264 lines
15 KiB
JSON
264 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-2026-98367",
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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": "2026-09-25T10:25:14.344Z",
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"datePublished": "2026-10-06T08:46:52.452Z",
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"dateUpdated": "2026-10-19T09:18:19.262Z"
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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": "2026-10-19T09:18:19.262Z"
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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/siw: Clear association under lock if siw_qp_modify fails in siw_accept\n\nWe need to clear cep before release state_lock as siw_qp_llp_close and\nsiw_qp_modify->siw_qp_llp_close did.\n\nOtherwise if siw_qp_modify() fails in siw_accept(), the QP's state_lock\nis released before the error path cleanup. A concurrent ibv_modify_qp()\ntransitioning the QP to ERROR can race in this window:\n\n siw_accept() ibv_modify_qp(ERROR)\n ---------------------- ----------------------\n siw_qp_modify() fails\n up_write(&qp->state_lock)\n down_write(&qp->state_lock)\n nextstate_from_idle():\n\t\t\t\t if (qp->cep)\n siw_cep_put(qp->cep) <- frees cep\n qp->cep = NULL\n goto error\n cep->qp = NULL <- UAF\n\nClear qp->cep and drop the association reference taken by siw_cep_get(),\nall under the write lock held from the initial down_write(&qp->state_lock).\nThread B therefore sees qp->cep == NULL, skips its own put, and cannot free\nthe cep before siw_accept() is done with 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 - siw_accept() is called through the ops.iw_accept hook from iw_cm_accept(), which a local process reaches with the RDMA_USER_CM_CMD_ACCEPT command on /dev/infiniband/rdma_cm. The racing side is the uverbs MODIFY_QP command (ibv_modify_qp to ERROR), also local. No wire message carries data that causes the siw_qp_modify() failure, so the attack is local.\nAC:L - The attacker does control both racing threads, since it owns the QP and issues the accept and modify_qp calls itself. Even so, AC is High: in siw_accept the only way siw_qp_modify() can fail is siw_qp_readq_init() hitting a vcalloc() ENOMEM, and IRD/ORD are capped at 128, so the allocations are small. That failure depends on system-wide memory exhaustion, which the attacker cannot produce on demand.\nPR:L - Running rdma_accept and ibv_modify_qp on a QP the user created on an existing siw device needs only ordinary access to the rdma_cm and uverbs device nodes. Creating the siw link through RDMA_NLDEV_CMD_NEWLINK is admin-only, but no privilege is needed to use a device that already exists.\nUI:N - The attacker drives both siw_accept() and the concurrent ibv_modify_qp(ERROR) through their own rdma_cm and verbs calls, and the connecting peer can be the attacker over loopback. No other user has to do anything.\nS:U - The freed siw_cep and the writes into it both stay inside the kernel's own security authority. No VM, IOMMU or sandbox boundary is crossed.\nC:H - siw_qp_nextstate_from_idle() frees the siw_cep by calling siw_cep_put(qp->cep). The error path in siw_accept() then keeps using that freed object: it writes cep->qp = NULL, runs siw_free_cm_id, and calls siw_cep_set_free_and_put. A reclaimed object in that slot gives the attacker a use-after-free primitive that can be built into a kernel memory leak.\nI:H - After the free, the error path writes cep->qp = NULL and does kref and lock operations on the dead siw_cep. That corrupts whatever object has taken over the slot, and this kind of UAF write can be used to corrupt kernel data or hijack control flow.\nA:H - A kref_put or lock operation on the freed siw_cep in siw_cep_set_free_and_put can corrupt the slab or oops the kernel, and that crashes the host."
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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/sw/siw/siw_cm.c"
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],
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"versions": [
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{
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"version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "e3f039082856adab7e195dea1af45d93dd6a3f1c",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "ad50d19f3d1ce052b3a146143581e930a1efb33e",
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"status": "affected",
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},
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{
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"version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "030306bbb9273af80f14d7af20129661964cd9a7",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "df2584750314336edcbcc21fb388e04b260f35b7",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "9dcc0f4e488b70cff81e0e5717a498c929cf5de3",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "bfdc744bf20ae4c3ef2e470298de5237c5c9a13c",
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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": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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"lessThan": "32cd87f54dd1070020e664ccb0312a9f0fea79b4",
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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/sw/siw/siw_cm.c"
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],
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"versions": [
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{
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"version": "5.3",
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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": "5.3",
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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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{
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.3",
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"versionEndExcluding": "6.6.158"
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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/f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3f039082856adab7e195dea1af45d93dd6a3f1c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ad50d19f3d1ce052b3a146143581e930a1efb33e"
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},
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{
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"url": "https://git.kernel.org/stable/c/030306bbb9273af80f14d7af20129661964cd9a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/df2584750314336edcbcc21fb388e04b260f35b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/9dcc0f4e488b70cff81e0e5717a498c929cf5de3"
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},
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{
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"url": "https://git.kernel.org/stable/c/bfdc744bf20ae4c3ef2e470298de5237c5c9a13c"
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},
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{
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"url": "https://git.kernel.org/stable/c/32cd87f54dd1070020e664ccb0312a9f0fea79b4"
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}
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],
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"title": "RDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept",
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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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}
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} |