CVE-2026-89691

CVE-2026-89691 affects the Linux kernel's nfsd (NFS server) component. The root cause is that nfsd4_release_compoundargs() resets args->ops to the inline 8-element iops[] array after freeing the dynamically allocated ops buffer, but fails to clear args->opcnt, which can be up to 200 for NFS...

PT-2026-90407

In the Linux kernel, the following vulnerability has been resolved: nfsd: clear opcnt on compound arg release to prevent OOB read nfsd4 release compoundargs resets args-ops to the inline iops8 array when the dynamically-allocated ops buffer is freed, but leaves args-opcnt at its original value...

USN-3655-1 linux vulnerabilities

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including kernel memor...

USN-3653-2 linux-hwe, linux-azure, linux-gcp, linux-oem vulnerabilities

USN-3653-1 fixed vulnerabilities and added mitigations in the Linux kernel for Ubuntu 17.10. This update provides the corresponding updates for the Linux Hardware Enablement HWE kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS. Jann Horn and Ken Johnson discovered that microprocessors utilizing...