Use-after-free in Linux kernel - CVE-2026-98592

Vulnerability identifier: #VU156895

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98592

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service through DMA accesses to stale buffer addresses.

The vulnerability exists due to use-after-free in the SpacemiT Ethernet driver's emac_tx_mem_map() function when handling a fragment mapping failure during packet transmission. A local user can trigger transmission of fragmented packets that encounter this failure to leave hardware-owned descriptors referencing released DMA mappings, potentially causing invalid memory accesses and a system crash.

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/2d14720beb58870b15a52b236c3ab0be0e06e915
• https://git.kernel.org/stable/c/3001a103a367c6051c43aff363b6979c10e65347
• https://git.kernel.org/stable/c/ca9986cc824f2feb79b4a83e5f6f4c24c2140448

• Use-after-free in Linux kernel ethernet spacemit driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more