Integer overflow in Linux kernel - CVE-2026-64548

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an integer overflow leading to an out-of-bounds write in bpf_msg_push_data() when processing a crafted len value in the copy fallback path. A local user can supply a crafted len value to cause a denial of service.

Exploitation requires access to BPF-driven sockmap message processing and occurs when the scatterlist ring is full or nearly full.

Affected software

How to mitigate CVE-2026-64548

External References

• https://git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82
• https://git.kernel.org/stable/c/4e40056bb5c829f0423f0a6694a0477726d2147e
• https://git.kernel.org/stable/c/888706a76286c547bd035432602571e8024b5305
• https://git.kernel.org/stable/c/a12b1575f9feabd91695a9e9d004862f7195fa25
• https://git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab
• https://git.kernel.org/stable/c/db77b6bb6e6edb79b10b4efcce346eec5582d588
• https://git.kernel.org/stable/c/f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5
• https://git.kernel.org/stable/c/ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d

Related Security Bulletins

• Integer overflow in Linux kernel core
• Debian update for linux