Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-98560

Vulnerability identifier: #VU156864

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98560

CWE-ID: CWE-772

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to exhaust kernel resources and potentially cause a denial of service.

The vulnerability exists due to missing release of workqueue resources in the Linux kernel RDS connection handling code when an RDS/TCP connection to a local address is switched to the loopback transport. A local user can trigger creation of such connections followed by network namespace teardown or module unloading to leak seven workqueues per connection, potentially exhausting kernel resources and causing 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/670f303169d2d36f315c40f6d3d18b5ee8498fea
• https://git.kernel.org/stable/c/ba3d1f480c7a3fba963e7867ad6cc557c197acbc

• Missing Release of Resource after Effective Lifetime in Linux kernel rds
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more