222 lines
12 KiB
JSON
222 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-2026-92488",
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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": "2026-09-16T12:21:13.870Z",
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"datePublished": "2026-09-17T16:10:02.962Z",
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"dateUpdated": "2026-10-30T12:35:39.917Z"
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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": "2026-10-30T12:35:39.917Z"
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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/erdma: complete object teardown when the destroy command fails\n\nerdma_destroy_qp(), erdma_destroy_cq(), erdma_dereg_mr(), and\nerdma_destroy_ah() returned early when erdma_post_cmd_wait() failed,\nleaking the queue buffers, MTTs, doorbells and the STAG, QPN, CQN and AHN\nidentifiers. A command timeout clears ERDMA_CMDQ_STATE_OK_BIT and\npermanently disables the command queue, so no retry can succeed; the RDMA\ncore keeps the object after a failed destructor and forced uverbs cleanup\nthen nulls the pointers, making the resources unreachable.\n\nWarn on failure but release every software-owned resource and return\nsuccess, since during terminal destruction the hardware command result is\nonly diagnostic."
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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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 from ib_uverbs_write(IB_USER_VERBS_CMD_DESTROY_QP/DESTROY_CQ/DEREG_MR/DESTROY_AH) or ib_uverbs_ioctl(UVERBS_METHOD_*_DESTROY) on /dev/infiniband/uverbs*, which call uobj_destroy -> ib_destroy_qp_user/ib_destroy_cq_user/ib_dereg_mr_user -> erdma_destroy_*; a remote RoCE/iWARP peer never supplies that destroy command.\nAC:H - erdma_destroy_qp/cq/ah and erdma_dereg_mr only skip teardown when erdma_post_cmd_wait() fails. That wait returns -ETIME after ERDMA_CMDQ_TIMEOUT_MS and then clears ERDMA_CMDQ_STATE_OK_BIT, or -EIO on a hardware syndrome; the SQE is built by the driver from the kernel-owned QPN/CQN/lkey/AHN, so the attacker cannot force that failure.\nPR:L - ib_uverbs_open() only checks rdma_dev_access_netns() and uverbs_devnode() sets mode 0666. erdma_alloc_ucontext() requires CAP_SYS_RAWIO only when ERDMA_DEV_CAP_FLAGS_EXTEND_DB is unset; on extend-doorbell hardware an unprivileged local user can GET_CONTEXT, CREATE_QP/CQ and then hit the failing destructors.\nUI:N - The attacker issues DESTROY_* on their own uverbs fd or closes it so ib_uverbs_close() runs uverbs_destroy_ufile_hw(); no other user must mount a filesystem, open a file, or otherwise cooperate.\nS:U - A leftover erdma_cq/erdma_qp in cq_xa/qp_xa and a UAF of the associated ib_ucq_object stay inside the host kernel; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - On command failure erdma_destroy_cq() returns before xa_erase(&dev->cq_xa). __uverbs_cleanup_ufile(RDMA_REMOVE_DRIVER_FAILURE) then nulls uobj->object without ib_destroy_cq_user and frees the ib_ucq_object, so erdma_ceq_completion_handler() -> ib_uverbs_comp_handler() reads the freed cq->uobject.\nI:H - The same ib_uverbs_comp_handler() then list_add_tail()s onto the freed ev_queue->event_list and ib_ucq_object.comp_list after DRIVER_FAILURE dropped the uobject, a use-after-free write into slab memory that can corrupt a reused object or freelist metadata.\nA:H - The CEQ tasklet UAF in ib_uverbs_comp_handler() can oops; independently, returning before erdma_free_idx()/put_mtt_entries()/dma_free_coherent() leaks STAG/QPN/CQN/AHN IDs and DMA queue buffers, and a cmdq timeout permanently disables further commands."
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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/erdma/erdma_verbs.c"
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],
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"versions": [
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{
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"version": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "4f5cd6a2081ec956db25b8e9f71d052f68d522c7",
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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": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "3886d944b506e0cc681646beb03c3024cb375a68",
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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": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "5fcfc988ecf3e2bbe308b95c2c0d2f011d9afabe",
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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": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "ce7d205c264665517c25e8a3231cf2d0c2443e3c",
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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": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "334145d683ad3e31d052247f10807f2ebc950351",
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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": "155055771704f8cbb5c176a4309b7dc30a50450c",
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"lessThan": "652befcba956ef357f480525ccbe25c59bc81d4d",
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"status": "affected",
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"versionType": "git"
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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/hw/erdma/erdma_verbs.c"
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],
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"versions": [
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{
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"version": "6.0",
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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": "6.0",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.1.191"
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},
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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": "6.0",
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"versionEndExcluding": "6.6.160"
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.12.110"
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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/4f5cd6a2081ec956db25b8e9f71d052f68d522c7"
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},
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{
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"url": "https://git.kernel.org/stable/c/3886d944b506e0cc681646beb03c3024cb375a68"
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},
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{
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"url": "https://git.kernel.org/stable/c/5fcfc988ecf3e2bbe308b95c2c0d2f011d9afabe"
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},
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{
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"url": "https://git.kernel.org/stable/c/ce7d205c264665517c25e8a3231cf2d0c2443e3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/334145d683ad3e31d052247f10807f2ebc950351"
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},
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{
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"url": "https://git.kernel.org/stable/c/652befcba956ef357f480525ccbe25c59bc81d4d"
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}
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],
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"title": "RDMA/erdma: complete object teardown when the destroy command fails",
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"engine": "bippy-1.2.0"
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}
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} |