WQ geometry can drive the device into a fatal/health-recovery state that takes down all traffic on the adapter."
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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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"drivers/infiniband/hw/mlx5/srq.c"
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],
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"versions": [
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"lessThan": "7186b81c1f15e39069b1af172c6a951728ed3511",
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"status": "affected",
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"versions": [
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{
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"version": "3.11",
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"status": "affected"
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"version": "0",
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"status": "unaffected",
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"version": "5.10.221",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"status": "unaffected",
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"version": "6.9.7",
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"status": "unaffected",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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