Kernel-level overflow in svcrdma (RPC-over-RDMA) impacts Linux NFS/RDMA servers; high-severity, widespread kernel bug that can disrupt infrastructure and is newsworthy.
CVE-2026-89530
Linux kernel svcrdma overflow allowing remote kernel memory corruption
Is CVE-2026-89530 being exploited?
Not confirmed. CVE-2026-89530 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-89530?
CVE-2026-89530 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-89530?
Yes. A fix has been recorded for CVE-2026-89530. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-89530 affect?
CVE-2026-89530 affects Linux kernel (svcrdma/RPC-over-RDMA), NFS servers using RDMA, Linux distributions shipping affected kernel versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-89530?
Apply the kernel stable patch or distro kernel update immediately and reboot hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote kernel memory corruption via crafted RPC-over-RDMA reply; can cause panics, data corruption, or lead to remote code execution.
Immediate action required
- affected>= e248aa7be86e8179f20ac0931774ecd746f3f5bf and < fcd91b9957462d398792201c239dffaeff1cc8b2
- affected>= e248aa7be86e8179f20ac0931774ecd746f3f5bf and < 1949dd1576f7a8aa161b1330c6125df9d53046d5
- affected>= e248aa7be86e8179f20ac0931774ecd746f3f5bf and < 8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf
- affected>= e248aa7be86e8179f20ac0931774ecd746f3f5bf and < 0fbe20dfe74b783d255bf389a6ea77aa25dc7860
- affected9b65b18f817d9ada2bf67351f24bdcce6789a0bb
- affectedd564356e1919d1178568c19af410cfc1a9076663
- affected>= 4.19.22 and < 4.20
- affected>= 4.20.9 and < 4.21
- affected5.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.