CVE-2026-72343
mlx5e driver zero-sized buffer bug can crash Linux kernel (DoS).
Is CVE-2026-72343 being exploited?
Not confirmed. CVE-2026-72343 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 0.19% probability of exploitation in the next 30 days.
How severe is CVE-2026-72343?
CVE-2026-72343 is rated High. 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-2026-72343?
Yes. A fix has been recorded for CVE-2026-72343. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72343 affect?
CVE-2026-72343 affects Linux kernel (mlx5e driver), Mellanox/ConnectX NICs, Virtualized HV VHCA environments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72343?
Install kernel patch that updates mlx5e driver and reboot affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Kernel oops/denial of service via memset on ZERO_SIZE_PTR when hypervisor enables mlx5e VHCA stats; may crash hosts or guests.
Patch when possible
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < 3b3a552cf88e10bb7bda88b29cf1fd8267043d50
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < 5b927dcec5f1087942bf123a82e64a3f66475f01
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < 22c1d5ecccf92c849bdca1556179aafc95794baf
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < 420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < abc4c56427f144c96b2827a4db3b90eb5b7349a2
- affected>= fa691d0c9c0812b9045f3a9420862e47b3b92518 and < 25f6b929c7e379cbea7cb8caa67b49b2d1efae17
- affected5.17
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.