Use-after-free in Linux kernel - CVE-2026-74631
Published: August 24, 2026
Vulnerability identifier: #VU144905
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-2026-74631
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 a use-after-free in smc_rx_splice when processing splice operations. A local user can trigger a refcount imbalance to cause a denial of service.
The issue can underflow page refcounts in the VM-backed RMB path.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74631
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090
- https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0
- https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d
- https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e
- https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb
- https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8
- https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b
- https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5