CVE-2026-98365RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
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EPSS puts the chance of exploitation in the next 30 days at 0.38%, higher than 31% of scored CVEs.
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In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access mr_check_range() validates that [iova, iova+length) falls within the registered MR range using wraparound-prone arithmetic: if (iova < mr->ibmr.iova || iova + length > mr->ibmr.iova + mr->ibmr.length) A remote peer can craft an RDMA-Write/Read RETH so that iova + length wraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the check. rxe_mr_iova_to_index() then computes a huge index (int idx, only guarded by WARN_ON) and rxe_mr_copy_xarray() dereferences mr->page_info[huge], causing an out-of-bounds read/write and a kernel oops that is triggerable by an unauthenticated remote peer. Rewrite the check in overflow-safe form; the first two clauses guarantee that the subsequent subtractions do not underflow: if (iova < mr->ibmr.iova || length > mr->ibmr.length || iova - mr->ibmr.iova > mr->ibmr.length - length) With the fix, mr_check_range() returns -EINVAL for the crafted iova and the responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.38% (percentile 31)
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8700e3e7c4857d28ebaa824509934556da0b3e76 before b7d2118660545a00b21e83010ded1a231c6fb8c5; 8700e3e7c4857d28ebaa824509934556da0b3e76 builds before 5d9426a74fc8cb8f375fcdc19b465a030f9b8cab; 8700e3e7c4857d28ebaa824509934556da0b3e76 builds before 2f3b705144e3a3c14184fec6e354680081fe91ec; 8700e3e7c4857d28ebaa824509934556da0b3e76 builds before 3431f525718f6b07da308cda6d44f8cb548bbd37; from 8700e3e7c4857d28ebaa824509934556da0b3e76 before d10e2a08799e858d3e71ea4169bcd018f216d444 | CNA record |
References
- https://git.kernel.org/stable/c/b7d2118660545a00b21e83010ded1a231c6fb8c5
- https://git.kernel.org/stable/c/5d9426a74fc8cb8f375fcdc19b465a030f9b8cab
- https://git.kernel.org/stable/c/2f3b705144e3a3c14184fec6e354680081fe91ec
- https://git.kernel.org/stable/c/3431f525718f6b07da308cda6d44f8cb548bbd37
- https://git.kernel.org/stable/c/d10e2a08799e858d3e71ea4169bcd018f216d444
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.