High [CVE-2026-80863] Fix OOB in free_rd_atomic_resources
This high-severity Red Hat Linux advisory covers CVE-2026-80863 affecting Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel's RDMA/rxe component. A local user could exploit a memory corruption vulnerability in the `free_rd_atomic_resources()` function by updating the `max_dest_rd_atomic` value before the old array is properly freed, leading to an out-of-bounds write.
This issue can cause a system crash, resulting in a denial of service (DoS). An OOB write in RDMA/RXE free_rd_atomic_resources can occur because qp attr max_dest_rd_atomic is updated before the old rd atomic resources array is freed.
The free path then uses the new larger bound while walking the old smaller allocation, which can write past the kmalloc object and corrupt slab memory. The issue is not directly network reachable because the triggering operation is a local uverbs control path rather than inbound RDMA traffic.
Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7 as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, prevent module rdma_rxe from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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