286 lines
16 KiB
JSON
286 lines
16 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-2026-98253",
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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": "2026-09-25T10:25:14.331Z",
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"datePublished": "2026-10-06T08:45:20.077Z",
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"dateUpdated": "2026-10-19T09:16:24.567Z"
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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": "2026-10-19T09:16:24.567Z"
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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/ucma: Serialize join and leave on copy_to_user failure\n\nrdma_join_multicast() queues RoCE work that later reads the ucma_multicast\nthrough event->param.ud.private_data, then list_add()s the CMA multicast\nat the head of id_priv->mc_list. rdma_leave_multicast() matches only by\nsockaddr and destroys the first hit.\n\nucma_process_join() used to drop ctx->mutex after a successful join and\nretake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls\nwith the same address can therefore insert a second CMA entry before the\nfirst thread's leave. leave then cancels the newer work and the older\nworker still dereferences the ucma_multicast that the first thread frees.\n\nKeep ctx->mutex held from rdma_join_multicast() through copy_to_user() and,\non -EFAULT, through rdma_leave_multicast() so leave cannot miss this join.\nDo not leave if join itself failed: that path never published this address\non mc_list, and a leave-by-addr would destroy an earlier successful join."
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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 by write() of RDMA_USER_CM_CMD_JOIN_MCAST/JOIN_IP_MCAST on the local char device /dev/infiniband/rdma_cm into ucma_process_join(). The trigger is local: two racing joins and a bad response pointer. No remote peer supplies the data that causes it, so AV:L.\nAC:L - The attacker drives every part of the race. They make copy_to_user() fail with a bad cmd->response pointer, and a second thread issues JOIN_MCAST for the same address while ctx->mutex is dropped. rdma_leave_multicast() then destroys the newer mc_list head and cancels the wrong iboe_join work. The attempt can be repeated until it wins.\nPR:L - rdma_cm is created with mode 0666 and ucma_write() does no capability check. Any local user on a host with a RoCE port can create a UD cm_id, bind it and join multicast. An unprivileged user cannot create a soft-RoCE device, because nldev NEWLINK needs CAP_NET_ADMIN in the initial namespace, so the RoCE port must already exist.\nUI:N - The attacker triggers the bug entirely through their own writes on an rdma_cm file descriptor they opened. No other user or administrator has to act.\nS:U - The freed ucma_multicast and the corrupted kernel heap are in the same kernel security authority. This is local kernel memory corruption, not a VM or IOMMU boundary crossing.\nC:H - cma_iboe_join_work_handler() calls ucma_create_uevent() on the freed ucma_multicast, reading mc->uid and mc->id into the event that GET_EVENT copies to userspace. If the freed slot is reclaimed with sprayed objects, this use-after-free gives a read primitive.\nI:H - uevent->mc keeps a pointer to the freed ucma_multicast, and ucma_get_event() then runs uevent->mc->events_reported++. That is an attacker-timed write into freed and reclaimable slab memory, usable to corrupt an object sprayed into the slot.\nA:H - The use-after-free of ucma_multicast in the RoCE join worker and in ucma_get_event() can corrupt the slab or oops the kernel, crashing the host. Syzbot reported this bug (extid a6ffe86390c8a6afc818)."
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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/ucma.c"
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],
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"versions": [
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{
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"version": "60d613b39e8d0c9f3b526e9c96445422b4562d76",
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"lessThan": "29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "52172e11bd074ccaded21740ffeb67123f01dd00",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "01e29d0d78a8f66f221625720a04939eef5ec1f6",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "ae805d204cf1f15b87d1bf3529b4c649f3519420",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "43c4e24bd10370fc976f6220518049ce71419399",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "01cbdb724c584d7772fd25af2e4dfdf8527ce0d5",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "83610ee5e498fa5bfcb80031d2b959baea276bf6",
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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": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
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"lessThan": "662ade4de9ff5eceb0820a9f8e9fac70ba6a815b",
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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": "a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4",
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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": "5.10.20",
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"lessThan": "5.10.271",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.11.3",
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"lessThan": "5.12",
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"status": "affected",
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"versionType": "semver"
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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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"drivers/infiniband/core/ucma.c"
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],
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"versions": [
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{
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"version": "5.12",
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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": "5.12",
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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": "5.10.271",
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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": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.112",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.54",
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"lessThanOrEqual": "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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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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"versionStartIncluding": "5.10.20",
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"versionEndExcluding": "5.10.271"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "5.15.222"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.1.189"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.12",
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"versionEndExcluding": "6.6.158"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.12",
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"versionEndExcluding": "6.12.112"
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"versionStartIncluding": "5.12",
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"versionEndExcluding": "7.2.8"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.12",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9"
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},
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{
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"url": "https://git.kernel.org/stable/c/52172e11bd074ccaded21740ffeb67123f01dd00"
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},
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{
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"url": "https://git.kernel.org/stable/c/01e29d0d78a8f66f221625720a04939eef5ec1f6"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae805d204cf1f15b87d1bf3529b4c649f3519420"
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},
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{
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"url": "https://git.kernel.org/stable/c/43c4e24bd10370fc976f6220518049ce71419399"
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},
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{
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"url": "https://git.kernel.org/stable/c/01cbdb724c584d7772fd25af2e4dfdf8527ce0d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/83610ee5e498fa5bfcb80031d2b959baea276bf6"
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},
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{
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"url": "https://git.kernel.org/stable/c/662ade4de9ff5eceb0820a9f8e9fac70ba6a815b"
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}
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],
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"title": "RDMA/ucma: Serialize join and leave on copy_to_user failure",
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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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} |