SB20260824182 - Use-after-free in Linux kernel smc
Published: August 24, 2026
Security Bulletin ID
SB20260824182
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-74631)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
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