CVE-2026-98366

Что произошло

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: validate access flags before swapping the MR's PD rxe_rereg_user_mr() reassigns mr->ibmr.pd first and only then validates the IB_MR_REREG_ACCESS argument: if (flags & IB_MR_REREG_PD) { rxe_put(old_pd); rxe_get(pd); mr->ibmr.pd = ibpd; } if (flags & IB_MR_REREG_ACCESS) { if (access & ~RXE_ACCESS_SUPPORTED_MR) return ERR_PTR(-EOPNOTSUPP); mr->access = access; } Both flags pass the entry check because RXE_MR_REREG_SUPPORTED is IB_MR_REREG_PD | IB_MR_REREG_ACCESS, so a caller can reach the access check with mr->ibmr.pd already reassigned. mr->ibmr.pd is owned by the core, which adjusts pd->usecnt only on the success path: ib_uverbs_rereg_mr() jumps to put_new_uobj on a driver error without undoing the reassignment, so mr->pd == new_pd while the usecnts still charge the MR to orig_pd. ib_dereg_mr_user() then decrements new_pd, whose count can reach zero while a memory window still references it; uverbs_free_pd() frees the PD on that count alone and rxe_mw_cleanup() writes to freed memory: BUG: KASAN: slab-use-after-free in __rxe_put+0x31/0xa0 Write of size 4 at addr ffff8881301dd690 by task rxe_poc/591 __rxe_put+0x31/0xa0 rxe_mw_cleanup+0x42/0x200 __rxe_cleanup+0x115/0x370 rxe_dealloc_mw+0x4c/0x80 Allocated by task 591: ib_uverbs_alloc_pd+0x258/0x540 Freed by task 591: ib_dealloc_pd_user+0x174/0x210 uverbs_free_pd+0x8d/0xc0 ib_uverbs_dealloc_pd+0x18e/0x1d0 Validate the access flags before mutating any state so the callback either applies every requested change or none.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
  "lessThan": "08f12745cb72981aa2cabe214af0c7a42a856f0a",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
  "lessThan": "7230cc456d4bb2221c20c5f1d22b38b8576aa16f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
  "lessThan": "fe602c91a52e161ace4afd5bdb8f33270c554c6f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
  "lessThan": "4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "544c7f62cf32db2bd358f1e8a40a98bf98fa2a5c",
  "lessThan": "ae36a5b609ae79f4de966328b78d2584be9719a4",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "6.5"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "6.5",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.6.158",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.112",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.54",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.8",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:21.030191+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:17:16.410988+00:00"
  },
  "scores": [
    "cve"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:17:16.410988+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:17:16.410988+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:21.030191+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:17:16.410988+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены02.11.2026, 00:13
2. Данные обновлены29.10.2026, 12:47
3. Опубликована28.10.2026, 23:17

Личная заметка и статус

Другие CVE того же продукта