223 lines
12 KiB
JSON
223 lines
12 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-2021-47391",
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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": "2024-05-21T14:58:30.813Z",
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"datePublished": "2024-05-21T15:03:49.545Z",
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"dateUpdated": "2026-08-05T08:47:36.737Z"
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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": "2026-08-05T08:47:36.737Z"
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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/cma: Ensure rdma_addr_cancel() happens before issuing more requests\n\nThe FSM can run in a circle allowing rdma_resolve_ip() to be called twice\non the same id_priv. While this cannot happen without going through the\nwork, it violates the invariant that the same address resolution\nbackground request cannot be active twice.\n\n CPU 1 CPU 2\n\nrdma_resolve_addr():\n RDMA_CM_IDLE -> RDMA_CM_ADDR_QUERY\n rdma_resolve_ip(addr_handler) #1\n\n\t\t\t process_one_req(): for #1\n addr_handler():\n RDMA_CM_ADDR_QUERY -> RDMA_CM_ADDR_BOUND\n mutex_unlock(&id_priv->handler_mutex);\n [.. handler still running ..]\n\nrdma_resolve_addr():\n RDMA_CM_ADDR_BOUND -> RDMA_CM_ADDR_QUERY\n rdma_resolve_ip(addr_handler)\n !! two requests are now on the req_list\n\nrdma_destroy_id():\n destroy_id_handler_unlock():\n _destroy_id():\n cma_cancel_operation():\n rdma_addr_cancel()\n\n // process_one_req() self removes it\n\t\t spin_lock_bh(&lock);\n cancel_delayed_work(&req->work);\n\t if (!list_empty(&req->list)) == true\n\n ! rdma_addr_cancel() returns after process_on_req #1 is done\n\n kfree(id_priv)\n\n\t\t\t process_one_req(): for #2\n addr_handler():\n\t mutex_lock(&id_priv->handler_mutex);\n !! Use after free on id_priv\n\nrdma_addr_cancel() expects there to be one req on the list and only\ncancels the first one. The self-removal behavior of the work only happens\nafter the handler has returned. This yields a situations where the\nreq_list can have two reqs for the same \"handle\" but rdma_addr_cancel()\nonly cancels the first one.\n\nThe second req remains active beyond rdma_destroy_id() and will\nuse-after-free id_priv once it inevitably triggers.\n\nFix this by remembering if the id_priv has called rdma_resolve_ip() and\nalways cancel before calling it again. This ensures the req_list never\ngets more than one item in it and doesn't cost anything in the normal flow\nthat never uses this strange error path."
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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 bug is reached through the RDMA userspace CM misc device (/dev/infiniband/rdma_cm) via ucma_resolve_ip/ucma_resolve_addr and destroy ioctls; it is a local syscall path, not triggered by remote packets alone.\nAC:L - The attacker fully controls both sides of the race by issuing concurrent RESOLVE_IP and DESTROY_ID commands on the same CM id, so success does not depend on victim state outside attacker influence.\nPR:L - The rdma_cm misc device is registered with mode 0666 and create/resolve/destroy paths perform no capability checks, so any unprivileged local user can open it and trigger the bug.\nUI:N - Exploitation requires only the attacker's own ucma operations; no action by another user is needed.\nS:U - This is a standard in-kernel use-after-free leading to privilege escalation within the same OS security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - The dangling addr_handler runs against a freed rdma_id_private, giving a classic kernel UAF that can be leveraged for arbitrary memory disclosure.\nI:H - UAF of id_priv enables heap reuse and corruption suitable for arbitrary write or control-flow hijacking in the kernel.\nA:H - The second queued request inevitably invokes addr_handler on freed memory, causing kernel oops/panic even when not fully exploited."
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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/core/cma.c",
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"drivers/infiniband/core/cma_priv.h"
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],
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"status": "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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"drivers/infiniband/core/cma.c",
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"drivers/infiniband/core/cma_priv.h"
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],
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"versions": [
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{
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"version": "2.6.18",
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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": "2.6.18",
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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": "5.10.188",
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"lessThanOrEqual": "5.10.*",
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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": "5.14.10",
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"lessThanOrEqual": "5.14.*",
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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": "5.15",
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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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}
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"title": "RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests",
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