201 lines
12 KiB
JSON
201 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-2026-98366",
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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": "2026-10-06T08:46:51.638Z",
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"dateUpdated": "2026-10-19T09:18:18.297Z"
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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": "2026-10-19T09:18:18.297Z"
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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/rxe: validate access flags before swapping the MR's PD\n\nrxe_rereg_user_mr() reassigns mr->ibmr.pd first and only then\nvalidates the IB_MR_REREG_ACCESS argument:\n\n\tif (flags & IB_MR_REREG_PD) {\n\t\trxe_put(old_pd);\n\t\trxe_get(pd);\n\t\tmr->ibmr.pd = ibpd;\n\t}\n\n\tif (flags & IB_MR_REREG_ACCESS) {\n\t\tif (access & ~RXE_ACCESS_SUPPORTED_MR)\n\t\t\treturn ERR_PTR(-EOPNOTSUPP);\n\t\tmr->access = access;\n\t}\n\nBoth flags pass the entry check because RXE_MR_REREG_SUPPORTED is\nIB_MR_REREG_PD | IB_MR_REREG_ACCESS, so a caller can reach the access\ncheck with mr->ibmr.pd already reassigned.\n\nmr->ibmr.pd is owned by the core, which adjusts pd->usecnt only on the\nsuccess path: ib_uverbs_rereg_mr() jumps to put_new_uobj on a driver error\nwithout undoing the reassignment, so mr->pd == new_pd while the usecnts\nstill charge the MR to orig_pd. ib_dereg_mr_user() then decrements\nnew_pd, whose count can reach zero while a memory window still references\nit; uverbs_free_pd() frees the PD on that count alone and rxe_mw_cleanup()\nwrites to freed memory:\n\n BUG: KASAN: slab-use-after-free in __rxe_put+0x31/0xa0\n Write of size 4 at addr ffff8881301dd690 by task rxe_poc/591\n __rxe_put+0x31/0xa0\n rxe_mw_cleanup+0x42/0x200\n __rxe_cleanup+0x115/0x370\n rxe_dealloc_mw+0x4c/0x80\n Allocated by task 591:\n ib_uverbs_alloc_pd+0x258/0x540\n Freed by task 591:\n ib_dealloc_pd_user+0x174/0x210\n uverbs_free_pd+0x8d/0xc0\n ib_uverbs_dealloc_pd+0x18e/0x1d0\n\nValidate the access flags before mutating any state so the callback either\napplies every requested change or none."
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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 bad access_flags/pd_handle reach rxe_rereg_user_mr() only through a local IB_USER_VERBS_CMD_REREG_MR on /dev/infiniband/uverbsN via ib_uverbs_rereg_mr(); no RoCE packet carries rereg arguments, so a remote peer cannot drive it.\nAC:L - Deterministic: flags IB_MR_REREG_PD|IB_MR_REREG_ACCESS with access=IB_ACCESS_RELAXED_ORDERING passes core ib_check_mr_access() but fails RXE_ACCESS_SUPPORTED_MR after mr->ibmr.pd was swapped; the attacker then deregs the MR and deallocs the PD its own MW still uses. No race.\nPR:L - uverbs_devnode() creates /dev/infiniband/uverbsN mode 0666 and there is no capability check from ib_uverbs_rereg_mr() to rxe_rereg_user_mr(); any unprivileged local user owning a PD/MR/MW triggers it. Only the one-time admin rxe link creation (RDMA_NL_ADMIN_PERM) is needed.\nUI:N - The attacker's own process issues alloc_pd, reg_mr, alloc_mw, the failing rereg_mr, dereg_mr and dealloc_pd; no other user or administrator action is involved.\nS:U - The freed rxe PD and the corrupted refcounts are kernel heap objects within the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - After uverbs_free_pd() frees the PD on usecnt alone, the surviving MW still holds a dangling pointer to it; reclaiming that slab object with sprayed data turns later accesses through the MW into a use-after-free read of attacker-shaped memory.\nI:H - rxe_mw_cleanup() -> __rxe_put() writes (refcount decrement, KASAN write of size 4) into the freed PD, and the inconsistent mr->pd vs usecnt state can be repeated; a decrement into reallocated slab memory is a usable corruption primitive toward privilege escalation.\nA:H - The use-after-free write in __rxe_put() during rxe_dealloc_mw() corrupts freed slab memory and can oops or panic the kernel, and an unprivileged user can repeat it at will."
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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/rxe/rxe_verbs.c"
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],
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"versions": [
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{
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"version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
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"lessThan": "08f12745cb72981aa2cabe214af0c7a42a856f0a",
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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": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
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"lessThan": "7230cc456d4bb2221c20c5f1d22b38b8576aa16f",
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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": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
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"lessThan": "fe602c91a52e161ace4afd5bdb8f33270c554c6f",
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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": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
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"lessThan": "4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8",
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"status": "affected",
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},
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{
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"version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
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"lessThan": "ae36a5b609ae79f4de966328b78d2584be9719a4",
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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/rxe/rxe_verbs.c"
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],
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"versions": [
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{
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"version": "6.5",
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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": "6.5",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.5",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/08f12745cb72981aa2cabe214af0c7a42a856f0a"
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},
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{
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"url": "https://git.kernel.org/stable/c/7230cc456d4bb2221c20c5f1d22b38b8576aa16f"
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},
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{
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"url": "https://git.kernel.org/stable/c/fe602c91a52e161ace4afd5bdb8f33270c554c6f"
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},
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{
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"url": "https://git.kernel.org/stable/c/4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae36a5b609ae79f4de966328b78d2584be9719a4"
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}
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],
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"title": "RDMA/rxe: validate access flags before swapping the MR's PD",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |