Improper handling of exceptional conditions in Linux kernel - CVE-2026-98906

Vulnerability identifier: #VU157607

CSH Severity: Low

CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98906

CWE-ID: CWE-755

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to potentially cause kernel memory corruption and a denial of service.

The vulnerability exists due to incomplete restoration of receive state in the lan966x driver's lan966x_fdma_reload() function when receive-resource allocation fails during an MTU change. A local privileged user can trigger an MTU reload that encounters an allocation failure to leave receive processing using inconsistent page geometry and stale XDP receive-queue memory-model registrations, potentially causing kernel memory corruption and a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/3883898ddc26308497dbba8068951ab5eddbd111
• https://git.kernel.org/stable/c/aa97f11a76e545ed73cc455bcdd1ece4b480b507
• https://git.kernel.org/stable/c/b5a6462f4646687c922931133a2478da94addc87

• Improper handling of exceptional conditions in Linux kernel microchip lan966x driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more