Use-after-free in Linux kernel - CVE-2026-45998
Published: May 28, 2026
Vulnerability identifier: #VU132490
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-2026-45998
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in rxrpc_input_packet() and rxrpc_io_thread() when handling RxRPC packets after skb_unshare() failure. A local user can trigger an allocation failure condition to cause a denial of service.
Affected software
Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
kernel (Red Hat package)
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
kernel (Red Hat package)
How to mitigate CVE-2026-45998
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - update to 6.12.0-211.30.1.el10_2
kernel (Red Hat package) - update to 6.12.0-211.30.1.el10_2
External References
- https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8
- https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd
- https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd
- https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495
- https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c